CN113996631A - Method for solidifying calcium arsenate slag cement - Google Patents
Method for solidifying calcium arsenate slag cement Download PDFInfo
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- CN113996631A CN113996631A CN202111151495.4A CN202111151495A CN113996631A CN 113996631 A CN113996631 A CN 113996631A CN 202111151495 A CN202111151495 A CN 202111151495A CN 113996631 A CN113996631 A CN 113996631A
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- slag
- calcium arsenate
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- 239000002893 slag Substances 0.000 title claims abstract description 80
- RMBBSOLAGVEUSI-UHFFFAOYSA-H Calcium arsenate Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-][As]([O-])([O-])=O.[O-][As]([O-])([O-])=O RMBBSOLAGVEUSI-UHFFFAOYSA-H 0.000 title claims abstract description 67
- 229940103357 calcium arsenate Drugs 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000004568 cement Substances 0.000 title claims abstract description 33
- 239000002245 particle Substances 0.000 claims abstract description 39
- 239000010426 asphalt Substances 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000004576 sand Substances 0.000 claims abstract description 11
- 239000000853 adhesive Substances 0.000 claims abstract 2
- 230000001070 adhesive effect Effects 0.000 claims abstract 2
- 238000002156 mixing Methods 0.000 claims description 13
- 239000011230 binding agent Substances 0.000 claims description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 238000003723 Smelting Methods 0.000 claims description 4
- 239000004927 clay Substances 0.000 claims description 4
- 229920001684 low density polyethylene Polymers 0.000 claims description 3
- 239000004702 low-density polyethylene Substances 0.000 claims description 3
- 229910052785 arsenic Inorganic materials 0.000 abstract description 32
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 abstract description 32
- 238000002386 leaching Methods 0.000 abstract description 16
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 231100000419 toxicity Toxicity 0.000 abstract description 4
- 230000001988 toxicity Effects 0.000 abstract description 4
- GSYZQGSEKUWOHL-UHFFFAOYSA-N arsenic calcium Chemical compound [Ca].[As] GSYZQGSEKUWOHL-UHFFFAOYSA-N 0.000 abstract description 3
- 238000009270 solid waste treatment Methods 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 238000001514 detection method Methods 0.000 description 6
- 238000001723 curing Methods 0.000 description 4
- -1 ferrous metals Chemical class 0.000 description 4
- 238000007711 solidification Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- DJHGAFSJWGLOIV-UHFFFAOYSA-K Arsenate3- Chemical compound [O-][As]([O-])([O-])=O DJHGAFSJWGLOIV-UHFFFAOYSA-K 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 229940000489 arsenate Drugs 0.000 description 3
- CUGMJFZCCDSABL-UHFFFAOYSA-N arsenic(3+);trisulfide Chemical compound [S-2].[S-2].[S-2].[As+3].[As+3] CUGMJFZCCDSABL-UHFFFAOYSA-N 0.000 description 3
- 238000005469 granulation Methods 0.000 description 3
- 230000003179 granulation Effects 0.000 description 3
- UYZMAFWCKGTUMA-UHFFFAOYSA-K iron(3+);trioxido(oxo)-$l^{5}-arsane;dihydrate Chemical compound O.O.[Fe+3].[O-][As]([O-])([O-])=O UYZMAFWCKGTUMA-UHFFFAOYSA-K 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011133 lead Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- GOLCXWYRSKYTSP-UHFFFAOYSA-N Arsenious Acid Chemical compound O1[As]2O[As]1O2 GOLCXWYRSKYTSP-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 150000002505 iron Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000031068 symbiosis, encompassing mutualism through parasitism Effects 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Images
Classifications
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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
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
-
- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- 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
Abstract
The invention relates to a method for solidifying calcium arsenate slag cement, and belongs to the field of solid waste treatment. The invention mixes the calcium arsenate slag with adhesives such as asphalt to prepare particles, then mixes the particles with river sand or water slag and calcium arsenate particles, and uses cement to solidify. The method can realize permanent, stable and harmless treatment of the arsenic slag. The method has the advantages of simple operation, low reaction temperature, stable performance of the generated calcium-arsenic slag, low treatment cost, small dosage, low leaching toxicity and the like, and is very suitable for safe disposal and stockpiling and safe landfill of the calcium arsenate slag.
