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Method for comprehensively treating arsenic-contained smoke and synthesizing arsenic fixing minerals by control 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: 2017-06-13
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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  • Method for comprehensively treating arsenic-contained smoke and synthesizing arsenic fixing minerals by control growth method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 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 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 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, remove the slurry and filter and separate to obtain the leaching solution and leaching residue;

[0044] 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.

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

Embodiment 2

[0052] 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 process:

[0053] (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 leachate and leach residue;

[0054] 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.

[0055] (2) Solid arsenic in the leach solution: adjust the pH value of the leach solution obtained in the adjustment step (1) to 2.5, then r...

Embodiment 3

[0062] 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 process:

[0063] (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 finished, remove the slurry, filter and separate, and obtain the leaching solution and leaching residue;

[0064] 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.

[0065] (2) Solid arsenic in the leaching solution: adjust the pH value of the leaching solution obtained in the adjustment step (1...

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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 in particular relates to a method for comprehensively treating arsenic-containing smoke dust and synthesizing arsenic-fixed minerals by a growth-controlling method. 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 shoul...

Claims

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Application Information

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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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