CN115672938A - Method for synchronously and stably curing multiple heavy metals by core-shell structure glass curing body - Google Patents
Method for synchronously and stably curing multiple heavy metals by core-shell structure glass curing body Download PDFInfo
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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 invention relates to a method for synchronously and stably curing multiple heavy metals by a core-shell structure glass cured body, belonging to the technical field of harmless treatment of hazardous solid wastes. The method is characterized in that hazardous waste related to heavy metals is taken as a solidification object, the hazardous waste related to heavy metals is mixed with other waste residues or minerals to form a basic batch, metastable glass beads are formed through melting homogenization and metastable molding, and the special glass solidification body with a crystal coated glass phase core-shell structure is formed through natural accumulation, sintering and crystallization of the metastable glass beads. Heavy metal is synergistically blocked by three modes of glass phase wrapping, crystal lattice solidification and integral blocking of a crystal shell layer, and the synchronous stable solidification of multiple heavy metal elements is realized. The invention has the advantages that firstly, the multi-element heavy metal hazardous waste can be solidified, the multi-element heavy metal in the glass solidified body of the hazardous solid waste is dissolved out to be nearly zero, and the multi-element heavy metal is synchronously and stably solidified; secondly, the solidification process of the hazardous waste heavy metal elements is highly coupled with the recycling process of the hazardous waste resources, and the special glass solidified body prepared by utilizing the hazardous waste can be used for manufacturing building decoration materials, engineering glass-ceramic plates and the like.
Description
Technical Field
The invention discloses a method for synchronously and stably curing multiple heavy metals by a core-shell structure glass curing body, belonging to the field of environmental protection. The aim is to synchronously and stably solidify the multiple heavy metal elements in the dangerous solid waste, reduce the harm of the dangerous solid waste to the ecological environment and the human health, realize the harmless disposal of the dangerous solid waste and synchronously carry out resource recycling.
Background
With the rapid development of industry and economy in China, the yield of dangerous solid wastes is increased year by year, and the solid wastes containing heavy metals have great harm to the ecological environment and the health of people. Heavy metal elements such as Cd, ni, mn, pb, co and the like contained in metallurgical waste residues, stainless steel acid-washing sludge, waste incineration fly ash and waste materials in new energy industry have great destructive effect on the health of people and the environment. According to statistics, the total output of hazardous wastes in China exceeds about 1 hundred million tons, the heavy metal-containing hazardous wastes account for about one third, the annual output of the heavy metal-containing hazardous wastes is rapidly increased, and the existence of multiple high-harm heavy metal elements brings great challenges to the harmless treatment of the hazardous solid wastes. How to control the pollution of heavy metals becomes a problem which needs to be solved urgently at present.
The curing technology has become a focus of attention with the advantages of low cost, high curing efficiency, simple method and the like. However, the current research shows that the solidification technologies or methods such as asphalt solidification, cement solidification, geopolymer solidification and chelate solidification have great limitations in synchronously solidifying multiple high-harm elements, and the problems of incomplete solidification, secondary dissolution and the like still exist. For example: cement curing techniques are one of the commonly used curing processes, but cement curing techniques also have problems during application: (1) The portland cement solidification body has high porosity and poor durability, and is easy to dissolve out heavy metal elements under the corrosion of an acid medium. (2) The heavy metal content is increased, the strength of a cement solidified body is reduced, the cement solidification time is delayed, and the stability of the solidified body is poor.
Compared with other stabilizing methods, chemical agent stabilization has the advantages of simple process, low energy consumption, small capacity-increasing ratio, moderate cost, low cost and the like, and is widely applied. However, the hazardous solid waste stabilized by the chelating agent has a large specific surface area, which can cause rapid leaching of heavy metals, and in addition, the chelating agent has high selectivity and cannot synchronously and stably solidify multiple heavy metal elements.
The geopolymer solidified heavy metal has some problems at present, for example, the intensity of the geopolymer is reduced due to high heavy metal content and multiple element types, and the dissolution risk of heavy metal ions is increased.