Description
Technical Field
The invention belongs to the field of solid waste treatment, and particularly relates to a method for solidifying calcium arsenate slag cement.
Background
Heavy metal ores in non-ferrous metals generally have multi-metal symbiosis, wherein lead, zinc, copper and tin are rich in harmful substances such as sulfur, arsenic and the like, and sulfur is collected and treated by acid preparation in the non-ferrous metal smelting process. The anode mud generated by copper electrolysis contains high toxic arsenic, which poses great threat to the production and life of people. As the anode mud can be treated by an alkaline method to convert arsenic into calcium arsenate with relatively stable property, the anode mud is arsenic-containing solid waste, and the calcium arsenate generated by chemical precipitation has strong toxicity and fine particles, generates toxic smoke dust when being piled up, generates anti-dissolution when meeting acid, generates low-valence arsenate with higher solubility in water, and pollutes river water and underground water. Therefore, the further treatment of the calcium arsenate slag is necessary.
At present, two types of methods are mainly used for treating calcium arsenate slag, one is to form arsenate with lower solubility and more stability in air through the reaction of arsenic and salts such as calcium, iron, aluminum and the like, and then realize permanent harmless treatment by using a cement curing method. The other is to use the calcium arsenate slag to prepare useful products to realize resource recycling.
The Linhonghan et al disclose a method of adding calcium salt and iron salt to arsenic sulfide filter cake at normal temperature to convert it into arsenate and solidifying it with cement (Linhonghan, xu tao, Liao Yuan Hang, etc. a method of transforming arsenic sulfide slag in copper smelting and combining with arsenic solidification [ Z ]. CN 110394354A). Wangyonghao Zhang shou, etc. disclose a method for preparing scorodite by oxidizing arsenic slag or arsenic alkali slag and adding ferrous salt (Wangyonghao, Limingyang, Wangyongjing, etc., a method for converting arsenic slag into scorodite by one step [ Z ]. CN111039327A, Zhang shou Chun, Zhang nan, Zheng Yajie, etc., a method for stabilizing arsenic alkali slag to prepare scorodite [ Z ]. CN 109809494A). Zhang et al, a method for preparing arsenolite by leaching arsenic sulfide slag with a mixed solution of aluminum sulfate and hydrogen peroxide (Zhang, Liming Yang, Liu Feng, a method for stabilizing arsenic-containing waste slag and recovering sulfur from arsenic-containing waste slag [ Z ]. CN 110407250A). G.delmoprolos harmless treatment by encapsulating arsenic slag with mineralized product of hydrolyzed aluminum gel formed by partial neutralization of a1 (SO 4) 1.5 with carbonate. However, the method has the disadvantages of large dosage of added medicament, large weight increasing ratio and capacity increasing ratio, large storage area of an enterprise, high transportation and landfill cost, great economic pressure of enterprise treatment and difficulty in wide popularization and application.
Disclosure of Invention
The invention mixes the calcium arsenate slag with binders such as asphalt and the like to prepare particles, adds river sand or water slag as aggregate to mix with the calcium arsenate particles, and mixes the calcium arsenate particles of the mixed aggregate with cement to carry out curing treatment. The method can realize permanent, stable and harmless treatment of the arsenic slag. The method has the advantages of simple operation, low reaction temperature, stable performance of the generated calcium-arsenic slag, low treatment cost, small dosage, low leaching toxicity and the like, and is very suitable for safe disposal and stockpiling and safe landfill of the calcium arsenate slag.
In order to realize the purpose, the invention is realized by the following technical scheme:
the method for solidifying the calcium arsenate slag cement comprises the following steps:
a) mixing the calcium arsenate slag with a binder to prepare particles;
b) adding river sand or water slag and mixing with calcium arsenate particles;
c) mixing the calcium arsenate particles mixed with river sand or water slag with cement for curing treatment.
Further preferably, the calcium arsenate slag is a calcium arsenate powdery material produced in the copper smelting process and the anode mud treatment.
