CN112194394A - Preparation method of artificial building aggregate based on sludge - Google Patents
Preparation method of artificial building aggregate based on sludge Download PDFInfo
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- CN112194394A CN112194394A CN202010962421.8A CN202010962421A CN112194394A CN 112194394 A CN112194394 A CN 112194394A CN 202010962421 A CN202010962421 A CN 202010962421A CN 112194394 A CN112194394 A CN 112194394A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/021—Agglomerated materials, e.g. artificial aggregates agglomerated by a mineral binder, e.g. cement
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The application provides a preparation method of artificial building aggregate based on sludge, which comprises the following steps: providing sludge, and pretreating the sludge to obtain dry sludge powder; mixing the dry sludge powder with an inorganic binder, a mineral admixture and an excitant to obtain a first mixture, wherein the parts ratio of the dry sludge powder to the inorganic binder to the mineral admixture to the excitant is (50-90): (5-20): (1-30): (0.5 to 5); and mixing and granulating the first mixture and water to obtain the artificial building aggregate. The method takes the sludge as a main component, uses the inorganic binder to carry out crosslinking and solidify harmful components, ensures that the artificial building aggregate has enough mechanical strength and excellent properties, can carry out large-scale recycling on the sludge, and on the other hand, the artificial building aggregate can replace the exploitation of natural aggregate and can be widely applied to projects such as buildings and the like.
Description
Technical Field
The application belongs to the technical field of inorganic non-metallic materials, and particularly relates to a preparation method of sludge-based artificial building aggregate.
Background
In recent years, as urban population becomes more dense, land resources become more scarce, and environmental problems are brought about in that more and more rivers are artificially occupied and buried, and the number of urban rivers is rapidly reduced. Meanwhile, the increase of population also drives the rapid development of the urban industry, which causes more and more serious environmental pollution problems. City watercourses begin to play the role of natural refuse dumps, once clear water watercourses are forced to be changed into city drainage channels, and domestic sewage, industrial wastewater and various solid wastes are thrown into the watercourses. At present, about 90% of urban rivers in China are seriously polluted, and many cities gradually realize the problem and begin to control the pollution of the urban rivers. Since the pollution of river channel siltation is the most serious in the process of urban river and lake treatment, the treatment of river channel siltation becomes the central importance of the whole urban river channel treatment work. The 'ten items of water' stipulates that the disposal rate of harmless treatment of the municipal siltation of grade and above should reach more than 90% before the end of 2020. According to the investigation result, 70% of the siltation in China is not properly treated. Therefore, the high-efficiency resource comprehensive utilization of the large mixing amount of the sludge has important significance for the treatment of the sludge in China.
The aggregate is an important raw material in the infrastructure industry, is in a loose granular shape, is a basic raw material for preparing concrete, plays a role in skeleton and filling in the concrete, and can reduce the concrete shrinkage, inhibit crack expansion, reduce hydration heat, increase the wear resistance and the like. The existing aggregate mainly comprises gravel and sand formed by washing and screening natural gravel materials excavated in riverbeds, broken stone and artificial sand formed by blasting and exploiting lump stones, crushing, washing, screening and grinding, and the like, and along with the development of infrastructure, the demand of the aggregate is increased day by day, for example, the amount of the aggregate used for the highway gravel per kilometer is about 5.4-6 ten thousand tons. However, natural aggregate has limited mining resources, and a large amount of mountain and quarrying can seriously damage the landscape and green vegetation of the natural mountain, and large-scale river bed sand excavation easily changes the position and shape of the river bed, which leads to serious consequences such as water and soil loss or river diversion, and in order to protect the environment and reduce the resource mining pressure, people need to develop artificial aggregate to replace the natural aggregate.
Disclosure of Invention
The application aims to provide a preparation method of artificial building aggregate based on sludge, and aims to solve the problems that the sludge recovery treatment is troublesome and the mining pressure of natural aggregate is high in the prior art.
In order to achieve the purpose of the application, the technical scheme adopted by the application is as follows:
in a first aspect, the present application provides a method for preparing a sludge-based artificial building aggregate, comprising the steps of:
providing sludge, and pretreating the sludge to obtain dry sludge powder;
mixing the dry sludge powder with an inorganic binder, a mineral admixture and an excitant to obtain a first mixture, wherein the parts ratio of the dry sludge powder to the inorganic binder to the mineral admixture to the excitant is (50-90): (5-20): (1-30): (0.5 to 5);
and mixing and granulating the first mixture and water to obtain the artificial building aggregate.