The glass solidification is to contain heavy metals in a glass three-dimensional network, generally belongs to a solid solution combined state, and heavy metal ions cannot percolate out along with the time under the acidic environment of a refuse landfill so as to achieve the aim of solidifying the heavy metals. However, the glass is easy to be devitrified or spontaneously crystallized under the conditions of high temperature and high pressure, and the leaching resistance of the glass body is reduced; in recent years, special glass curing heavy metals are tried, wherein typical representatives of the special glass curing heavy metals are microcrystalline glass, the microcrystalline glass has excellent optical characteristics and chemical stability, high mechanical strength and stronger acid-base corrosion resistance than most of composite materials, can be used for various industries such as anticorrosive coatings, architectural decoration, aerospace and the like, compared with the technologies such as cement curing, geopolymer curing and the like, the microcrystalline glass has more advantages as a curing material, and Chinese patent application (CN 104445944A) discloses a method for preparing the microcrystalline glass by using dangerous solid wastes. The patent relates to a method for preparing a glass-coated crystalline phase microcrystalline glass solidified body from hazardous solid wastes to solidify heavy metal elements such as Cr, pb, cd, ni, cu and Zn, wherein the leaching concentrations of Pb and Zn in the microcrystalline solidified body prepared from lead-zinc smelting slag respectively reach 5.0mg/L (leaching limit value: 5.0 mg/L) and 3.4mg/L, and the leaching concentrations of Pb, cd and Ni in the microcrystalline solidified body prepared from fly ash and waste glass respectively reach 1.02mg/L, 1.0mg/L (leaching limit value: 1.0 mg/L) and 1.0 mg/L. The Chinese invention patent (CN 10397979794A) discloses a method for preparing microcrystalline glass with wollastonite, gehlenite, diopside and gunite as main crystal phases by using heavy metal waste gypsum to cure Pb, cr, cu and Zn, wherein the curing effects of the heavy metals are different. In summary, the microcrystalline glass still faces many problems in the aspect of synchronously curing various high-hazard elements, and the fundamental reason is that the prepared microcrystalline glass has a structure of a glass phase coated crystal, and a large number of glass phase-crystal phase interfaces exist in the structure, so that the glass is more easily corroded compared with a crystal phase under an acidic condition, and heavy metal elements existing in the glass phase and the phase interfaces are easily dissolved out, so that the risk of secondary dissolution of heavy metal ions is increased.
In conclusion, the spatial distribution of the glass phase and the crystalline phase in the organizational structure has a significant influence on the dissolution of heavy metal ions, and a glass solidified body with a special structure is urgently needed in the field to synchronously solidify multiple high-hazard heavy metal elements, and simultaneously, the cyclic utilization of dangerous solid wastes is considered, so that support is provided for the macro harmless disposal of the dangerous solid wastes.
The invention content is as follows:
aiming at the problems in the prior art, the invention performs special spatial distribution control on glass phases and crystals in an organization structure, and designs a special glass solidified body consisting of core-shell structure units with the glass phases coated by the crystals.
On one hand, the problem that heavy metal elements are easy to concentrate at a glass phase-crystal phase interface and can not be stably solidified is solved; on the other hand, the problem that the existing curing/stabilizing technology can not cure the multiple heavy metal ions synchronously and stably is solved.
In order to achieve the above purpose, the present invention is realized by the following specific scheme:
firstly, mixing the heavy metal dangerous solid waste and other auxiliary materials such as silica, limestone and the like uniformly to form a basic batch. Then putting the glass melt into a melting furnace for melting and clarifying to form qualified glass melt, forming the glass melt into glass beads through air cooling, water cooling or other modes, and filling the glass beads into a mold, and sintering and crystallizing to form a solidified body consisting of a plurality of core-shell structure units of crystal coated glass phases, wherein the method comprises the following specific steps:
(1) Compatibility and mixing: one or two or more of hazardous solid wastes such as chromium slag, waste incineration fly ash, electroplating sludge, lead-zinc slag and the like and mineral raw materials such as silica, limestone and the like are sieved by a 40-mesh sieve, weighed and uniformly mixed to form a basic batch;
(2) Melting and homogenizing: putting the basic mixture into a melting furnace, and melting at 1200-1500 ℃ for 1.0-4.0 h to form a homogeneous glass melt;
(3) And (3) carrying out metastable forming: forming the clarified glass melt into glass beads by air cooling, water cooling or other modes;
(4) And (3) sintering and crystallizing: the glass beads are filled in a mold and stacked at the temperature of 800-1200 ℃ for crystallization for 1.0-5.0 h, and the special glass solidified body consisting of a core-shell structure unit with an infinite crystal coated glass phase is obtained.
