CN115557719B - Comprehensive treatment method of phosphogypsum - Google Patents
Comprehensive treatment method of phosphogypsum Download PDFInfo
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- CN115557719B CN115557719B CN202210980036.5A CN202210980036A CN115557719B CN 115557719 B CN115557719 B CN 115557719B CN 202210980036 A CN202210980036 A CN 202210980036A CN 115557719 B CN115557719 B CN 115557719B
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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
- C04B11/00—Calcium sulfate cements
- C04B11/26—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke
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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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
- C04B22/14—Acids or salts thereof containing sulfur in the anion, e.g. sulfides
- C04B22/142—Sulfates
- C04B22/143—Calcium-sulfate
- C04B22/144—Phosphogypsum
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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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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
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Abstract
The invention discloses a comprehensive treatment method of phosphogypsum, and belongs to the technical field of wet-process phosphoric acid. The method comprises the following steps: (1) Collecting phosphogypsum, concentrating by a thickener, and delivering slurry obtained by concentration to a first-stage belt filter for treatment; (2) Filtering the mud of the first-stage belt filter, and conveying filter residues to the step (3) for treatment; (3) Reslurrying the filter residue, reslurry water and lime milk to obtain phosphogypsum slurry, wherein the reslurry water comprises filter pressing filtrate and secondary filtering washing drainage; (4) Filtering phosphogypsum slurry by a secondary belt filter, and combining filtrate of the secondary belt filter with water washing drainage to serve as secondary filtering washing drainage; in the step (2), collecting a washing water of the first-stage belt filter, and obtaining filter-pressing filtrate after gas-liquid separation, lime milk neutralization and filter-pressing; collecting secondary washing water, and separating gas from liquid to obtain primary washing water; collecting three washing water, and separating gas from liquid to obtain two washing water; the three washing water comprises filter pressing filtrate and secondary filtering washing drainage.
Description
Technical Field
The invention belongs to the technical field of wet-process phosphoric acid, and particularly relates to a comprehensive treatment method of phosphogypsum, wherein the treated phosphogypsum can be used as a building raw material or a cement coagulant.
Background
Phosphogypsum is an industrial byproduct gypsum generated during the production of high-concentration phosphorus compound fertilizer, and the main component is calcium sulfate dihydrate (CaSO) 4 ·2H 2 O) to obtain 1 ton of phosphoric acid (100% P 2 O 5 Meter) generates 4.8-5.0 tons of phosphogypsum, and the phosphogypsum needs to be treated in time if the solid waste pressure is very large. At present, phosphogypsum stacking of domestic manufacturers generally adopts two methods of wet discharging and dry discharging.
Wet stack: the filtering station of the phosphoric acid device adopts a wet method to remove slag, firstly, phosphogypsum is mixed with water to prepare phosphogypsum slag slurry with water content of 70-80%, then, the phosphogypsum slag slurry is pumped to a phosphogypsum tailing pond by adopting one-stage or multi-stage pump according to the distance of the conveying distance, and the clear water after natural sedimentation is pumped to the phosphoric acid device for repeated use. The method is generally adopted in domestic large wet-process phosphoric acid devices. The method has the advantages of high recovery and utilization rate of wastewater and phosphoric acid, environmental protection, energy conservation, convenient operation, low running cost and the like.
Dry drain stack: the dry discharge and dry piling process is the phosphogypsum piling mode which is earliest applied to the wet phosphoric acid production. The filtering station of the phosphoric acid device adopts dry deslagging, phosphogypsum with water content below 20% is conveyed to a phosphogypsum warehouse by a belt conveyor, and then an automobile or a belt conveyor is transported to an off-site slag field.
In the prior art, phosphogypsum is treated by adopting a filter press, the treatment capacity is very limited, and the phosphogypsum is required to be provided with a large number of filter presses for the yield of megaton phosphoric acid of the company and cannot be basically realized. In addition, the total phosphorus content of phosphogypsum can not be reduced basically only by filter pressing treatment, so that the waste of phosphorus elements is caused, and the utilization of phosphogypsum is not utilized. Only the phosphogypsum treated by dry discharge has high phosphorus content and very low pH value, and also contains more other impurities, which are not received by cement factories, building material manufacturers and the like, thus limiting the utilization way of the phosphogypsum.