In a second aspect, the present application provides an artificial building aggregate prepared by a method for preparing a sludge-based artificial building aggregate, the artificial building aggregate comprising the following components in parts by weight:
according to the preparation method of the sludge-based artificial building aggregate, sludge is used as a main raw material, and dried sludge powder is obtained through pretreatment and added, so that the water content of the sludge can be ensured to be low by providing the dried sludge powder, and the subsequent granulation treatment is facilitated; the inorganic binding agent and the exciting agent are compounded for use, under the action of the exciting agent, the inorganic binding agent and water are subjected to hydration reaction to form a gel network structure, the gel network structure mutually bonds dry sludge powder and gradually hardens to form a solid, the artificial aggregate is endowed with good mechanical property, natural aggregate can be effectively replaced, the exploitation pressure of the natural aggregate is reduced, and meanwhile, the gel network structure formed by the inorganic gel material through hydration reaction can also coat and solidify the sludge, so that harmful ingredients in the sludge are solidified in a solidified body of the sludge, the permeation and dissolution of the harmful ingredients are reduced, the secondary pollution of the harmful ingredients in the sludge to the environment is effectively avoided while the secondary utilization value of the sludge is realized, and the environment-friendly effect is achieved; furthermore, the mineral admixture is added in a synergistic manner to carry out granulation treatment together, so that the prepared artificial building aggregate has stronger mechanical property and compressive strength, the preparation method is simple and convenient, and convenient to operate, and on one hand, sludge can be recycled on a large scale to form the artificial building aggregate; on the other hand, the artificial building aggregate can achieve higher mechanical property and compressive strength, can replace the exploitation of natural aggregate, and is widely applied to projects such as buildings and the like.
The artificial aggregate provided by the second aspect is prepared by the preparation method of the artificial building aggregate based on the sludge, has good mechanical property and compressive strength, can effectively replace natural aggregate, reduces the mining pressure of the natural aggregate, and is widely applied to construction and other projects.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic view of an artificial building aggregate provided in example 1 of the present application.
FIG. 2 is a graph showing the 3-day single-grain compressive strength of the artificial building aggregates provided in examples 1 to 12 of the present application.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application more clearly apparent, the present application is further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In this application, the term "and/or" describes an association relationship of associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a is present alone, A and B are present simultaneously, and B is present alone. Wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
In the present application, "at least one" means one or more, "a plurality" means two or more. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, "at least one (a), b, or c", or "at least one (a), b, and c", may each represent: a, b, c, a-b (i.e., a and b), a-c, b-c, or a-b-c, wherein a, b, and c may be single or plural, respectively.
It should be understood that, in various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, some or all of the steps may be executed in parallel or executed sequentially, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The weight of the related components mentioned in the description of the embodiments of the present application may not only refer to the specific content of each component, but also represent the proportional relationship of the weight among the components, and therefore, the content of the related components is scaled up or down within the scope disclosed in the description of the embodiments of the present application as long as it is scaled up or down according to the description of the embodiments of the present application. Specifically, the mass described in the specification of the embodiments of the present application may be a mass unit known in the chemical industry field such as μ g, mg, g, kg, etc.
The terms "first" and "second" are used for descriptive purposes only and are used for distinguishing purposes such as substances from one another, and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. For example, a first XX may also be referred to as a second XX, and similarly, a second XX may also be referred to as a first XX, without departing from the scope of embodiments of the present application. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
The first aspect of the embodiment of the application provides a preparation method of artificial building aggregate based on sludge, which comprises the following steps:
s01, providing sludge, and pretreating the sludge to obtain dry sludge powder;
s02, mixing dry sludge powder with an inorganic adhesive, a mineral admixture and an excitant to obtain a first mixture, wherein the parts ratio of the dry sludge powder to the inorganic adhesive to the mineral admixture to the excitant is (50-90): (5-20): (1-30): (0.5 to 5);
and S03, mixing and granulating the first mixture and water to obtain the artificial building aggregate.
According to the preparation method of the sludge-based artificial building aggregate, the dried sludge powder obtained through pretreatment is used as a main raw material and is compounded with an inorganic adhesive and an activator, under the action of the activator, the inorganic adhesive and water are subjected to hydration reaction to form a gel network structure, the dry sludge powder is mutually bonded and gradually hardened to form a solid through the gel network structure, and the sludge is coated and solidified, so that harmful components in the sludge are solidified, the permeation and dissolution of the harmful components are reduced, the secondary pollution of the harmful components in the riverway siltation to the environment is effectively avoided while the secondary utilization value of the riverway siltation is realized, and the preparation method is green and environment-friendly; furthermore, the mineral admixture is added in a synergistic manner to carry out granulation together, so that the prepared artificial building aggregate has stronger mechanical property and compressive strength.