(5) The leaching concentrations of Cr, ni, mn, pb and Cd ions in the glass solidified body with the crystal-coated glass phase core-shell structure prepared by the invention are all 10 -2 The mg/L order of magnitude is far lower than the limit values of national standard (GB 5085.3-2007) (total Cr is 15mg/L, hexavalent Cr is 5mg/L, ni is 5mg/L, pb is 5mg/L, cd is 1 mg/L), and the core-shell structure glass solidified body can synchronously and stably solidify multiple heavy metal ions such as Cr, mn, ni, pb, cd and the like.
Compared with the prior art, the invention has the following beneficial effects:
(1) Multiple heavy metal synchronous solidification
The traditional glass and the glass ceramics generally have less heavy metal types which can be synchronously and stably solidified, and the invention can synchronously solidify two or more heavy metals by utilizing a special core-shell structure.
(2) Stable solidification of multiple heavy metals
The traditional microcrystalline glass solidified body has a structure of glass phase coated crystalline phase, the invention is realized by ' the way of ' coating the glass phase by the crystalline phase ', the glass phase with weak corrosion resistance is coated by the crystalline phase, and the heavy metal which is easy to separate from the system is prevented from being enriched at the interface of the glass phase and the crystalline phase by a crystalline shell layer, so that the leaching of heavy metal ions can be greatly reduced, and the multi-element heavy metal synchronous-stable solidification is realized.
(3) Harmless treatment and cooperative recycling cyclic utilization of various hazardous wastes
The raw materials of the special glass solidified body can be two or more than two dangerous solid wastes, the harmless disposal level of the dangerous wastes is improved, and the glass solidified body with the core-shell structure can be used as the raw materials for manufacturing building decoration materials and engineering glass-ceramic plates, so that the resource recycling of the dangerous wastes is realized.
Drawings
FIG. 1 shows a process for preparing a core-shell structure glass-cured body according to the present invention
FIG. 2 shows a core-shell structure of a glass solidification body
Detailed Description
For the purpose of facilitating an understanding of the present invention, the following examples are set forth herein. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
The chromium slag used in the present example comprises the following components: siO 2 2 15.0-20.0 wt%, caO 5.0-8.0 wt%, mgO 8.0-15.0 wt%, al 2 O 3 The content of (B) is 8.0-12.0 wt%, fe 2 O 3 The content of (A) is 5.0-10.0 wt%, na 2 O content of 2.0-5.0 wt%, K 2 2.0 to 5.0 weight percent of O and Cr 2 O 3 The content of (B) is 2.0-5.0 wt%, tiO 2 The content of (A) is 1.0-5.0 wt%; the stainless steel slag comprises the following components: siO 2 2 20.0-30.0 wt% of Al 2 O 3 The content of (B) is 5.0-10.0 wt%, fe 2 O 3 0.0-2.0 wt%, caO 25.0-30.0 wt%, mgO 15.0-20.0 wt%, and Cr 2 O 3 2.0 to 10.0 weight percent of NiO, 1.0 to 5.0 weight percent of NiO, P 2 O 5 The content of (B) is 2.0-5.0 wt%.
(1) Compatibility and mixing: weighing 45wt% of chromium slag, 30wt% of stainless steel slag, 20wt% of silica and 5wt% of limestone, and mixing in a compatible manner until the mixture is uniform to form a basic mixture;
(2) Melting and homogenizing: putting the basic mixture into a melting furnace, and melting at 1300-1500 ℃ for 2.0-4.0 h to form a homogeneous glass melt;
(3) And (3) carrying out metastable forming: forming the clear glass melt into glass beads by air cooling, water cooling or other modes;
(4) And (3) sintering and crystallizing: the glass beads are filled in a mold and stacked in the temperature range of 800-1200 ℃ for sintering crystallization for 1.0-5.0 h, and the special glass solidified body consisting of core-shell structure units with countless crystal coated glass phases is obtained.