Disclosure of Invention
In order to solve the problems, the embodiment of the invention provides a comprehensive treatment method of phosphogypsum, which adopts a two-stage belt filter for treatment, so that the moisture content is less than or equal to 20%, the total phosphorus is less than or equal to 1%, and the pH value is 6-8; the wastewater generated in the process is utilized in different modes, so that the phosphorus yield is improved, the wastewater discharge is reduced, and the use of water is reduced. The technical scheme is as follows:
the embodiment of the invention provides a comprehensive treatment method of phosphogypsum, which comprises the following steps:
(1) Collecting phosphogypsum, concentrating by a thickener, taking clear liquid obtained by concentration as phosphogypsum backwater, and delivering slurry obtained by concentration to a first-stage belt filter for treatment;
(2) The first-stage belt filter filters the slurry obtained in the step (1), the filtrate is taken as phosphogypsum backwater, and filter residues are sent to the step (3) for treatment;
(3) Reslurrying the filter residue obtained in the step (2), reslurrying water and quicklime or lime milk to obtain phosphogypsum slurry, wherein the reslurrying water comprises filter pressing filtrate and secondary filtering washing drainage;
(4) Filtering phosphogypsum slurry obtained in the step (3) by a secondary belt filter, combining filtrate, primary washing drainage, secondary washing drainage and tertiary washing drainage of the secondary belt filter as secondary filtering washing drainage, wherein filter residues are dry gypsum;
in the steps (2) and (4), after filtration, respectively carrying out primary washing, secondary washing and tertiary washing through primary washing water, secondary washing water and tertiary washing water in sequence;
in the step (2), collecting a washing water of the first-stage belt filter, and obtaining filter-pressing filtrate after gas-liquid separation, adding quicklime or lime milk for neutralization and filter-pressing; collecting secondary washing water, and separating gas from liquid to obtain primary washing water; collecting three washing water, and separating gas from liquid to obtain two washing water; the third washing water comprises filter-pressing filtrate and secondary filter-washing drainage;
in the step (4), clean water is used as the primary washing water, the secondary washing water and the tertiary washing water.
Wherein in the step (1), the thickener concentrates the phosphogypsum to a density of 1.3-1.4g/mL.
Wherein in the step (2), quicklime or lime milk is added into a washing wastewater to adjust the pH value to 7-8.
Further, in the step (2), after three-stage washing, the filter belt is washed by adopting one-stage washing water, the one-stage washing drainage is collected, the one-stage washing drainage is settled, clear liquid is used as one-stage washing water, and mud is sent to a feed inlet of the one-stage belt filter. In the step (4), the filter belt is washed by adopting secondary washing water after three-washing, secondary washing drainage is collected, sedimentation is carried out on the secondary washing drainage, clear liquid is used as secondary washing water, and mud is sent to a feed inlet of the secondary belt filter.
Wherein in the steps (2) and (4), the primary washing water, the secondary washing water and the tertiary washing water are heated to 50 ℃ and above.
Preferably, condensed water in the concentration of ammonium phosphate is recovered, hot water is obtained by heating or not heating the condensed water by steam, and the hot water is mixed with primary washing water, secondary washing water, tertiary washing water, primary washing water and secondary washing water.
Wherein in step (3), the pH value of the phosphogypsum slurry is adjusted to 6-8, and the density is adjusted to 1.3-1.4g/mL.
Further, in the steps (2) and (4), after gas-liquid separation, the gas is condensed through a condenser, a cooling tower and the condenser form a circulating cooling system, and the filter pressing filtrate is used as water supplement of the circulating cooling system.
Preferably, in steps (2) and (4) lime milk is used, which is configured from quicklime and press filtrate.
