Method for recovering elementary substance arsenic from arsenic sulfide slag

A technology of arsenic sulfide and recycling bills, applied in the direction of improving process efficiency, etc., can solve the problem of high cost

Active Publication Date: 2015-06-17
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the treatment and disposal methods for arsenic-containing waste residues at home and abroad mainly include solidification / stabilization landfill, production of building materials, recovery of arsenic and recovery of valuable metals, etc., but the cost is high. How to dispose of such waste residues at low cost and high efficiency It is a difficult problem at home and abroad

Method used

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  • Method for recovering elementary substance arsenic from arsenic sulfide slag
  • Method for recovering elementary substance arsenic from arsenic sulfide slag

Examples

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Embodiment 1

[0031] A method for recovering elemental arsenic from arsenic sulfide slag, comprising a two-stage process "oxidative desulfurization leaching-acidification reduction", the specific steps are as follows:

[0032] (1) Take 5g of arsenic sulfide slag in a 250mL Erlenmeyer flask, add 100mL of distilled water, place the Erlenmeyer flask in a water bath and heat it to 75°C and keep it constant; add sodium hydroxide powder under stirring until the pH of the solution is 8-9; Then add 35mL of 30% hydrogen peroxide dropwise at a constant speed, and finish dripping in 40 minutes. After the dropping, rinse the bottle wall with a small amount of distilled water so that the liquid volume does not exceed 150mL. Continue to stir and react for 6 hours. The elemental sulfur generated during the reaction will have a large amount of conjunctiva. , rinsed repeatedly with distilled water, and the liquid volume was about 200mL after the reaction;

[0033] (2) After the reaction is completed, filter...

Embodiment 2

[0036] A method for recovering elemental arsenic from arsenic sulfide slag, comprising a two-stage process "oxidative desulfurization leaching-acidification reduction", the specific steps are as follows:

[0037](1) Take 10g of arsenic sulfide slag in a 500mL Erlenmeyer flask, add 200mL of distilled water, place the Erlenmeyer flask in a water bath and heat it to 75°C and keep it constant; add sodium hydroxide powder under stirring until the solution pH=8~9; Then add 70mL of 30% hydrogen peroxide dropwise at a constant speed, and finish dripping in 40 minutes. After the dropping, rinse the bottle wall with a small amount of distilled water so that the liquid volume does not exceed 300mL, and continue to stir for 6 hours. The elemental sulfur generated during the reaction will have a large amount of conjunctiva. , rinsed repeatedly with distilled water, and the liquid volume was about 400mL after the reaction;

[0038] (2) After the reaction is completed, filter with medium-spe...

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Abstract

The invention belongs to the field of comprehensive utilization and processing technologies for arsenious waste slag, and particularly discloses a method for recovering elementary substance arsenic from arsenic sulfide slag, namely a desulphurization oxidation extract-acidification reduction technology. The method comprises steps of adding the arsenic sulfide slag in a water bath and heating to a certain temperature, adding an alkaline substance and controlling pH to be 8-9, and adding hydrogen peroxide slowly to react for 6h; and filtering to obtain an arsenic-rich solution, adding concentrated hydrochloric acid, adding stannous chloride for reduction to obtain the elementary substance arsenic, and drying to obtain the arsenic having a purity of higher than 98%. The method has advantageous of short technological process, easily controllable operation conditions, capability of convert arsenic from the arsenic sulfide slag into elementary substance arsenic, arsenic recovery rate of 99%, simple equipment, largely reduced cost for arsenic recovery, and significant economic benefit and environmental protection benefit.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization and treatment of arsenic-containing waste residues, in particular to a method for recovering elemental arsenic from arsenic sulfide residues. Background technique [0002] Arsenic is not only a highly toxic substance, but also an indispensable resource in the development of the national economy. Due to mining over the years, arsenic ore resources are relatively scarce. Arsenic has special uses in the fields of agriculture, electronics, medicine, metallurgy, chemical industry, etc. It can be used to prepare herbicides and insecticides, wood preservatives, glass clarifying and decolorizing agents, non-ferrous metal alloys, ceramics, etc., especially in the fields of optoelectronics and microelectronics The demand for arsenic in China is increasing. In the process of using smelting flue gas to produce sulfuric acid, a large amount of dilute acid wastewater containing arsenic, cadm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B30/04C22B3/44
CPCY02P10/20
Inventor 杜冬云崔洁郭莉刘芫
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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