(5) The toxicity leaching test of the obtained special glass solidified body is carried out by adopting a solid waste leaching toxicity leaching method-sulfuric acid nitric acid method (HJ/T299-2007), and the leaching concentrations of Cr and Ni are 0.003mg/L and 0.09mg/L respectively.
Example 2
The composition of the lead-zinc slag used in the embodiment is as follows: siO 2 2 30.0-38.0 wt%, caO 12.0-20.0 wt%, mgO 5.0-10.0 wt%, al 2 O 3 The content of (B) is 8.0-15.0 wt%, fe 2 O 3 The content of (B) is 28.0-35.0 wt%, the content of ZnO is 0-3.0 wt%, and the content of PbO is 0-2 wt%.
(1) Compatibility and mixing: weighing 70wt% of lead-zinc slag, 20wt% of silica and 10wt% of limestone, and mixing in a compatibility manner until the mixture is uniform to form a basic mixture;
(2) Melting and homogenizing: putting the basic mixture into a melting furnace, and melting at 1300-1500 ℃ for 2.0-4.0 h to form a homogeneous glass melt;
(3) And (3) carrying out metastable forming: forming the clarified glass melt into glass beads by air cooling, water cooling or other modes;
(4) And (3) sintering and crystallizing: the glass beads are filled in a mold and stacked in the temperature range of 800-1200 ℃ for sintering crystallization for 1.0-5.0 h, and the special glass solidified body consisting of core-shell structure units with countless crystal coated glass phases is obtained.
(5) And (3) performing a toxicity leaching test on the obtained microcrystal solidified body by adopting a solid waste leaching toxicity leaching method, namely a sulfuric acid-nitric acid method (HJ/T299-2007), wherein the leaching concentrations of Zn and Pb are 0.06mg/L and 0.09mg/L respectively.
Example 3
The chromium slag used in the present example comprises the following components: siO 2 2 15.0-20.0 wt%, caO 5.0-8.0 wt%, mgO 8.0-15.0 wt%, al 2 O 3 The content of (B) is 8.0-12.0 wt%, fe 2 O 3 The content of (A) is 5.0-10.0 wt%, na 2 O content of 2.0-5.0 wt%, K 2 2.0 to 5.0 weight percent of O and Cr 2 O 3 In an amount of2.0 to 5.0wt% of TiO 2 The content of (A) is 1.0-5.0 wt%; the lead-zinc slag comprises the following components: siO 2 2 30.0-38.0 wt%, caO 12.0-20.0 wt%, mgO 5.0-10.0 wt%, al 2 O 3 The content of (B) is 8.0-15.0 wt%, fe 2 O 3 The content of (B) is 28.0-35.0 wt%, the content of ZnO is 0-3.0 wt%, and the content of PbO is 0-2 wt%.
(1) Compatibility and mixing: weighing 40wt% of chromium slag, 30wt% of lead-zinc slag, 20wt% of silica and 10wt% of limestone, and mixing in a compatibility manner until the mixture is uniform to form a basic mixture;
(2) Melting and homogenizing: putting the basic mixture into a melting furnace, and melting at 1200-1500 ℃ for 2.0-4.0 h to form a homogeneous glass melt;
(3) And (3) carrying out metastable forming: the clarified glass melt is formed into vitreous beads by air cooling, water cooling or other means
(4) And (3) sintering and crystallizing: the glass beads are filled in a mold and stacked in the temperature range of 800-1200 ℃ for sintering crystallization for 1.0-5.0 h, and the special glass solidified body consisting of core-shell structure units with countless crystal coated glass phases is obtained.
(5) The obtained microcrystal solidified body is subjected to toxicity leaching test by adopting a solid waste leaching toxicity leaching method, namely a sulfuric acid nitric acid method (HJ/T299-2007), and the leaching concentrations of Cr, ni and Pb are respectively 0.003mg/L, 0.15mg/L and 0.09mg/L.