Specifically, the comprehensive treatment method of phosphogypsum provided by the embodiment of the invention comprises the following steps:
(1) Collecting phosphogypsum, concentrating the density of the phosphogypsum to 1.3-1.4g/mL through a thickener, taking the clear liquid obtained by concentration as phosphogypsum backwater, and conveying the slurry obtained by concentration to a first-stage belt filter for treatment;
(2) The first-stage belt filter filters the slurry obtained in the step (1), the filtrate is taken as phosphogypsum backwater, and filter residues are sent to the step (3) for treatment;
(3) Reslurrying the filter residue, reslurry water and lime milk obtained in the step (2) to obtain phosphogypsum slurry with the pH value of 6-8 and the density of 1.3-1.4g/mL, wherein the reslurry water comprises filter pressing filtrate and secondary filtering washing drainage;
(4) Filtering phosphogypsum slurry obtained in the step (3) by a secondary belt filter, combining filtrate, primary washing drainage, secondary washing drainage and tertiary washing drainage of the secondary belt filter as secondary filtering washing drainage, wherein filter residues are dry gypsum;
in the steps (2) and (4), after filtration, respectively carrying out primary washing, secondary washing and tertiary washing through primary washing water, secondary washing water and tertiary washing water in sequence;
in the step (2), collecting a washing water of the first-stage belt filter, performing gas-liquid separation, adding lime milk for neutralization until the pH value is 7-8, and performing filter pressing to obtain filter pressing filtrate; collecting secondary washing water, and separating gas from liquid to obtain primary washing water; collecting three washing water, and separating gas from liquid to obtain two washing water; the third washing water comprises filter-pressing filtrate and secondary filter-washing drainage;
in the step (4), clean water is used as the primary washing water, the secondary washing water and the tertiary washing water.
The technical scheme provided by the embodiment of the invention has the beneficial effects that:
(1) The parameters of the phosphogypsum after treatment are as follows: the moisture content is less than or equal to 20 percent, the total phosphorus is less than or equal to 1 percent, and the pH value is 6 to 8;
(2) The processing capacity is large, four primary belt filters (the model is HDJD-120) are matched with four secondary belt filters (the model is HDJD-120), the processing capacity reaches 500 ten thousand tons/year, and very few operators are needed;
(3) The wastewater generated in the process is utilized in different modes, so that the phosphorus yield is improved, the wastewater discharge is reduced, and the use of water is reduced;
(4) Different treatment modes are adopted for the first washing drainage, the second washing drainage and the third washing drainage of the two-stage belt filter, so that the use of water resources can be reduced while the washing effect is ensured;
(5) The primary filtering is performed with three times of water washing, the secondary filtering is performed with three times of water washing, the water washing is neutral or alkaline, part of phosphorus elements and other impurities can be washed out, the phosphogypsum is more convenient to treat, cement factories and the like can receive the phosphogypsum, the utilization way of the phosphogypsum is expanded, and the phosphogypsum can be used as building materials and cement coagulants;
(6) Compared with the conventional filter press, the belt filter has the advantages of high automation degree (such as automatic deslagging, automatic flushing and the like).
(7) Impurities such as phosphorus in washing water can be precipitated by lime, and washing liquid is alkaline to improve the washing effect;
(8) The press filtrate can be consumed in a variety of ways, including as tri-wash water, as make-up water for a cooling tower, for dissolving lime milk, etc., by make-up water and heating. The condensed water (cleaner, weak alkalinity and high temperature) has better washing effect when the hot water is concentrated by adopting ammonium phosphate;
(9) The three washing water and the reslurry water are both filter-pressed filtrate and secondary filter-washed drainage water, and can be balanced according to the requirement.
Drawings
FIG. 1 is a schematic block diagram of a comprehensive treatment method of phosphogypsum in an embodiment of the present invention;
FIG. 2 is a schematic diagram of the structure of a primary belt filter;
FIG. 3 is a schematic diagram of a two-stage belt filter.
In the figure: a filtering area 1, a washing area 2, a washing area 3 and a washing area 4.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, for the purpose of making the objects, technical solutions and advantages of the present invention more apparent.
Example 1
Referring to fig. 1, example 1 provides a comprehensive treatment method of phosphogypsum, which includes:
(1) Collecting phosphogypsum, concentrating by a thickener, taking the clear liquid obtained by concentration as phosphogypsum backwater, and delivering the slurry obtained by concentration to a first-stage belt filter for treatment.
(2) And (3) filtering the slurry obtained in the step (1) by using a first-stage belt filter, taking filtrate as phosphogypsum backwater, and conveying filter residues to the step (3) for treatment.
(3) Reslurrying the filter residue obtained in the step (2), reslurrying water and quicklime or lime milk to obtain phosphogypsum slurry, wherein the reslurrying water comprises filter pressing filtrate and secondary filter washing drainage.
(4) And (3) filtering the phosphogypsum slurry obtained in the step (3) by a secondary belt filter, combining filtrate, primary washing drainage, secondary washing drainage and tertiary washing drainage of the secondary belt filter as secondary filtering washing drainage, wherein filter residues are dry gypsum.
