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Method for curing arsenic-containing waste residues through industrial waste residues

A technology of industrial waste residue and waste residue, which is applied in the field of arsenic pollution control, can solve the problems of high processing cost, poor stability, and inability to separate arsenic, and achieve the effect of strengthening the effect of arsenic fixation and improving stability

Active Publication Date: 2016-05-04
HUNAN RES INST FOR NONFERROUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The calcium salt stabilization method has low treatment cost and simple process. It is the most commonly used stabilization method at present, but it also has disadvantages such as high consumption of chemicals and large amount of slag, especially the high solubility of calcium salt and poor stability in the air. Industrialization Limited application prospects
The iron salt has a better stabilization effect, but it has the disadvantages of large consumption of chemicals and high processing cost
The sulfuration stabilization method is simple to operate and has a good treatment effect, but the generated arsenic sulfide has the disadvantage of low long-term stability in the environment
And for high-arsenic waste residue, it is difficult to achieve effective stabilization of arsenic by ordinary stabilization methods.
Chinese patent application No. 201110024560.7 discloses a method for treating arsenic sulfide slag: first add inorganic flocculant to arsenic sulfide slag, stir evenly; then add solid powder adsorbent, stir evenly; finally add asbestos wool and stir, The leaching toxicity of arsenic after treatment reaches the standard, but this method needs to use a large amount of inorganic flocculant and solid powder adsorbent, which makes its cost relatively high
Therefore, at present, the stabilization treatment methods cannot realize the separation of arsenic under the premise of low-cost solidified arsenic and arsenic stability, especially for arsenic-containing waste with complex properties and high arsenic content.

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Experimental program
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Effect test

Embodiment 1

[0026] A method of the present invention for solidifying arsenic-containing waste slag by using industrial waste slag, the object of treatment is arsenic sulfide slag from a copper smelter, the main chemical components and leaching toxicity analysis of the arsenic sulfide slag are shown in Table 1, Table 2 and Table 3 respectively Shown, specifically include the following steps:

[0027] (1) Raw material preparation: the tailings after the copper smelting slag flotation copper of the copper smelter is obtained by magnetic separation to obtain the magnetic separation iron concentrate, for subsequent use; the Fe in the magnetic separation iron concentrate 3 o 4 The mass fraction is 80%, and the particle size is -400 mesh. The neutralized slag produced by adding lime milk to neutralize the smelter in the sewage acid treatment or wastewater treatment process is crushed to a particle size of less than 0.5cm, and dried at 200°C for 2 hours to an anhydrous state for later use.

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Embodiment 2

[0041] A method of using industrial slag to solidify arsenic-containing waste slag according to the present invention, the object of treatment is arsenic sulfide slag from a copper smelter, the main chemical components and leaching toxicity analysis of the arsenic sulfide slag are shown in Table 4, Table 5 and Table 6 respectively Shown, specifically include the following steps:

[0042] (1) Raw material preparation: ball mill the tailing sand after the copper smelting slag flotation copper in the copper smelter until the particle size is -800 mesh, and set aside. The neutralized slag was crushed to a particle size of less than 0.5 cm, dried at 200°C for 2 hours to anhydrous state, and set aside.

[0043](2) Pretreatment of arsenic-containing waste slag: put arsenic-containing waste slag into a stirring tank and add water to slurry to form a slurry. The concentration of slag in the slurry is 20%, and the pH value of the slurry is 2.

[0044] (3) fix arsenic: add the tailings ...

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Abstract

The invention discloses a method for curing arsenic-containing waste residues through industrial waste residues. The method includes the following steps that (1) the arsenic-containing waste residues are thrown into a stirring tank, and water is added for slurrying, so that slurry is obtained; (2) an arsenic curing agent is added into the stirring tank for a curing reaction, and the arsenic curing agent is smelting slag or magnetic iron concentrate obtained through ball-milling and magnetic separation of smelting slag; and (3) neutralizing slag is added into the stirring tank for stirring, and finally casting molding and natural curing are conducted, so that solid arsenic products are obtained. According to the method, the waste residues generated by a nonferrous metal smelting plant are utilized, the material cost is basically zero, and meanwhile the excellent effect of dealing with waste by waste can be achieved. Through the method for treatment the arsenic-containing waste residues, the curing rate of arsenic in the arsenic-containing waste residues reaches 94% or more.

Description

technical field [0001] The invention relates to a method for treating arsenic pollution, in particular to a method for solidifying arsenic-containing waste slag by using industrial waste slag (smelting slag, neutralization slag). Background technique [0002] According to statistics, my country produces about 500,000 tons of arsenic-containing waste slag annually, and more than 2 million tons of arsenic-containing waste slag are hoarded. The stacking of arsenic-containing solid waste has caused serious potential pollution to the local soil and water environment, affecting the health of local or river basin residents. Therefore, efficient and safe disposal of arsenic-containing waste residues has become an urgent problem to be solved. [0003] At present, the harmless treatment technologies of arsenic-containing wastes at home and abroad mainly include conversion extraction technology, stabilization technology, and solidification technology. Among them, the stabilization te...

Claims

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Application Information

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IPC IPC(8): B09B3/00B09B5/00
CPCB09B3/00B09B5/00B09B3/20
Inventor 曹柏林黄斌
Owner HUNAN RES INST FOR NONFERROUS METALS
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