In step S01, sludge is provided, which is mainly industrial and domestic garbage sediment accumulated in the river, and can be sediment in the river in our country and even in the region of the world, or sediment at the bottom of water environment such as ocean and lake.
Specifically, the sludge is pretreated to obtain dry sludge powder, and the dry sludge powder is provided for granulation treatment, so that excessive moisture is not contained in sludge components, and direct granulation is guaranteed.
Preferably, the step of pretreating the sludge to obtain a dried sludge powder comprises: drying the sludge at the temperature of 60-80 ℃ or under the sun irradiation condition, and then carrying out ball milling treatment to obtain dry sludge powder. Further preferably, the time of the ball milling treatment is 0.5 to 5 minutes. Under the conditions of proper temperature and ball milling treatment time, the sludge powder obtained by treatment contains no water or has extremely low water content, and the particle size is ensured to be moderate, thereby being beneficial to carrying out subsequent reaction.
In some embodiments, the sludge is dried at a temperature of 60 ℃ to 80 ℃ and then ball-milled for 0.5 to 5 minutes to obtain dried sludge powder, wherein the water content of the obtained dried sludge powder is 0.
Preferably, the median diameter of the dried sludge powder is 1-40 microns. The median particle size of the riverway siltation is controlled to be 1-40 micrometers, so that the particle size of the dry sludge powder is moderate, the dry sludge powder is promoted to be coated into a gel network structure formed by an inorganic bonding material through hydration reaction to the maximum extent, the artificial building aggregate is endowed with good mechanical strength, and the solidification effect of harmful ingredients in the dry sludge powder is ensured. When the particle size of the dried sludge powder is too large, the hydration reaction is unbalanced, so that the formed gel network is too sparse, the mechanical strength and the pressure resistance of the artificial aggregate cannot be ensured, and the curing effect of harmful components in the dried sludge powder is influenced to a certain degree; when the particle size of the dried sludge powder is too small, agglomeration is easy to occur in the reaction process, which is not favorable for preparing the artificial aggregate with good mechanical property.
In step S02, the dried sludge powder is mixed with an inorganic binder, a mineral admixture and an activator to obtain a first mixture.
Preferably, in the step of mixing the dry sludge powder with the inorganic binder, the mineral admixture and the excitant, the dry sludge powder, the inorganic binder, the mineral admixture and the excitant are mixed for 1-5 minutes under the condition of 80-100 revolutions per minute, the rotating speed and the mixing time in the mixing treatment process are controlled, the components are uniformly mixed, the formed gel network structure can fully wrap the dry sludge powder, and the obtained artificial building aggregate has good mechanical strength.
Specifically, the parts ratio of the dry sludge powder, the inorganic adhesive, the mineral admixture and the excitant is (50-90): (5-20): (1-30): (0.5-5). The adding amount of the dried sludge powder is 50-90 parts, so that the recycling of the efficientroute of the sludge is greatly improved, the stacking space and the recycling pressure of the sludge are reduced, and a new treatment method is provided for preventing and treating the sludge. In a specific embodiment of the invention, the added parts of the dried sludge powder are selected from 50 parts, 53 parts, 55 parts, 60 parts, 64 parts, 69 parts, 73 parts, 79 parts, 83 parts, 88 parts, 90 parts.
Further, on the basis of taking the sludge as a main component, the sludge also comprises an inorganic binder and an excitant; by adding the inorganic adhesive and the excitant, under the action of the excitant, the inorganic adhesive forms a gel structure through hydration reaction, the sludge is firmly bonded together, harmful ingredients in the sludge are fully cured and gradually hardened to form a cured body, and a large amount of sludge can be bonded by using a small amount of inorganic cementing materials to prepare the artificial building aggregate. The excitant is mainly used for exciting the inorganic adhesive to generate hydration reaction with water so as to form a structure with a gel network, so that the crosslinking performance in the inorganic adhesive is enhanced, and the compressive strength of the mechanical strength of the inorganic adhesive is improved.
