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Technology for normal-temperature wet-process harmless treatment of arsenic soda slag

A technology of harmless treatment and arsenic-alkali residues, which can be applied to the improvement of process efficiency, chemical instruments and methods, and the removal of solid waste, etc., and can solve the problems of low product quality, difficult automation of equipment, and difficult waste water treatment. Achieve the effect of good process stability, guarantee of occupational hygiene, and improvement of recovery rate

Active Publication Date: 2017-01-11
HUNAN CHENZHOU MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the production practice shows that the above processes have the following problems: ①The material is easy to crystallize and scale, the solid-liquid separation is difficult, and the equipment is difficult to automate; ②The process stability is poor, the recovery rate of arsenic is not high, and the waste water is difficult to treat; ③The product quality is not high. , Poor sales; ④Arsenate is easy to volatilize and decompose at high temperature, the operating environment is poor, and occupational hygiene is difficult to guarantee

Method used

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  • Technology for normal-temperature wet-process harmless treatment of arsenic soda slag
  • Technology for normal-temperature wet-process harmless treatment of arsenic soda slag
  • Technology for normal-temperature wet-process harmless treatment of arsenic soda slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Crush the arsenic-alkali slag containing 16.10% arsenic and 22.99% antimony to ensure that the particle size is below 5mm, weigh 100g, add 400g water and stir, and react at a temperature of about 25°C for 1 hour. Then filter and dry the filter residue, the weight of the residue is 32g, the grades of antimony and arsenic in the residue are analyzed, and they are respectively: antimony 69.0%, arsenic 1.5%, the calculation shows that the recovery rate of antimony reaches 96.0%, and the leaching rate of arsenic reaches 97.0%.

Embodiment 2

[0033] Grind arsenic-alkali residue containing 15.97% arsenic and 20.10% antimony, sieve to ensure that the particle size is below 5mm, weigh 100g, add 400g water and stir, and react at a temperature of about 25°C for 1 hour. Then filter and dry the filter residue, the weight of the residue is 29g, the grades of antimony and arsenic in the residue are analyzed, they are respectively: antimony 66.9%, arsenic 1.5%, the calculation shows that the recovery rate of antimony reaches 96.5%, and the leaching rate of arsenic reaches 97.3%.

Embodiment 3

[0035] First add 20 g of concentrated sulfuric acid to the obtained high-arsenic leach solution of Example 1 (after adding the acid solution, its pH value is 2-3), then add 6 g of biological preparations, stir for 10 minutes, then add 1.6 g of industrial hydrogen peroxide, stir for 10 minutes, Finally, milk of lime was added to adjust the pH value to 14, and filtered to obtain a section of effluent and high-arsenic slag. The obtained section of effluent was firstly added with 4g of concentrated sulfuric acid, then 4g of biological agent, stirred for 10 minutes, and then 1.6g of industrial hydrogen peroxide, stirred for 10 minutes, and finally Add lime milk to adjust the pH value to 14, and filter to obtain the second-stage effluent and high-arsenic slag. The main comprehensive indicators of the second-stage effluent:

[0036]

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Abstract

The invention belongs to the field of wet metallurgy and relates to a treatment method of arsenic soda slag produced in a pyrogenic antimony smelting process. The arsenic soda slag is subjected to wet crushing, water is added in the normal-temperature state, the mixture is subjected to solid-liquid separation, metal antimony in the slag is recovered, a high-arsenic leaching liquid after solid-liquid separation is subjected to arsenic precipitation with concentrated sulfuric acid, a biological agent, hydrogen peroxide and lime milk, and water after arsenic removal reaches the standard to be discharged. Produced high-arsenic slag is detoxicated through addition of a crystallization agent, and then a solidified body is prepared through addition of a solidification agent and can reach toxic leaching requirements of general solid waste according to a toxic leaching test. With the technology, environmental pollution caused by storage of the arsenic soda slag can be greatly reduced, the comprehensive utilization rate of mineral resources can be increased, and the valuable metal recovery rate is high. Through one-year production practice, various substances can be effectively recycled at the normal temperature with the technology, and As can be efficiently fixed. Material recrystallization does not occur in the whole technological process, so that the whole technology can be conducted smoothly, and necessary conditions are provided for industrial application.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy and relates to a treatment method for arsenic-alkali slag produced in the pyrometallurgy process. Background technique [0002] In the industrial production of antimony smelting, the crude antimony is refined by adding soda ash or caustic soda, and various numbers of refined antimony are produced while producing arsenic-alkali slag. However, in the long-term antimony smelting process, due to technical reasons, the disposal of arsenic-alkali slag has not reached the level of harmless and clean production. There are many topics to be studied, and it has positive practical significance. [0003] At present, the domestic production process for treating arsenic-alkali slag is mainly as follows: because sodium carbonate and sodium arsenate in arsenic-alkali slag can be dissolved in water, sodium thioantimonate can be dissolved in alkali; sodium antimonite and sodium antimonate are slightly soluble Metal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B30/02C22B30/04B09B3/00
CPCC22B7/006C22B7/04C22B30/02C22B30/04B09B3/80Y02P10/20
Inventor 王亲雄黄启富李中平刘勇沈吉峰阳振球邓必旭
Owner HUNAN CHENZHOU MINING CO LTD
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