A method for arsenic-containing arsenic dust removal and distribution crystallization to synthesize arsenic-fixed minerals

A technology for distributing crystallization and arsenic fume, which is applied in the field of metallurgy, can solve the problems of no further research on the recovery of valuable metal powder, incomplete separation of arsenic and other elements, and low purity of arsenic trioxide, so as to achieve a wide range of raw materials and high stability , the effect of high crystallinity

Active Publication Date: 2018-12-11
CENT SOUTH UNIV
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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 arsenic-containing arsenic dust removal and distribution crystallization to synthesize arsenic-fixed minerals

Examples

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%, As 48.56%, Sn 0.51%, Sb 21.24%, Zn 0.73%, Te 0.35%, Se 0.25%. Take the following steps to 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, the slurry is removed, filtered and separated to obtain the arsenic-containing leach solution and leach 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, Se 31.02ppm, Sb 1.26g / L, Te 123.28ppm, As 29.88g / L.

[0046] (2) Fixing arsenic in the leach solution: the leach solution obtained in step (1) is synthesized with ...

Embodiment 2

[0053] Taking arsenic-containing soot from a lead-zinc smelter in China as an example, the main components of the raw materials are Pb 6.88%, As 36.51%, Sn 1.11%, Sb 29.77%, Zn 0.54%, Te 0.24%, Se 0.05%. Take the following steps to 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 finished, remove the slurry and filter and separate to obtain the arsenic-containing leach solution and leach residue;

[0055] After testing: the arsenic leaching rate is 51.29%, and the concentration of each element in the leach solution is 515.20ppm Pb, 31.56ppm Se, 0.88g / L Sb, 122.26ppm Te, and 9.36g / L As.

[0056] (2) Arsenic fixation in the leach solution: the leach solution obtained in step (1) is synthesized by the ...

Embodiment 3

[0063] Taking arsenic-containing soot from a lead-zinc smelter in China as an example, the main components of the raw materials are Pb 5.46%, As 30.29%, Sn 0.98%, Sb 29.58%, Zn 0.68%, Te 0.26%, Se 0.07%. Take the following steps to deal with:

[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 over, remove the slurry and filter and separate to obtain the arsenic-containing leach solution 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, Se 18.91ppm, Sb 0.93g / L, Te 144.92ppm, As 19.54g / L.

[0066] (2) Fixing arsenic in the leach solution: the leach solution obtained in step (1) adopts the distributed crys...

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Abstract

The invention belongs to the technical field of metallurgy and particularly relates to a method for arsenic removal of arsenic-containing dust and synthesis of arsenic-fixing minerals with a fractional crystallization method. The method sequentially comprises four steps including oxygen pressure water leaching, arsenic fixing with a leaching solution, washing of leaching residues and recovery of valuable metals from washing residues. According to the method, through oxygen pressure water leaching, soluble arsenic in the dust is removed, the stable arsenic-fixing minerals are synthesized from the leaching solution with the fractional crystallization method, and then the arsenic-fixing minerals are solidified through stockpiling. The leaching residues are subjected to procedures of washing, reduction smelting, oxidizing blowing and the like, and various valuable elements are recycled to the maximum extent. With the method, the arsenic is removed from the dust, the stable arsenic-fixing minerals are synthesized, antimony, lead, bismuth and the like are left in the leaching residues as much as possible, and separation and harmless treatment of the arsenic and the valuable metals are realized. According to the method, the comprehensive utilization rate of resources is high, the raw material application range is wide, the problem of pollution in the extraction process of the traditional technology is solved, and the method has the more obvious advantages for the dust produced 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 arsenic removal from arsenic-containing smoke and a distributed crystallization method for synthesizing arsenic-fixed minerals. 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 mineral forms, 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%. 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 lead to the accumulation of arsenic in the system. Therefore, arsenic removal shou...

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
Owner CENT SOUTH UNIV
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