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Treatment method for arsenic-alkali residue

A treatment method, the technology of arsenic-alkali slag, applied in the field of hydrometallurgy, can solve the problems of unstable leaching effect, difficult industrial application, and difficult solid-liquid separation, and achieve the effect of low difficulty of solid-liquid separation and reduction of the proportion of fine particles

Active Publication Date: 2018-01-26
HUNAN CHENZHOU MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The existing arsenic-alkali slag leaching method is generally to first dry the arsenic-alkali slag, crush it and then leaching; the existing treatment process is complex, the leaching effect is unstable, and the solid-liquid separation is difficult. The actual operation of the process is difficult, and it is difficult for industrial Application; In order to overcome the technical problems encountered in the prior art, the inventors have found through a lot of research that the dynamic leaching of the arsenic-alkali slag directly by using a self-falling stirring device helps to significantly simplify the leaching operation, it also helps to significantly improve the leaching effect; in addition, combined with the after-treatment method, the treatment effect of arsenic-alkali slag can be greatly improved

Method used

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  • Treatment method for arsenic-alkali residue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Weigh 100kg of arsenic-alkali slag containing 16.10% of arsenic and 22.99% of antimony, add 150kg of water to soak for 68 hours, put it into a self-falling concrete mixer and add 250kg of water to stir at a temperature of about 25°C (stirring speed is 15-18r / min ) to react for 1 hour. Then after natural precipitation, the supernatant was taken out, and the antimony fine slag at the bottom was naturally air-dried. The dry weight of the slag was 32kg. The grades of antimony and arsenic in the analysis slag were: antimony 70.0%, arsenic 1.4%, and the calculation shows that the recovery rate of antimony reached 97.4%. %, the leaching rate of arsenic reaches 97.2%.

Embodiment 2

[0083]Weigh 100kg of arsenic-alkali slag containing 16.10% of arsenic and 22.99% of antimony, add 150kg of water to soak for 72 hours, put it into a self-falling concrete mixer and add 250kg of water to stir at a temperature of about 25°C (stirring speed is 15-18r / min ) to react for 1 hour. After natural precipitation, the supernatant was taken out, and the antimony fine residue at the bottom was naturally air-dried. The dry weight of the residue was 29kg. The grades of antimony and arsenic in the residue were analyzed, and they were respectively: antimony 77.9%, arsenic 1.3%, and the calculation showed that the recovery rate of antimony reached 98.26%. %, the leaching rate of arsenic reaches 97.66%.

Embodiment 3

[0085] Weigh 100kg of arsenic-alkali slag containing 16.10% of arsenic and 22.99% of antimony, put it into a self-falling concrete mixer and add 400kg of water for stirring (stirring speed is 15-18r / min) and react for 1 hour. After natural precipitation, the supernatant was taken out, and the antimony fine residue at the bottom was naturally air-dried. The dry weight of the residue was 34kg. The grades of antimony and arsenic in the analysis residue were: antimony 61%, arsenic 2.9%, and the calculation showed that the recovery rate of antimony reached 90.21%. %, the leaching rate of arsenic reaches 93.88%. The arsenic-alkali slag was not pre-soaked, and the leaching rate was slightly worse than that of Example 2.

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Abstract

Provided is an arsenic-containing waste residue normal temperature wet method innocent treatment process. After arsenic-containing waste residue is subjected to wet type crushing, water is added to the arsenic-containing waste residue under the normal temperature condition to recycle metallic antimony in the arsenic-containing waste residue through solid-liquid separation, arsenic-rich leaching solutions after solid-liquid separation are subjected to arsenic precipitation with concentrated sulfuric acid, biological agents, hydrogen peroxide and lime milk, and up-to-standard discharge of wateris realized after dearsenification. Produced arsenic residue is made into a solidified body by adding crystallization agents to detoxify and then adding curing agents. The toxicity leaching test of the solidified body can reach the toxicity leaching requirement of general solid waste. The process can greatly reduce environmental pollution brought by accumulation of arsenic-containing waste residue, the comprehensive utilization rate of mineral resources is improved, and the recovery rate of valuable metal is high. After production practice of one year, the recovery rate of antimony is verifiedto be stably more than 90%.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy and relates to a treatment method for arsenic-containing waste residue produced in the process of pyrometallurgy. Background technique [0002] In the production of smelting industry, adding soda ash or caustic soda is used to refine crude antimony, and various numbers of refined antimony are produced while arsenic-containing waste residue is produced. However, in the long-term antimony smelting process, due to technical reasons, the disposal of arsenic-containing waste residues has not reached the level of harmless and clean production. There are many topics that need to be studied and have positive practical significance. [0003] The arsenic-containing waste residue contains arsenic and antimony; the sodium carbonate and sodium arsenate contained in the arsenic waste residue are soluble in water, and sodium thioantimonate is soluble in alkali; while sodium antimonite and sodium antimonate are sli...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B30/02C22B30/04
CPCY02P10/20
Inventor 王亲雄沈吉峰
Owner HUNAN CHENZHOU MINING CO LTD
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