Further preferably, in step a), the binder is asphalt, low density polyethylene or clay. The asphalt is the commercial national standard No. 10 asphalt or other grade asphalt.
Further preferably, in the step a), the mass ratio of the calcium arsenate slag to the binder is 1:1-10: 1;
further preferably, in the step a), the particle size of the granules prepared by mixing the calcium arsenate slag and the binder is 0.5-3 mm.
Further preferably, in the step b), the mass ratio of the calcium arsenate slag to the water granulated slag or river sand is 0:1-1: 1.
Further preferably, in the step c), the mass ratio of the calcium arsenate particles of the mixed river sand or the water granulated slag to the cement is 1: 0.2-2.0.
Further preferably, in the step c), the curing time of the cement is 15-28 days.
The invention has the beneficial effects that:
the invention adopts asphalt, low density polyethylene or clay as a binder for granulation, and considers a plurality of factors such as cost, durability, material mixing, binding and wrapping performance and cement solidified body stability. The asphalt not only plays a role of a binder, but also plays a role of wrapping arsenic slag and solidifying the arsenic slag, the asphalt granulation and cement solidification play a role of secondary solidification, and the asphalt granulation and cement solidification has promotion effects on the strength, the durability and the stability of a solidified body and the long-term stability of the wrapping performance of the arsenic material. The sandstone and the water slag are added, one is to increase the air permeability of the solidified body and increase the strength of the solidified body, and the water slag is also an arsenic-containing material, so that the comprehensive utilization effect is achieved. The proportion of the calcium arsenate slag particles and the cement is obtained through experimental research, and the strength of a solidified body of the calcium arsenate slag particles reaches more than 10 MPa.
The method can realize permanent, stable and harmless treatment of the arsenic slag. The method has the advantages of simple operation, low reaction temperature, stable performance of the generated calcium-arsenic slag, low treatment cost, small dosage, low leaching toxicity and the like, and is very suitable for safe disposal and stockpiling and safe landfill of the calcium arsenate slag.
Drawings
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a photograph showing the appearance of a calcium arsenate slag sample as a raw material in an example of the present invention;
FIG. 3 is an SEM image of a calcium arsenate slag sample as a raw material in an embodiment of the invention;
FIG. 4 is an XRD pattern of a calcium arsenate slag sample as a raw material in an embodiment of the invention;
FIG. 5 is a photograph showing the appearance of the calcium arsenate granulated sample provided in the example.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, preferred embodiments of the present invention will be described in detail below to facilitate understanding of the skilled person.
The distribution of the individual particles of the water-granulated slag components used in the examples is shown in the following table.
TABLE 1 chemical analysis results (wt%) of water granulated slag components
| As | SiO2 | Fe | CaO | Zn | Ag(g/t) | Pb | S |
| 0.016 | 28.9 | 27.7 | 9.65 | 7.83 | 1.3 | 0.15 | 0.037 |
TABLE 2 particle size distribution of water granulated slag
| Particle size range | +3mm | +0.15mm~-3mm | -0.15mm | Total up to |
| Content/% | 3.46 | 93.95 | 2.59 | 100.00 |
Example 1
30g of calcium arsenate slag and 30g of asphalt are taken, the temperature is controlled to be 150 ℃, and the calcium arsenate slag, the asphalt and the asphalt are mixed, stirred and cooled to be prepared into particles (the particle size is 0.5-3 mm). Taking 6g of 425# cement, mixing and stirring uniformly with calcium arsenate particles, standing and preserving for 28 days. And (3) detecting the leaching concentration of arsenic according to the national standard (HJ/T299-2007), wherein the leaching concentration of arsenic is 0.208mg/L, the strength detection result is 17.8MPa, and the national emission standard is achieved.
Example 2
30g of calcium arsenate slag and 30g of asphalt are taken, the temperature is controlled to be 150 ℃, and the calcium arsenate slag, the asphalt and the asphalt are mixed, stirred and cooled to be prepared into particles (the particle size is 0.5-3 mm). Taking 30g of river sand and 60g of 425# cement, mixing and stirring uniformly with calcium arsenate particles, standing and preserving health for 28 days. And (3) detecting the leaching concentration of arsenic according to the national standard (HJ/T299-2007), wherein the leaching concentration of arsenic is 0.011mg/L, and the strength detection result is 50.1MPa, so that the national emission standard is reached.
