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A method for comprehensive recovery of arsenic-containing materials and arsenic resource utilization

A technology of resource utilization and materials, applied in the field of metallurgy, can solve the problems of untreated sodium arsenate, low recovery rate of valuable metals, complicated pH adjustment process, etc., to improve the quality of recovered products, high comprehensive utilization of resources, and adaptability to raw materials. wide range of effects

Active Publication Date: 2019-03-26
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN105648226A and CN105648227A disclose the method for realizing the separation of arsenic and antimony by oxygen pressure alkali leaching. The separation of arsenic and antimony is relatively thorough, but the sodium arsenate obtained in the process has not been treated, and valuable metals such as tellurium and antimony have not been recovered
The method has a long process flow, complex pH adjustment process and long reaction cycle
[0006] To sum up, there are many research papers and related patent reports on removing arsenic from dust and extracting valuable metals, but the existing technology still has low comprehensive recovery rate of valuable metals, limited market for arsenic products, and potential safety hazards. question

Method used

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  • A method for comprehensive recovery of arsenic-containing materials and arsenic resource utilization

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Taking arsenic-containing soot from a lead-zinc smelter in China as an example, the main components of the raw materials are Pb 1.57%, As48.56%, Sn0.51%, Sb 21.24%, Zn 0.73%, Te 0.35%, Se 0.25%, and the following steps are adopted deal with:

[0044] (1) Oxygen pressure water immersion: Weigh a certain quality of high arsenic and antimony fumes into the reactor, the control conditions are liquid-solid volume mass ratio 10:1, stirring speed 300r / min, leaching temperature 160°C, oxygen partial pressure 2Mpa, The leaching time is 2 hours. After the leaching is completed and the oxidation blowing temperature is 700°C, the slurry is removed and separated by filtration to obtain the leaching solution and leaching residue;

[0045] After testing: the arsenic leaching rate is 61.53%, and the concentration of each element in the leach solution is Pb 709.60ppm, Se31.02ppm, Sb1.26g / L, Te 123.28ppm, As 29.88g / L.

[0046] (2) Selective reduction and purification of leach solution: ...

Embodiment 2

[0053] Taking arsenic-containing soot from a lead-zinc smelter in China as an example, the main components of the raw material are Pb 6.88%, As36.51%, Sn1.11%, Sb 29.77%, Zn 0.54%, Te 0.24%, Se 0.05%, and the following steps are adopted deal with:

[0054] (1) Oxygen pressure water immersion: Weigh a certain quality of high arsenic and antimony fumes into the reactor, the control conditions are liquid-solid volume mass ratio 20:1, stirring speed 300r / min, leaching temperature 160°C, oxygen partial pressure 0.5Mpa , the leaching time is 2h, after the leaching is completed and the oxidation blowing temperature is 800°C, the slurry is removed and separated by filtration to obtain the leachate and leach residue;

[0055] After testing: the arsenic leaching rate is 51.29%, and the concentration of each element in the leach solution is Pb 515.20ppm, Se31.56ppm, Sb0.88g / L, Te 122.26ppm, As 9.36g / L.

[0056] (2) Selective reduction and purification of the leach solution: under the co...

Embodiment 3

[0063] Taking arsenic-containing soot from a lead-zinc smelter in China as an example, the main components of the raw material are Pb 5.46%, As 30.29%, Sn0.98%, Sb 29.58%, Zn 0.68%, Te 0.26%, Se 0.07%, and the following steps are used for processing :

[0064] (1) Oxygen pressure water immersion: Weigh a certain quality of high arsenic and antimony fume in the reaction kettle, the control conditions are liquid-solid volume mass ratio 10:1, stirring speed 300r / min, leaching temperature 200℃, oxygen partial pressure 2.5Mpa , the leaching time is 4h, after the leaching is completed and the oxidation blowing temperature is 650°C, the slurry is removed and separated by filtration to obtain the leachate and leach residue;

[0065] After testing: the arsenic leaching rate is 64.52%, and the concentration of each element in the leach solution is Pb 956.35ppm, Se18.91ppm, Sb0.93g / L, Te 144.92ppm, As 19.54g / L.

[0066] (2) Selective reduction and purification of the leach solution: at ...

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Abstract

The invention belongs to the technical field of metallurgy, and particularly relates to a method for arsenic containing material comprehensive recovering and arsenic resource utilization. The method sequentially comprises the four steps including oxygen pressure water leaching, leaching liquid selective reduction purification, leaching slag washing and slag washing for valuable metal recovering. Through the processes that oxygen pressure water leaching, soluble arsenic in smoke is desorbed, leaching liquid is subject to selective reduction purification, purified liquid is a pure sodium arsenite solution, and the leaching slag is subject to washing, reduction smelting, oxidation blowing and the like, all valuable elements are recycled to the greatest extent. According to the method, the arsenic is desorbed from the smoke, the stable arsenic fixing ore is synthesized, stibium, lead, bismuth and the like are left in arsenic removal slag as many as possible, and separation and harmless treatment of the arsenic and the valuable metal are achieved. The method is high in resource comprehensive utilization rate and wide in raw material application scope, and the problem of pollution in the traditional handicraft extraction process is solved. The beneficial effects of the method are more obvious for the smoke generated in the lead and zinc smelting process particularly.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for comprehensive recovery of arsenic-containing materials and resource utilization of arsenic. Background technique [0002] In nature, arsenic is usually known as arsenopyrite (FeAsS), arsenopyrhotite (FeAsS 2 ), Arsenite (FeAs 2 ), arsenite (Cu 3 AsS 3 ), realgar (As 2 S 3 ), orpiment (As 2 S 3 ) and other minerals, which are enriched in non-ferrous metal ores such as copper, lead, zinc, nickel, cobalt, gold and silver; in the process of non-ferrous metallurgy, many high-arsenic solid materials are produced, such as roasting and smelting smoke. These materials contain arsenic as high as 5-50%, and also contain a large amount of valuable metals, which are directly returned to the smelting process, resulting in the accumulation of arsenic in the system. Therefore, arsenic removal should usually be treated separately. Arsenic is a highly toxic and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/02C22B13/00C22B30/04C22B30/02
CPCC22B7/006C22B7/02C22B13/045C22B30/02C22B30/04Y02P10/20
Inventor 刘智勇刘志宏李启厚周亚明李玉虎张建鑫窦传龙
Owner CENT SOUTH UNIV
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