Specifically, the parts ratio of the dry sludge powder, the inorganic adhesive, the mineral admixture and the excitant is (50-90): (5-20): (1-30): (0.5-5). Preferably, the addition part of the inorganic binder is 5-20 parts on the basis of 50-90 parts of the sludge. According to the invention, a small amount of inorganic binder and a large amount of main components of sludge are compounded for use, under the action of a small amount of excitant, the inorganic binder can form a gel structure through hydration reaction, the sludge is firmly bonded together, and harmful components in the sludge are fully cured and gradually hardened to form a cured body, so that the purpose of using a small amount of inorganic cementing materials to bond a large amount of sludge to prepare the artificial building aggregate is achieved. If the adding amount of the inorganic cementing material is excessive, the waste of the inorganic cementing material is caused, and the normal use of the artificial building aggregate is influenced; if the addition amount of the inorganic cementing material is too small, the crosslinking effect of the sludge is affected, and the artificial building aggregate cannot be formed.
In the embodiment of the present invention, the addition part of the inorganic binder is selected from 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts and 20 parts.
Preferably, the inorganic binder is at least one selected from the group consisting of portland cement, phosphate cement, and geopolymer cement. In the preferred embodiment of the invention, the inorganic binder is selected from geopolymer cement, the geopolymer cement is prepared by taking aluminum-silicon phase solid wastes and a chemical activator as raw materials through proper process treatment and chemical reaction, more specifically, the geopolymer cement is taken as an inorganic polymeric material with a three-dimensional oxide network framework structure formed by covalently connecting Si, O, Al and the like, and is compounded with sludge for use, so that the geopolymer cement has good curing effect on harmful components in the sludge, has high gelling and hardening speed and high polymerization degree, and obviously improves the curing effect on the harmful components and ensures that the artificial building aggregate has good mechanical property in the preparation process of the artificial building aggregate.
Specifically, the parts ratio of the dry sludge powder, the inorganic adhesive, the mineral admixture and the excitant is (50-90): (5-20): (1-30): (0.5-5). Preferably, the addition part of the exciting agent is 0.5-5 parts on the basis of 50-90 parts of the sludge and 5-20 parts of the inorganic binder. The addition of the excitant in the parts can ensure that the inorganic adhesive has rapid and complete hydration reaction to form A product with A C- (A) -S-H gel structure or an S-A-P-H/S-A-H gel structure, so that A 'network structure' is formed in the inorganic adhesive, the crosslinking performance of the inorganic adhesive is enhanced, and the wrapping and curing effects on sludge are improved. If the addition amount of the exciting agent is less, the hydration reaction is incomplete, and the strength of the artificial building aggregate is low; if the addition amount is too much, excessive precipitation can occur, and the cost is too high, so that the large-scale production is not facilitated.
In the embodiment of the invention, the addition part of the exciting agent is selected from 0.5 part, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts and 5 parts.
Preferably, the activator is at least one selected from the group consisting of sulfuric acid, carbonic acid, phosphoric acid, sodium hydroxide, calcium hydroxide, sodium chloride, sodium carbonate, sodium silicate, sodium sulfate, sodium phosphate, aluminum dihydrogen phosphate, sodium methoxide, and sodium ethoxide. The excitant contains acid radical ions such as sulfate ions, carbonate ions and phosphate ions or hydroxyl ions, and under the action of the excitant containing the ions, the mineral admixture is promoted to be combined with water to generate hydration reaction to form a gel network structure, so that the crosslinking performance of the aggregate is enhanced, and the compressive strength of the mechanical strength of the aggregate is improved.
Further preferably, the activator is selected from any one of a combination of sodium hydroxide and sodium silicate, a combination of calcium hydroxide and sodium sulfate, and a combination of phosphoric acid and aluminum dihydrogen phosphate. In some embodiments, a composition of sodium hydroxide and sodium silicate is used as an activator, wherein the sodium hydroxide is a strong alkaline substance, the sodium silicate is a soluble inorganic silicate and has high viscosity, a mixed system of the inorganic silicate and the strong alkaline substance is used as the activator, and multiple anions act together to improve the rate of hydration reaction and the crosslinking performance between riverway silts, so that the aggregate has stronger mechanical strength. In other embodiments, a composition of calcium hydroxide and sodium sulfate is used as an activator, strong base and salt with sulfate radical are used as activators, hydration products are promoted to be generated more quickly, so that the formation of a gel network structure is accelerated, and the mechanical strength of the aggregate is improved. In other embodiments, a combination of phosphoric acid and aluminum dihydrogen phosphate is used as an activator, wherein the phosphoric acid is a ternary medium-strong acid, is not easy to volatilize and decompose, and has certain oxidizability and acid universality; the aluminum dihydrogen phosphate is an inorganic metal salt with viscosity, and can reduce the viscosity of the aluminum dihydrogen phosphate when being mixed with phosphoric acid, so that the hydration speed is improved, and the mechanical strength of the aggregate is improved.