Example 3
30g of calcium arsenate slag and 3g of asphalt are taken, the temperature is controlled to be 150 ℃, and the calcium arsenate slag, the asphalt and the asphalt are mixed, stirred and cooled to be prepared into particles (the particle size is 0.5-3 mm). Taking 6g of 425# cement, mixing and stirring uniformly with calcium arsenate particles, standing and preserving for 28 days. And (3) detecting the leaching concentration of arsenic according to the national standard (HJ/T299-2007), wherein the leaching concentration of arsenic is 0.627mg/L, and the strength detection result is 13.7MPa, so that the national emission standard is reached.
Example 4
30g of calcium arsenate slag and 3g of asphalt are taken, the temperature is controlled to be 150 ℃, and the calcium arsenate slag, the asphalt and the asphalt are mixed, stirred and cooled to be prepared into particles (the particle size is 0.5-3 mm). 30g of water slag and 60g of 425# cement are mixed with calcium arsenate particles and stirred uniformly, and then the mixture is kept stand and cured for 28 days. And (3) detecting the leaching concentration of arsenic according to the national standard (HJ/T299-2007), wherein the leaching concentration of arsenic is 0.05mg/L, and the strength detection result is 26.9MPa, so that the national specified emission standard is reached.
Example 5
30g of calcium arsenate slag and 30g of polyethylene are taken, the temperature is controlled to be 150 ℃, and the calcium arsenate slag, the polyethylene and the polyethylene are mixed, stirred and cooled to be prepared into particles (the particle size is 0.5-3 mm). 60g of 425# cement is taken, mixed with calcium arsenate particles and stirred uniformly, and then kept stand for 28 days. And (3) detecting the leaching concentration of arsenic according to the national standard (HJ/T299-2007), wherein the leaching concentration of arsenic is 0.72mg/L, and the strength detection result is 30.1MPa, so that the national specified emission standard is reached.
Example 6
30g of calcium arsenate slag and 30g of clay are taken, and water is added for mixing and stirring to prepare particles (the particle size is 0.5-3 mm). 60g of 425# cement is taken, mixed with calcium arsenate particles and stirred uniformly, and then kept stand for 28 days. And (3) detecting the leaching concentration of arsenic according to the national standard (HJ/T299-2007), wherein the leaching concentration of arsenic is 0.88mg/L, and the strength detection result is 23.2MPa, so that the national specified emission standard is reached.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (7)
1. A method for curing calcium arsenate slag cement is characterized by comprising the following steps: the method comprises the following steps:
a) mixing the calcium arsenate slag with a binder to prepare particles;
b) adding river sand or water slag and mixing with calcium arsenate particles;
c) mixing the calcium arsenate particles mixed with river sand or water slag with cement for curing treatment.
2. The method for setting the calcium arsenate slag cement according to claim 1, wherein: the calcium arsenate slag is a calcium arsenate powdery material produced by anode mud treatment in the copper smelting process.
3. The method of setting calcium arsenate slag cement according to claim 1 or 2, wherein: in step a), the binder is asphalt, low density polyethylene or clay.
4. The method of claim 1 or 3, wherein the calcium arsenate slag cement is set by: in the step a), the mass ratio of the calcium arsenate slag to the binder is 1:1-10: 1;
the method for setting the calcium arsenate slag cement according to claim 4, wherein: in the step a), the granularity of the particles prepared by mixing the calcium arsenate slag and the adhesive is 0.5-3 mm.
5. The method for setting the calcium arsenate slag cement according to claim 1, wherein: in the step b), the mass ratio of the calcium arsenate slag to the water granulated slag or river sand is 0:1-1: 1.
6. The method for setting the calcium arsenate slag cement according to claim 1, wherein: in the step c), the mass ratio of the calcium arsenate particles of the mixed river sand or the water granulated slag to the cement is 1: 0.2-2.0.
7. The method for setting the calcium arsenate slag cement according to claim 1, wherein: in the step c), the curing time of the cement is 15-28 days.
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