In the steps (2) and (4), after filtration, respectively carrying out primary washing, secondary washing and tertiary washing through primary washing water, secondary washing water and tertiary washing water in sequence;
in the step (2), collecting the first-stage washing water of the first-stage belt filter, and performing gas-liquid separation, adding quicklime or lime milk for neutralization and pressure filtration (filter residues obtained by pressure filtration are used as phosphogypsum which cannot be treated any more for landfill or wet stacking, so that the amount of phosphogypsum is very small and the damage to the environment is small) to obtain filter pressing filtrate; collecting secondary washing water, and separating gas from liquid to obtain primary washing water; collecting three washing water, and separating gas from liquid to obtain two washing water; the three washing water comprises filter pressing filtrate and secondary filtering washing drainage.
In step (4), clean water is used as the primary washing water, the secondary washing water and the tertiary washing water in order to ensure the cleaning effect.
The method improves the structure of the belt filter, a filter zone 1, a first washing zone 2, a second washing zone 3 and a third washing zone 4 are sequentially arranged on a conveyor belt along the conveying direction, a washing water spray head, a washing water collecting tank, a liquid discharge tank and the like are respectively arranged in the first washing zone 2, the second washing zone 3 and the third washing zone 4 in a matched mode, the washing water spray head is positioned right above the filter belt and sprays washing water to the filter belt, the washing water collecting tank is positioned below the filter belt adjacently for collecting washing water and discharging water, the washing water collecting tank is connected with the liquid discharge tank through a pipeline, and the liquid discharge tank is used for realizing gas-liquid separation; the liquid discharge tank is connected with a condensing vacuum system through a pipeline and is used for vacuumizing (-60 to-70 KPa).
Wherein, the index of phosphogypsum generated by wet phosphoric acid is: the pH value is 2-3, the total phosphorus is 1.5-2.0%, the moisture content is 65-70%, and the thickness of the filter cake is 25-35mm.
Wherein in the step (1), the thickener concentrates the phosphogypsum to a density of 1.3-1.4g/mL.
Wherein in step (2), quicklime or milk of lime is added to a wash effluent to adjust the pH to 7-8, preferably milk of lime for automatic conditions.
Further, in the step (2), after three-stage washing, the filter belt is washed by adopting one-stage washing water, the one-stage washing drainage is collected, the one-stage washing drainage is settled, clear liquid is used as one-stage washing water, and mud is sent to a feed inlet of the one-stage belt filter. Specifically, the wastewater may be collected and settled by a primary rinse water settling tank, and the supernatant may be stored by a primary filter cloth rinsing tank. In the step (4), the filter belt is washed by adopting secondary washing water after three-washing, secondary washing drainage is collected, sedimentation is carried out on the secondary washing drainage, clear liquid is used as secondary washing water, and mud is sent to a feed inlet of the secondary belt filter. Correspondingly, the device comprises a secondary flushing water sedimentation tank and a secondary filter cloth flushing tank.
Wherein in the steps (2) and (4), the primary washing water, the secondary washing water and the tertiary washing water are heated to 50 ℃ and above. A heating water tank or a pipe heater is provided accordingly to ensure the temperature of the wash water.
Preferably, condensed water (having a relatively high temperature, being weakly alkaline) is recovered when the ammonium phosphate is concentrated (e.g., a multi-effect evaporator), and hot water (preferably above 70 ℃) is obtained by heating the condensed water with steam (by low pressure steam) or without heating, and the hot water is mixed with the primary wash water, the secondary wash water, the tertiary wash water, the primary wash water, and the secondary wash water as needed to heat the primary wash water, the secondary wash water, the tertiary wash water, and the wash water. The hot water is alkalescent, and has better flushing effect.
Wherein in step (3), the pH value of the phosphogypsum slurry is adjusted to 6-8, and the density is adjusted to 1.3-1.4g/mL.
Further, in the steps (2) and (4), after gas-liquid separation, the gas is condensed through a condenser, a cooling tower and the condenser form a circulating cooling system, and the filter pressing filtrate is used as water supplement of the circulating cooling system.
Preferably, lime milk is used in steps (2) and (4), and the lime milk is prepared from quicklime and filter pressing filtrate.