Further, on the basis of taking the sludge as a main component, the sludge-containing sewage treatment agent also comprises a mineral admixture; by adding the mineral admixture, the artificial building aggregate with different density grades can be prepared according to requirements, and the mechanical property and compressive strength of the artificial building aggregate are improved.
Specifically, the parts ratio of the dry sludge powder, the inorganic adhesive, the mineral admixture and the excitant is (50-90): (5-20): (1-30): (0.5-5). Preferably, the addition part of the mineral admixture is 1-30 parts on the basis of 50-90 parts of the sludge, 5-20 parts of the inorganic binder and 0.5-5 parts of the excitant. If the addition amount is excessive, the addition and the use of the main component sludge are influenced, and the artificial building aggregate is not formed.
In the embodiment of the invention, the addition parts of the mineral admixture are selected from 1 part, 3 parts, 5 parts, 7 parts, 10 parts, 12 parts, 15 parts, 18 parts, 20 parts, 23 parts, 26 parts, 28 parts and 30 parts.
Preferably, the mineral admixture is an inorganic mineral fine powder mainly composed of one or more oxides of silicon, aluminum, calcium, etc., and the specific kind thereof is determined by the conventional technique in the art, and in some embodiments, the mineral admixture includes at least one of fly ash, silica fume, diatomaceous earth, slag, calcined shale, metakaolin, zeolite, siliceous shale, volcanic ash, lime powder, and tuff. In a further embodiment, the mineral admixture has a content of at least one oxide of calcium, aluminium and silicon of greater than 70%.
In step S03, the artificial building aggregate is obtained by mixing and granulating the first mixture with water, and the granulation treatment can be preferably performed by mixing the water with the first mixture.
The specific operation of subjecting the mixture and water to the granulation treatment can be carried out by referring to the conventional techniques in the art, and in some examples, the water is added slowly to the mixture (for example, in the form of water spray) to achieve mixed granulation, specifically, the mixture is fed into a granulator, and the water is added slowly during the granulation. Preferably, in the step of mixing and granulating the first mixture and water, the first mixture and water are granulated at 50-55 rpm for 5-10 minutes, and the rotation speed of the mixing and granulating treatment and the time of the granulating treatment are controlled, so that the granulating effect is improved, and the artificial building aggregate with high strength is obtained.
Preferably, the part ratio of the first mixture to the water is (56.5-135): (15-55), in some embodiments, on the basis that the adding parts of the sludge are 50-90 parts, the adding parts of the inorganic binder are 5-20 parts, the adding parts of the excitant are 0.5-5 parts, and the adding parts of the mineral admixture are 1-30 parts, the adding parts of the water are 15-55 parts, and the adding parts of the water are controlled to ensure that the obtained artificial building aggregate is moderate in strength and good in compressive strength.
Preferably, the preparation method further comprises: the artificial building aggregate is sequentially subjected to maintenance treatment and carbonization treatment.
In some embodiments, the step of performing a curing process comprises: the artificial building aggregate is maintained for 7-8 days under the conditions that the temperature is 18-25 ℃ and the relative humidity is 90-100%, so that the inorganic adhesive in the prepared artificial building aggregate is fully hydrated, the hardening of the artificial building aggregate is accelerated, abnormal shrinkage cracks caused by drying of the artificial building aggregate due to natural influences such as wind, sunshine and the like are prevented, and the good mechanical property of the artificial building aggregate is ensured.
In some embodiments, the step of carbonizing comprises: and carbonizing the maintained artificial building aggregate in a carbonization box of carbon dioxide gas with the volume concentration of 20-100% for 1-48 hours. The inorganic adhesive can generate a large amount of calcium hydroxide after reacting with water, so that the pH value of the artificial building aggregate is alkaline, and the carbon dioxide gas and the calcium hydroxide are subjected to neutralization reaction through carbonization treatment, so that the pH value of the artificial building aggregate is reduced and tends to be neutral, and the wide application is facilitated.