Example 4
The composition of the waste incineration fly ash used in the embodiment is as follows: siO 2 2 8.0-30.0 wt%, caO 15.0-45.0 wt%, mgO 1.0-5.0 wt%, al 2 O 3 The content of (B) is 2.0-12.0 wt%, fe 2 O 3 The content of (A) is 1.0-5.0 wt%, na 2 O content of 2.0-8.0 wt%, K 2 2.0 to 6.0 weight percent of O and TiO 2 The content of (A) is 1.0 to 2.0wt%, the content of Cl is 10.0 to 20.0wt%, and the total content of RO (R = Pb, cr, cd, mn, zn) is 1.0 to 3.0wt%; the stainless steel slag comprises the following components: siO 2 2 20.0-30.0 wt% of Al 2 O 3 The content of (B) is 5.0-10.0 wt%, fe 2 O 3 Is 0.02.0wt%, caO 25.0-30.0 wt%, mgO 15.0-20.0 wt%, cr 2 O 3 2.0-10.0 wt%, niO 1.0-5.0 wt%, P 2 O 5 The content of (B) is 2.0-5.0 wt%.
(1) Compatibility and mixing: weighing 50% of waste incineration fly ash, 30% of stainless steel slag and 20% of silica by weight, and mixing in a compatibility manner until the mixture is uniform to form a basic mixture;
(2) Melting and homogenizing: putting the basic mixture into a melting furnace, and melting for 2.0-4.0 h at 1200-1500 ℃ to form a homogeneous glass melt;
(3) Carrying out metastable forming: forming the clarified glass melt into glass microspheres by air cooling, water cooling or other modes;
(4) And (3) sintering and crystallizing: the glass beads are filled in a mold and stacked in the temperature range of 800-1200 ℃ for sintering crystallization for 1.0-5.0 h, and the special glass solidified body consisting of core-shell structure units with countless crystal coated glass phases is obtained.
(5) The obtained microcrystal solidified body is subjected to toxicity leaching test by adopting a solid waste leaching toxicity leaching method, namely sulfuric acid nitric acid (HJ/T299-2007), and the leaching concentrations of Cr, mn, ni, pb, cd and Zn are respectively 0.003mg/L, 0.06mg/L, 0.10mg/L, 0.05mg/L,0.08mg/L and 0.09mg/L.
Example 5
The composition of the electroplating sludge used in this example was: siO 2 2 5.0-35.0 wt%, caO 2.0-20.0 wt%, mgO 1.0-15.0 wt%, al 2 O 3 The content of (B) is 5.0-20.0 wt%, fe 2 O 3 The content of (A) is 5.0-20.0 wt%, na 2 O content of 1.0-4.0 wt%, K 2 1.0 to 2.0 weight percent of O, 1.0 to 5.0 weight percent of ZnO, and Cr 2 O 3 The content of the NiO is 1.0 to 8.0 weight percent, the content of the NiO is 1.0 to 15.0 weight percent, and the content of the PbO is 0.0 to 1.0 weight percent.
(1) Compatibility and mixing: weighing a certain amount of electroplating sludge, and putting the electroplating sludge into an electrothermal blowing drying oven to dry for 24 hours at 120 ℃. The dried sample is crushed in a crusher and then sieved by a 120-mesh sieve. Weighing 70wt% of powder sample, 20wt% of silica and 10wt% of limestone, and mixing in a compatibility manner until the mixture is uniform to form a base mixture;
(2) Melting and homogenizing: putting the basic mixture into a melting furnace, and melting for 2.0-4.0 h at 1200-1500 ℃ to form a homogeneous glass melt;
(3) And (3) carrying out metastable forming: forming the clear glass melt into glass beads by air cooling, water cooling or other modes;
(4) And (3) sintering and crystallizing: the glass body micro-beads are filled into a mold and stacked in the temperature range of 800-1200 ℃ for sintering crystallization for 1.0-5.0 h, and the special glass solidified body consisting of core-shell structural units with countless crystal coated glass phases is obtained.
