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A method for comprehensive treatment of arsenic-containing smoke and dust and the method of synthesizing arsenic-fixed minerals by regulating the growth method

A comprehensive treatment, arsenic fume technology, applied in the field of metallurgy, can solve the problems of high arsenic content in leached slag, low purity, and unrecovered valuable metals, so as to improve the quality of recovered products, high comprehensive utilization of resources, and adaptability of raw materials wide effect

Active Publication Date: 2019-01-08
CENT SOUTH UNIV
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  • Claims
  • Application Information

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Problems solved by technology

However, if the soot contains metals (such as antimony) that are close to the properties of arsenic, the purity of the obtained arsenic trioxide is not high.
There are three main processes in wet production: water leaching, acid leaching, and alkali leaching, but they can only obtain products such as arsenic trioxide and sodium arsenate with low purity, and no further research has been done on the recovery of valuable metal powder
Chinese patent CN105567983A discloses a water leaching-alkali leaching treatment process for copper smelting dust, which separates arsenic from metals, but the separation of arsenic from other elements is not complete, and the arsenic content in the leaching residue is still high
Chinese patent CN104357668A discloses a method for leaching smoke and dust with dirty acid, electrodeposition to remove arsenic, acid leaching and electrodeposition process is easy to produce arsine
Chinese patents CN105648226A and CN105648227A disclose a method for separating arsenic and antimony by oxygen pressure alkali leaching. The separation of arsenic and antimony is relatively thorough, but there is no market for sodium arsenate obtained in the process, and valuable metals such as tellurium and antimony have not been recovered.
[0004] 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 treatment of arsenic-containing smoke and dust and the method of synthesizing arsenic-fixed minerals by regulating the growth method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Take arsenic-containing soot from a domestic lead-zinc smelter as an example. The main components of the raw materials are Pb 1.57%, As 48.56%, Sn 0.51%, Sb 21.24%, Zn 0.73%, Te 0.35%, Se 0.25%, and the following steps are used To process:

[0043] (1) Oxygen pressure water immersion: Weigh a certain quality of high arsenic and antimony fumes into the reactor. The control conditions are 10:1 liquid-solid mass ratio, stirring speed 300r / min, leaching temperature 160℃, oxygen partial pressure 2Mpa, The leaching time is 2h. After the leaching is completed, the slurry is removed and filtered to obtain the leaching liquid and the leaching residue;

[0044] After testing: the leaching rate of arsenic is 61.53%, the concentration of each element in the leaching solution is Pb 709.60ppm, Se31.02ppm, Sb1.26g / L, Te 123.28ppm, As 29.88g / L.

[0045] (2) Solid arsenic in the leaching solution: adjust the pH value of the leaching solution obtained in step (1) to 2 and then raise the temper...

Embodiment 2

[0052] Take arsenic-containing soot from a domestic lead-zinc smelter as an example. The main raw materials are Pb 6.88%, As 36.51%, Sn 1.11%, Sb 29.77%, Zn 0.54%, Te 0.24%, and Se 0.05%. Use the following steps to process:

[0053] (1) Oxygen pressure water immersion: Weigh a certain quality of high arsenic and antimony fumes into the reactor. The control conditions are 20:1 liquid-to-solid mass ratio, stirring speed 300r / min, leaching temperature 160℃, oxygen partial pressure 0.5Mpa , The leaching time is 2h, after the leaching is finished, the slurry is removed and separated by filtration to obtain the leaching liquid and the leaching residue;

[0054] After testing: the leaching rate of arsenic is 51.29%, the concentration of each element in the leaching solution is Pb 515.20ppm, Se 31.56ppm, Sb0.88g / L, Te 122.26ppm, As 9.36g / L.

[0055] (2) Solid arsenic in the leaching solution: adjust the pH of the leaching solution obtained in step (1) to 2.5 and then increase the temperatur...

Embodiment 3

[0062] Taking arsenic-containing soot from a domestic lead-zinc smelter as an example, the main raw materials are Pb 5.46%, As 30.29%, Sn 0.98%, Sb 29.58%, Zn 0.68%, Te 0.26%, and Se 0.07%. Use the following steps to process:

[0063] (1) Oxygen pressure water immersion: Weigh a certain quality of high arsenic and antimony fumes into the reactor. The control conditions are 10:1 liquid to solid mass ratio, stirring speed 300r / min, leaching temperature 200℃, oxygen partial pressure 2.5Mpa , The leaching time is 4h, after the leaching is finished, the slurry is removed and separated by filtration to obtain the leaching liquid and the leaching residue;

[0064] After testing: the leaching rate of arsenic is 64.52%, the concentration of each element in the leaching solution is Pb 956.35ppm, Se 18.91ppm, Sb 0.93g / L, Te 144.92ppm, As 19.54g / L.

[0065] (2) Solid arsenic in the leaching solution: adjust the pH value of the leaching solution obtained in step (1) to 2 and then increase the te...

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Abstract

The invention belongs to the technical field of metallurgy, and in particular, relates to a method for comprehensively treating arsenic-contained smoke and synthesizing arsenic fixing minerals by a control growth method. The method comprises four steps of oxygen pressure water leaching, leaching liquid arsenic fixation, leaching slag washing and recovery of valuable metal from washing slag in sequence; the method uses the oxygen pressure water leaching for removing solvable arsenic in the smoke; arsenic in leaching liquid is synthesized as high-stability arsenic fixing minerals by the control growth method; and then, the arsenic fixing minerals are cured by a stockpiling mode. All valuable elements are recycled from leaching slag to the greatest extent by such procedures as washing, reduction smelting and oxidation blowing. The method removes arsenic from the smoke and synthesizes the stable arsenic fixing minerals, but retains antimony, lead, bismuth and the like in the leaching slag as far as possible, and realizes separation of arsenic from the valuable metal and harmlessness. The method is high in resource comprehensive utilization rate and wide in raw material application range, solves the pollution problem in the traditional extracting process, in particular the smoke generated in the lead-zinc smelting process, and is more obvious in advantages.

Description

Technical field [0001] The invention belongs to the technical field of metallurgy, and specifically relates to a method for comprehensively treating arsenic-containing smoke and dust and synthesizing arsenic-fixing minerals by a regulating growth method. Background technique [0002] In nature, arsenic is usually used as arsenopyrite (FeAsS), arsenic pyrrhotite (FeAsS) 2 ), Arsenite (FeAs 2 ), sulphur-arsenic copper (Cu 3 AsS 3 ), Realgar (As 2 S 3 ), orpiment (As 2 S 3 ) Exists in the form of minerals such as copper, lead, zinc, nickel, cobalt, gold and silver and other non-ferrous metal ores; in the process of non-ferrous metallurgy, many high-arsenic solid materials are produced, such as roasting and smelting fumes. These materials contain arsenic as high as 5-50%. At the same time, the materials also contain a large amount of valuable metals. If they are directly returned to the smelting process, it will cause the cyclic accumulation of arsenic in the system. Therefore, arsen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/02C22B13/00C22B13/06C22B30/02C22B30/04C22B3/46
CPCC22B3/46C22B7/006C22B7/02C22B13/045C22B13/06C22B30/02C22B30/04Y02P10/20
Inventor 刘智勇刘志宏李启厚周亚明李玉虎张建鑫刘文德柯平超
Owner CENT SOUTH UNIV
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