In a second aspect, the artificial building aggregate prepared by the above method for preparing a sludge-based artificial building aggregate comprises the following components in parts by weight:
the artificial aggregate provided by the second aspect is prepared by the preparation method of the artificial building aggregate based on the sludge, has good mechanical property and compressive strength, can effectively replace natural aggregate, reduces the mining pressure of the natural aggregate, and is widely applied to construction and other projects.
Preferably, the artificial building aggregate is spherical particles, and the particle size of the spherical particles is 500-10 mm, so that the artificial building aggregate has smaller and uniform particle size and is beneficial to subsequent use.
The following description will be given with reference to specific examples.
Example 1
Preparation method of artificial building aggregate based on sludge
The preparation method comprises the following steps:
(1) providing sludge, drying the sludge at the temperature of 60-80 ℃, and performing ball milling treatment for 2 minutes to obtain dried sludge powder;
(2) mixing dry sludge powder with an inorganic adhesive, a mineral admixture and an excitant for 3 minutes under the condition of 80 revolutions per minute to obtain a first mixture, wherein the adding part of the dry sludge powder is 90 parts, the adding part of the inorganic adhesive is 5 parts, the adding part of the mineral admixture is 4 parts and the adding part of the excitant is 1 part; the silt is selected from silt in the Guangdong area, the inorganic binder is selected from geopolymer cement, the mineral admixture is selected from fly ash, and the excitant is selected from a composition of sodium hydroxide and sodium silicate;
(3) and granulating the first mixture and water at 50 revolutions per minute for 5 minutes to obtain a crude artificial building aggregate, wherein the adding part of the water is 15 parts.
(4) The crude artificial building aggregate was cured at a temperature of 18 ℃ and a relative humidity of 90% for 7 days.
(5) And carbonizing the crude artificial building aggregate after the curing treatment in a carbonization box of carbon dioxide gas with the volume concentration of 20% for 3 days to obtain the artificial building aggregate.
Example 2
Compared with example 1, the difference is that: and (3) modifying the step (5) that the crude artificial building aggregate after the maintenance treatment is carbonized in a carbonization box of carbon dioxide gas with the volume concentration of 20% for 3 days into a step (that the crude artificial building aggregate after the maintenance treatment is carbonized in a carbonization box of carbon dioxide gas with the volume concentration of 20% for 24 hours), and preparing the artificial building aggregate by the same other steps.
Example 3
Compared with example 1, the difference is that: and (3) modifying the step (5) that the crude artificial building aggregate after the maintenance treatment is carbonized in a carbonization box of carbon dioxide gas with the volume concentration of 20% for 3 days into a step (that the crude artificial building aggregate after the maintenance treatment is carbonized in a carbonization box of carbon dioxide gas with the volume concentration of 100% for 1.5 hours), and preparing the artificial building aggregate by the same other steps.
Example 4
Preparation method of artificial building aggregate based on sludge
The preparation method comprises the following steps:
(1) providing sludge, drying the sludge at the temperature of 60-80 ℃, and performing ball milling treatment for 2 minutes to obtain dried sludge powder;
(2) mixing dry sludge powder with an inorganic adhesive, a mineral admixture and an excitant for 4 minutes under the condition of 85 revolutions per minute to obtain a first mixture, wherein the addition part of the dry sludge powder is 85 parts, the addition part of the inorganic adhesive is 10 parts, the addition part of the mineral admixture is 4 parts and the addition part of the excitant is 1 part; the silt is selected from silt in the Guangdong area, the inorganic binder is selected from geopolymer cement, the mineral admixture is selected from fly ash, and the excitant is selected from a composition of sodium hydroxide and sodium silicate;
(3) and granulating the first mixture and water at 51 revolutions per minute for 6 minutes to obtain crude artificial building aggregate, wherein the adding part of the water is 20 parts.
(4) The crude artificial building aggregate was cured at a temperature of 18 ℃ and a relative humidity of 90% for 7 days.
(5) And carbonizing the crude artificial building aggregate after the curing treatment in a carbonization box of carbon dioxide gas with the volume concentration of 20% for 3 days to obtain the artificial building aggregate.
Example 5
Compared with example 4, the difference is that: and (3) modifying the step (5) that the crude artificial building aggregate after the maintenance treatment is carbonized in a carbonization box of carbon dioxide gas with the volume concentration of 20% for 3 days into a step (that the crude artificial building aggregate after the maintenance treatment is carbonized in a carbonization box of carbon dioxide gas with the volume concentration of 20% for 24 hours), and preparing the artificial building aggregate by the same other steps.