(5) The obtained microcrystal solidified body is subjected to toxicity leaching test by adopting a solid waste leaching toxicity leaching method-a sulfuric acid nitric acid method (HJ/T299-2007), and the leaching concentrations of Cr, zn, ni, pb, cd and Cu are respectively 0.008mg/L,0.05mg/L,0.08mg/L,0.04mg/L, 0.054mg/L and 0.065 mg/L
mg/L。
It should be noted that, according to the above embodiments of the present invention, those skilled in the art can fully implement the full scope of the present invention as defined by the independent claims and the dependent claims, and implement the processes and methods as the above embodiments; and the invention has not been described in detail so as not to obscure the present invention. The above description is only a part of the embodiments of the present invention, but the scope of the present invention is not limited thereto. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (7)
1. A method for synchronously and stably curing multiple heavy metals by a core-shell structure glass curing body is characterized by comprising the following steps: the compatible raw materials of the solidified body contain hazardous solid wastes such as chromium slag, electroplating sludge, waste incineration fly ash, lead and zinc slag and the like, and the hazardous solid wastes contain various heavy metal elements such as Mn, pb, ni, cr, co and the like.
2. The solidified body base batch according to claim 1 is prepared by mixing one or two or more of chromium slag, waste incineration fly ash, electroplating sludge, lead-zinc slag and the like with other minerals or waste residues such as silica, limestone, feldspar, fly ash and the like.
3. A method for synchronously and stably curing multiple heavy metals by a core-shell structure glass cured body is characterized by comprising the following steps: the surface layer of the structural unit of the special glass solidified body is composed of crystals, and the core area is composed of a glass phase to form an organization structure of 'non-crystal nucleus-crystal shell' with the glass phase coated by the crystals.
4. A method for synchronously and stably curing multiple heavy metals by a core-shell structure glass curing body is characterized by comprising the following steps: the glass solidified body can synchronously solidify two or more than two of heavy metals such as Cr, ni, mn, pb and the like.
5. The method for synchronously and stably curing the polynary heavy metal by the core-shell structure glass cured body according to claim 4, wherein the heavy metal ions are blocked in multiple ways by a method of wrapping the heavy metal ions by a network structure of a glass phase, curing the heavy metal ions by crystal lattices and physically blocking the heavy metal ions by a crystal shell layer, so that the synchronous and stable curing of the polynary heavy metal ions is realized.
6. A method for synchronously and stably curing multiple heavy metals by a core-shell structure glass cured body is characterized by comprising the following steps: first, according to claim 1, the heavy metal dangerous solid waste and other auxiliary materials such as silica, limestone are mixed uniformly to form a basic batch. Then putting the glass melt into a melting furnace for melting and clarifying to form qualified glass melt, forming the glass melt into glass beads, and filling the glass beads into a mold and sintering and crystallizing to form a solidified body consisting of an infinite number of core-shell structure units, wherein the method comprises the following specific steps:
(1) Compatibility and mixing: one or two or more of hazardous solid wastes such as chromium slag, waste incineration fly ash, electroplating sludge, lead-zinc slag and the like and mineral raw materials such as silica, limestone and the like are sieved by a 40-mesh sieve, weighed and uniformly mixed to form a basic batch;
(2) Melting and homogenizing: putting the basic mixture into a melting furnace, and melting at 1200-1500 ℃ for 1.0-4.0 h to form a homogeneous glass melt;
(3) And (3) carrying out metastable forming: forming the clarified glass melt into glass beads by air cooling, water cooling or other modes;
(4) And (3) sintering and crystallizing: the glass beads are filled in a mold and stacked in the temperature range of 800-1200 ℃ and sintered for 1.0-5.0 h to obtain the special glass solidified body consisting of core-shell structural units with countless crystal coated glass phases.
7. The method for synchronously and stably curing the multiple heavy metals by the core-shell structure glass cured body according to claim 6, characterized in that: the leaching concentration of heavy metal ions such as Cr, ni, mn, pb, cd and the like is 10 -2 The magnitude of mg/L is far lower than the limit value of national standard (GB 5085.3-2007) (total Cr:15mg/L, hexavalent Cr:5mg/L, ni:5mg/L, pb:5mg/L, cd:1 mg/L), and the glass solidified body can synchronously-stably solidify the multiple heavy metal ions such as Cr, mn, ni, pb, cd, etc.
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