Specifically, the comprehensive treatment method of phosphogypsum provided by the embodiment of the invention comprises the following steps:
(1) And collecting phosphogypsum, concentrating the density of the phosphogypsum to 1.3-1.4g/mL by a thickener, taking the clear liquid obtained by concentration as phosphogypsum backwater, and conveying the slurry obtained by concentration to a first-stage belt filter for treatment.
(2) And (3) filtering the slurry obtained in the step (1) by using a first-stage belt filter, taking filtrate as phosphogypsum backwater, and conveying filter residues to the step (3) for treatment.
(3) Reslurrying the filter residue, reslurry water and lime milk obtained in the step (2) to obtain phosphogypsum slurry with the pH value of 6-8 and the density of 1.3-1.4g/mL, wherein the reslurry water comprises filter pressing filtrate and secondary filtering washing drainage.
(4) And (3) filtering the phosphogypsum slurry obtained in the step (3) by a secondary belt filter, combining filtrate, primary washing drainage, secondary washing drainage and tertiary washing drainage of the secondary belt filter as secondary filtering washing drainage, wherein filter residues are dry gypsum.
In the steps (2) and (4), after filtration, respectively carrying out primary washing, secondary washing and tertiary washing through primary washing water, secondary washing water and tertiary washing water in sequence;
in the step (2), collecting a washing water of the first-stage belt filter, performing gas-liquid separation, adding lime milk for neutralization until the pH value is 7-8, and performing filter pressing to obtain filter pressing filtrate; collecting secondary washing water, and separating gas from liquid to obtain primary washing water; collecting three washing water, and separating gas from liquid to obtain two washing water; the three washing water comprises filter pressing filtrate and secondary filtering washing drainage.
In the step (4), clean water is used as the primary washing water, the secondary washing water and the tertiary washing water.
Example 2
Referring to fig. 1-3, example 2 provides an integrated treatment process for phosphogypsum, comprising:
(1) Phosphogypsum is collected by a phosphogypsum collecting tank, the density of the phosphogypsum is concentrated to 1.3-1.4g/mL by a thickener, clear liquid obtained by concentration is sent to an overflow water tank to be used as phosphogypsum backwater, and slurry obtained by concentration is sent to a first-stage belt filter to be treated.
(2) And (3) filtering the slurry obtained in the step (1) by a first-stage belt filter, performing gas-liquid separation on the filtrate through a first-stage liquid discharge tank to obtain phosphogypsum backwater, and conveying filter residues to the step (3) for treatment.
(3) Reslurrying the filter residue, reslurry water and lime milk obtained in the step (2) in a reslurry neutralization tank to obtain phosphogypsum slurry with the pH value of 6-8 and the density of 1.3-1.4g/mL, wherein the reslurry water comprises filter pressing filtrate (from a filter pressing liquid storage tank) and secondary filter washing drainage (from a secondary filtrate collection tank).
(4) And (3) filtering phosphogypsum slurry obtained in the step (3) by a secondary belt filter, wherein filtrate of the secondary belt filter (sent to a first secondary liquid discharge tank for gas-liquid separation), primary washing drainage (sent to a second secondary liquid discharge tank for gas-liquid separation), secondary washing drainage (sent to a third secondary liquid discharge tank for gas-liquid separation) and tertiary washing drainage (sent to a fourth secondary liquid discharge tank for gas-liquid separation) are combined to be used as secondary filtering drainage (sent to a secondary filtrate collecting tank for storage), and filter residues are dry gypsum.
In steps (2) and (4), the slurry/gypsum slurry is filtered in the filtration zone 1, first washed by a wash water in the first washing zone 2, second washed by a wash water in the second washing zone 3, third washed by a wash water in the third washing zone 4, and the filter belt is washed by a wash water in the lower side of the rear end of the filter belt.
In the step (2), collecting a washing drainage of a first-stage belt filter through a second-stage drainage tank, performing gas-liquid separation through the second-stage drainage tank, adding lime milk into a first-stage buffer tank to neutralize to a pH value of 7-8, and performing filter pressing through a filter press to obtain filter pressing filtrate (sent to a filter pressing liquid storage tank for storage); collecting secondary washing drainage through a third-stage drainage tank, and taking the secondary washing drainage as primary washing water (heating is needed on the basis) after gas-liquid separation of the third-stage drainage tank; collecting three washing drainage water through a fourth-stage drainage tank, and taking the three washing drainage water as secondary washing water (heating is needed on the basis) after gas-liquid separation of the fourth-stage drainage tank; the three washing water (which is heated based on the need) comprises filter pressing filtrate and secondary filtering washing drainage.