Example 6
Compared with example 4, the difference is that: and (3) modifying the step (5) that the crude artificial building aggregate after the maintenance treatment is carbonized in a carbonization box of carbon dioxide gas with the volume concentration of 20% for 3 days into a step (that the crude artificial building aggregate after the maintenance treatment is carbonized in a carbonization box of carbon dioxide gas with the volume concentration of 100% for 1.5 hours), and preparing the artificial building aggregate by the same other steps.
Example 7
Preparation method of artificial building aggregate based on sludge
The preparation method comprises the following steps:
(1) providing sludge, drying the sludge at the temperature of 60-80 ℃, and performing ball milling treatment for 2 minutes to obtain dried sludge powder;
(2) mixing dry sludge powder with an inorganic adhesive, a mineral admixture and an exciting agent for 3 minutes under the condition of 90 revolutions per minute to obtain a first mixture, wherein the adding part of the dry sludge powder is 80 parts, the adding part of the inorganic adhesive is 15 parts, the adding part of the mineral admixture is 4 parts and the adding part of the exciting agent is 1 part; the silt is selected from silt in the Guangdong area, the inorganic binder is selected from geopolymer cement, the mineral admixture is selected from fly ash, and the excitant is selected from a composition of sodium hydroxide and sodium silicate;
(3) and granulating the first mixture and water at 51 revolutions per minute for 6 minutes to obtain crude artificial building aggregate, wherein the adding part of the water is 25 parts.
(4) The crude artificial building aggregate was cured at a temperature of 18 ℃ and a relative humidity of 90% for 7 days.
(5) And carbonizing the crude artificial building aggregate after the curing treatment in a carbonization box of carbon dioxide gas with the volume concentration of 20% for 3 days to obtain the artificial building aggregate.
Example 8
Compared with example 7, the difference is that: and (3) modifying the step (5) that the crude artificial building aggregate after the maintenance treatment is carbonized in a carbonization box of carbon dioxide gas with the volume concentration of 20% for 3 days into a step (that the crude artificial building aggregate after the maintenance treatment is carbonized in a carbonization box of carbon dioxide gas with the volume concentration of 20% for 24 hours), and preparing the artificial building aggregate by the same other steps.
Example 9
Compared with example 7, the difference is that: and (3) modifying the step (5) that the crude artificial building aggregate after the maintenance treatment is carbonized in a carbonization box of carbon dioxide gas with the volume concentration of 20% for 3 days into a step (that the crude artificial building aggregate after the maintenance treatment is carbonized in a carbonization box of carbon dioxide gas with the volume concentration of 100% for 1.5 hours), and preparing the artificial building aggregate by the same other steps.
Example 10
Preparation method of artificial building aggregate based on sludge
The preparation method comprises the following steps:
(1) providing sludge, drying the sludge at the temperature of 60-80 ℃, and performing ball milling treatment for 2 minutes to obtain dried sludge powder;
(2) mixing dry sludge powder with an inorganic adhesive, a mineral admixture and an excitant for 4 minutes under the condition of 85 revolutions per minute to obtain a first mixture, wherein the addition part of the dry sludge powder is 70 parts, the addition part of the inorganic adhesive is 20 parts, the addition part of the mineral admixture is 5 parts and the addition part of the excitant is 1 part; the silt is selected from silt in the Guangdong area, the inorganic binder is selected from geopolymer cement, the mineral admixture is selected from fly ash, and the excitant is selected from a composition of sodium hydroxide and sodium silicate;
(3) and granulating the first mixture and water at 51 revolutions per minute for 6 minutes to obtain crude artificial building aggregate, wherein the adding part of the water is 30 parts.
(4) The crude artificial building aggregate was cured at a temperature of 18 ℃ and a relative humidity of 90% for 7 days.
(5) And carbonizing the crude artificial building aggregate after the curing treatment in a carbonization box of carbon dioxide gas with the volume concentration of 20% for 3 days to obtain the artificial building aggregate.
Example 11
Compared with example 10, the difference is that: and (3) modifying the step (5) that the crude artificial building aggregate after the maintenance treatment is carbonized in a carbonization box of carbon dioxide gas with the volume concentration of 20% for 3 days into a step (that the crude artificial building aggregate after the maintenance treatment is carbonized in a carbonization box of carbon dioxide gas with the volume concentration of 20% for 24 hours), and preparing the artificial building aggregate by the same other steps.
