Process of extracting arsenic from arsenic sulfide waste residue by adopting whole wet method

An arsenic sulfide, all-wet technology, applied in the field of arsenic sulfide waste residue treatment, can solve the problems of short process flow, reduce the use cost, improve the recovery effect, and solve the problem of acid expansion

Active Publication Date: 2017-08-04
郴州金铖环保科技有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the technical defects existing in the existing process for treating arsenic-sulfur waste residue, the purpose of the present invention is to provide a process with short process flow, economical and practical, good operating environment, closed loop solution, and clean disposal of arsenic-sulfide waste residue. Not only can arsenic be recovered as arsenic trioxide product, but also solve the problem of acid expansion, which is conducive to industrial popularization and application

Method used

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  • Process of extracting arsenic from arsenic sulfide waste residue by adopting whole wet method

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Experimental program
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Effect test

Embodiment 1

[0033] according to figure 1 Process steps, take 100g of arsenic filter cake, add oxygen leaching solution (containing H 2 SO 4 80g / L, pentavalent arsenic 20g / L) 500mL, its liquid-solid ratio is 5L: 1kg, the reaction temperature is 85 ℃, mechanical stirring, the reaction is 1 hour, hot filtration, the solution is cooled to 10 ℃, can obtain As-containing 2 O 3 Up to 99.3% of arsenic trioxide solid, the reduction rate of pentavalent arsenic in the reduction process is 92.6%.

Embodiment 2

[0035] according to figure 1 Process step, get 50g of arsenic filter cake, add oxygen leaching solution (containing H 2 SO 4 100g / L, pentavalent arsenic 30g / L) 500mL, its liquid-solid ratio is 10L: 1kg, the reaction temperature is 90 ℃, mechanical stirring, the reaction is 0.5 hours, hot filtration, the leachate is cooled to 25 ℃, and the As-containing 2 O 3 Up to 99.2% of arsenic trioxide solid, the reduction rate of pentavalent arsenic in the reduction process is 96.3%.

Embodiment 3

[0037] according to figure 1 Process steps, take 160g of arsenic filter cake, add oxygen leaching solution (containing H 2 SO 4 160g / L, pentavalent arsenic 20g / L) 1000mL, its liquid-solid ratio is 25L: 4kg, the reaction temperature is 100 ℃, mechanical stirring, the reaction is 0.5 hours, hot filtration, cooled to 25 ℃, can obtain As-containing2 O 3 Up to 99.1% of arsenic trioxide solid, the reduction rate of pentavalent arsenic in the reduction process is 97.4%.

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Abstract

The invention discloses a process of extracting arsenic from arsenic sulfide waste residue by adopting the whole wet method. The process comprises the following steps: arsenic sulfide waste residue is subjected to oxygen pressure leaching and solid-liquid separation to obtain sulfur slag and an oxygen pressure leach solution containing pentavalent arsenic and H2SO4; arsenic sulfide waste residue is taken as a reducing agent to obtain pentavalent arsenic by reduction, and solid-liquid separation is carried out, so as to obtain a solution containing trivalent arsenic and a slag phase; the solution containing trivalent arsenic is subjected to cooling crystallization and drying to obtain a opaque glass product, and the slag phase is returned to be subjected to oxygen pressure leaching. The process has the advantages of being short in process flow, economic and practical, good in operating environment and capable of realizing closed circulation of the solution; arsenic and sulfur are recovered in the forms of a arsenic trioxide product and sulfur, the problem that the conventional SO2 reduction causes acid swelling is solved, and the industrial popularization and application are facilitated.

Description

technical field [0001] The invention relates to a method for treating arsenic sulfide waste residue, in particular to a clean disposal process for extracting and separating arsenic element from arsenic sulfide waste residue by a full wet method, belonging to the fields of non-ferrous metal extraction technology and environmental protection treatment. Background technique [0002] In the smelting process of copper and gold, the arsenic filter cake produced during the purification and washing of flue gas in the process of oxidative desulfurization of ore to produce acid is mainly arsenic sulfide (As 2 S 3 ) as the main slag, because the slag contains high arsenic and sulfur, it is difficult to handle, and many smelters are stacked. [0003] For arsenic-containing sulfur slag such as arsenic filter cake, the existing treatment process mainly includes fire oxidation roasting, which produces sulfur dioxide and arsenic trioxide. The sulfur dioxide flue gas produced by this method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B30/04C22B7/00
CPCC22B7/007C22B30/04Y02P10/20
Inventor 郭波平阮茗陈世民
Owner 郴州金铖环保科技有限公司
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