In step (4), collecting filtrate in filtration zone 1 through a first secondary drainage tank; washing the first water in a washing area 2 by clean water, and collecting washing drainage water by a second-stage drainage tank; the second washing is carried out in the second washing area 3 through clear water, and the second washing drainage is collected through a third second-stage drainage tank; three-washing is carried out in the three-washing area 4 through clear water, and three-washing drainage water is collected through a fourth secondary drainage tank; the filter belt is flushed by flushing water at the lower side of the rear end of the filter belt. The first secondary liquid discharge tank, the second secondary liquid discharge tank, the third secondary liquid discharge tank and the fourth secondary liquid discharge tank are respectively subjected to gas-liquid separation, and then liquid is collected in the secondary filtrate collecting tank.
The "first", "second", "third" and "fourth" in this embodiment are merely used for distinguishing, and have no other special meaning.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (3)
1. The comprehensive phosphogypsum treatment method is characterized by comprising the following steps:
(1) Collecting phosphogypsum, concentrating the density of the phosphogypsum to 1.3-1.4g/mL through a thickener, taking the clear liquid obtained by concentration as phosphogypsum backwater, and conveying the slurry obtained by concentration to a first-stage belt filter for treatment;
(2) The first-stage belt filter filters the slurry obtained in the step (1), the filtrate is taken as phosphogypsum backwater, and filter residues are sent to the step (3) for treatment;
(3) Reslurrying the filter residue, reslurry water and lime milk obtained in the step (2) to obtain phosphogypsum slurry with the pH value of 6-8 and the density of 1.3-1.4g/mL, wherein the reslurry water comprises filter pressing filtrate and secondary filtering washing drainage;
(4) Filtering phosphogypsum slurry obtained in the step (3) by a secondary belt filter, combining filtrate, primary washing drainage, secondary washing drainage and tertiary washing drainage of the secondary belt filter as secondary filtering washing drainage, wherein filter residues are dry gypsum;
in the steps (2) and (4), after filtration, respectively carrying out primary washing, secondary washing and tertiary washing through primary washing water, secondary washing water and tertiary washing water in sequence;
in the step (2), collecting a washing water of the first-stage belt filter, performing gas-liquid separation, adding lime milk for neutralization until the pH value is 7-8, and performing filter pressing to obtain filter pressing filtrate; collecting secondary washing water, and separating gas from liquid to obtain primary washing water; collecting three washing water, and separating gas from liquid to obtain two washing water; the third washing water comprises filter-pressing filtrate and secondary filter-washing drainage;
in the step (4), clean water is adopted as primary washing water, secondary washing water and tertiary washing water;
in the step (2), after three-washing, the filter belt is washed by adopting primary washing water, primary washing drainage is collected, sedimentation is carried out on the primary washing drainage, clear liquid is used as primary washing water, and mud is sent to a feed inlet of a primary belt filter; in the step (4), after three-washing, the filter belt is washed by adopting secondary washing water, secondary washing drainage is collected, sedimentation is carried out on the secondary washing drainage, clear liquid is used as secondary washing water, and mud is sent to a feed inlet of a secondary belt filter;
in the steps (2) and (4), the primary washing water, the secondary washing water and the tertiary washing water are heated to 50 ℃ and above;
and (3) recovering condensed water obtained during the concentration of ammonium phosphate, heating or not heating the condensed water by steam to obtain hot water, and mixing the hot water with primary washing water, secondary washing water, tertiary washing water, primary washing water and secondary washing water.
2. The integrated treatment method of phosphogypsum according to claim 1, wherein in the steps (2) and (4), the gas is condensed by a condenser after gas-liquid separation, a cooling tower and the condenser form a circulating cooling system, and the filter-press filtrate is used as water supplement of the circulating cooling system.
3. The integrated treatment method of phosphogypsum according to claim 1, wherein the lime milk is prepared from quicklime and press filtration filtrate.
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| CN202210980036.5A CN115557719B (en) | 2022-08-16 | 2022-08-16 | Comprehensive treatment method of phosphogypsum |
| PCT/CN2023/109237 WO2024037298A1 (en) | 2022-08-16 | 2023-07-26 | Integrated treatment method for phosphogypsum |
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| WO2024037298A1 (en) | 2024-02-22 |
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