Example 12
Compared with example 10, the difference is that: and (3) modifying the step (5) that the crude artificial building aggregate after the maintenance treatment is carbonized in a carbonization box of carbon dioxide gas with the volume concentration of 20% for 3 days into a step (that the crude artificial building aggregate after the maintenance treatment is carbonized in a carbonization box of carbon dioxide gas with the volume concentration of 100% for 1.5 hours), and preparing the artificial building aggregate by the same other steps.
And (4) analyzing results:
results analysis (I)
The artificial aggregate prepared in example 1 was taken, the surface shape thereof was observed and the particle size thereof was measured, and as shown in the results of fig. 1, the artificial aggregate prepared in example 1 was spherical particles and had a particle size of 10mm or less.
Results analysis (two)
The artificial building aggregate provided by the embodiment 1-12 is subjected to mechanical property test, the single-grain compressive strength of the artificial building aggregate is 0.5-25MPa, and the artificial building aggregate can be applied to medium and low strength concrete structures instead of natural aggregate.
Results analysis (two)
The artificial building aggregates provided in examples 1 to 12 were subjected to a 3-day single-grain compressive strength test, and the results are shown in fig. 2, and it can be seen that the compressive strength of the prepared artificial building aggregates was stronger as the addition amount of the inorganic binder was larger, whereas the compressive strength of the artificial building aggregates obtained by carbonizing in a carbonization chamber for 1.5 hours using carbon dioxide gas having a volume concentration of 100% was stronger in the maintenance treatment when the addition amounts of the respective components were consistent.
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.
Claims (10)
1. A preparation method of artificial building aggregate based on sludge is characterized by comprising the following steps:
providing sludge, and pretreating the sludge to obtain dry sludge powder;
mixing the dry sludge powder with an inorganic binder, a mineral admixture and an excitant to obtain a first mixture, wherein the parts ratio of the dry sludge powder to the inorganic binder to the mineral admixture to the excitant is (50-90): (5-20): (1-30): (0.5 to 5);
and mixing and granulating the first mixture and water to obtain the artificial building aggregate.
2. The method for preparing sludge-based artificial building aggregate according to claim 1, wherein in the step of mixing the dry sludge powder with the inorganic binder, the mineral admixture and the excitant, the dry sludge powder is mixed with the inorganic binder, the mineral admixture and the excitant at 80-100 rpm for 1-5 minutes; and/or the presence of a gas in the gas,
and in the step of mixing and granulating the first mixture and water, granulating the first mixture and water at 50-55 rpm for 5-10 minutes.
3. The method for preparing sludge-based artificial building aggregate according to claim 1, wherein the part ratio of the first mixture to the water is (56.5-135): (15-55).
4. The method for preparing sludge-based artificial building aggregate according to claim 1, wherein the step of pretreating the sludge to obtain a dry sludge powder comprises: and drying the sludge at the temperature of 60-80 ℃ or under the sun irradiation condition, and then performing ball milling treatment to obtain the dry sludge powder.
5. The method for preparing sludge-based artificial building aggregate according to any one of claims 1 to 4, wherein the method further comprises: and sequentially carrying out maintenance treatment and carbonization treatment on the artificial building aggregate.
6. The method for preparing sludge-based artificial building aggregate according to any one of claims 1 to 4, wherein the dry sludge powder has a median diameter of 1 to 40 μm.
7. The method for preparing sludge-based artificial building aggregate according to any one of claims 1 to 4, wherein the inorganic binder is at least one selected from the group consisting of portland cement, geopolymer cement, and phosphate cement; and/or the presence of a gas in the gas,
the activator is at least one selected from sulfuric acid, carbonic acid, phosphoric acid, sodium hydroxide, calcium hydroxide, sodium chloride, sodium carbonate, sodium silicate, sodium sulfate, sodium phosphate, aluminum dihydrogen phosphate, sodium methoxide and sodium ethoxide.
8. The method for preparing artificial sludge-based building aggregate according to any one of claims 1 to 4, wherein the mineral admixture is at least one selected from the group consisting of fly ash, silica fume, diatomaceous earth, slag, calcined shale, metakaolin, zeolite, siliceous shale, volcanic ash, lime powder and tuff.
9. An artificial building aggregate prepared by the method for preparing the artificial building aggregate based on the sludge according to any one of claims 1 to 8, wherein the artificial building aggregate comprises the following components in parts by weight:
10. the artificial building aggregate according to claim 9, wherein the artificial building aggregate is spherical particles, and the particle size of the spherical particles is 500 μm to 10 mm.
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