Method for stabilizing arsenic-calcium slag

A technology of calcium slag and waste slag is applied in the field of stabilization of arsenic calcium slag, which can solve the problems of low cost and achieve the effect of low cost and good stabilization effect.

Active Publication Date: 2019-12-24
SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention provides a method for stabilizing arsenic-calcium slag. The method provided by the invention solves the problem that a large amount of secondary arsenic-containing solid waste is generated when cement is used to solidify arsenic-calcium slag. better effect

Method used

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  • Method for stabilizing arsenic-calcium slag
  • Method for stabilizing arsenic-calcium slag
  • Method for stabilizing arsenic-calcium slag

Examples

Experimental program
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Effect test

Embodiment 1

[0044] The arsenic-containing waste liquid is subjected to lime precipitation treatment to obtain arsenic-calcium slag. The treatment method is: adding calcium oxide to the arsenic-containing waste liquid, reacting for 10 hours, filtering, collecting solids, and obtaining arsenic-calcium slag.

[0045] Mix 40 g of calcium arsenic slag with 400 ml of water to obtain a mixed slurry of calcium arsenic slag, wherein the content of arsenic in the calcium arsenic slag is 5.86wt.%; add 14 mL of ferric nitrate solution dropwise to the calcium arsenic slag mixed slurry under mechanical stirring, The molar ratio of the iron in the ferric nitrate solution to the arsenic in the arsenic-calcium slag is 0.7. After the dropwise addition is completed, the compounding reaction is continued, and the pH value of the compounding reaction process is always controlled at 7 by acid or alkali. Detect the arsenic content in the reaction system slurry (As content detection method is: use potassium boro...

Embodiment 2

[0054] Mix 40 g of calcium arsenic slag with 400 ml of water to obtain a mixed slurry of calcium arsenic slag, wherein the content of arsenic in the calcium arsenic slag is 5.86wt.%. Under mechanical stirring, 14 mL of ferric nitrate solution is added dropwise to the calcium arsenic slag mixed slurry, The molar ratio of the iron in the ferric nitrate solution to the arsenic in the arsenic-calcium slag is 0.7. After the dropwise addition is completed, the compounding reaction is continued, and the pH value of the compounding reaction process is always controlled at 8 by acid or alkali. According to the method in Example 1, the arsenic concentration of the slurry on the 15th day after the compounding reaction was detected, and the arsenic concentration was only 12.61 mg / L, indicating that the formation of calcium iron arsenate effectively reduced the leaching of arsenic. The changes of arsenic concentration before and after treatment when the pH value was 8 are shown in Table 3....

Embodiment 3

[0064] Mix 40 g of calcium arsenic slag with 400 mL of water to obtain a mixed slurry of calcium arsenic slag, wherein the content of arsenic in the calcium arsenic slag is 5.86 wt. %; add 14 mL of ferric nitrate solution dropwise to the calcium arsenic slag mixed slurry under mechanical stirring, The molar ratio of the iron in the ferric nitrate solution to the arsenic in the arsenic-calcium slag is 0.7. After the dropwise addition is completed, the compounding reaction is continued, and the pH value of the compounding reaction process is always controlled at 9 by acid or alkali. After stabilizing for a period of time, the filtered arsenic-calcium slag was tested according to the method in Example 1, and the obtained test results are shown in Table 5: according to the method in Example 1, the arsenic concentration of the slurry after the compounding reaction was detected, and it was obtained The arsenic concentration on the 15th day of the compounding reaction was only 14.56 ...

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Abstract

The invention belongs to the technical field of arsenic-containing waste residue treatment, and provides a method for stabilizing arsenic-calcium slag, which comprises the following steps: mixing thearsenic-calcium slag, water-soluble ferric salt and water to obtain a mixture; adjusting the pH value of the mixture to 2-13; and carrying out a combination reaction on the mixture to generate iron calcium arsenate so as to complete stabilization treatment of the arsenic calcium slag, wherein the molar ratio of iron to arsenic in the mixture is 0.1-13:1. According to the method provided by the invention, the arsenic in the arsenic-calcium slag can be effectively stabilized by controlling the molar ratio of iron to arsenic and the pH value of the mixture, and the leaching rate of the arsenic inthe arsenic-calcium slag treated by the method is relatively low.

Description

technical field [0001] The invention relates to the technical field of arsenic-containing waste slag treatment, in particular to a method for stabilizing arsenic-calcium slag. Background technique [0002] In the smelting and production process of non-ferrous heavy metals, the oxidative acid leaching of heavy metals containing arsenic will produce a large amount of polluted acid containing arsenic. The arsenic content in the polluted acid is extremely high and must be treated for arsenic removal and arsenic fixation. At present, the commonly used arsenic-containing sewage acid treatment methods in my country's nonferrous smelting industry mainly include lime precipitation method and lime neutralization iron-arsenic co-precipitation method. Among them, the lime precipitation method has the advantages of simple process and low cost; the iron-arsenic co-precipitation method can only be used to stabilize the dissolved arsenic in the solution, thus making the lime precipitation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00
CPCC01G49/009C01P2002/72C01P2004/03
Inventor 贾永锋王雨萌马旭王少锋
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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