A method for comprehensive recovery of valuable metals from arsenic-containing fume and safe disposal of arsenic

A valuable metal and arsenic fume technology, applied in the field of metallurgy, can solve the problems of low recovery rate of valuable metals, limited market for arsenic products, untreated sodium arsenate, etc. Effects of low arsenic content

Active Publication Date: 2019-01-08
CENT SOUTH UNIV
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  • Summary
  • 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
[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 recovery of valuable metals from arsenic-containing fume and safe disposal of arsenic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 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:

[0045] (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, filter and separate, and separate to obtain the leaching liquid and leaching residue;

[0046] 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, As29.88g / L.

[0047] (2) Arsenic solidification in the leach solution: adjust the pH value of the leach solution obtained in st...

Embodiment 2

[0054] 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% for processing:

[0055] (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 over, remove the slurry and filter and separate, and separate to obtain the leaching liquid and leaching residue;

[0056] 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.

[0057] (2) Solid arsenic in the leach solution: adjust the pH value of the leach solution obtained in step (1) to 2, add CaO as the arsenic precipitatio...

Embodiment 3

[0064] 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%, As30.29%, Sn0.98%, Sb 29.58%, Zn 0.68%, Te 0.26%, Se 0.07% using the following steps deal with:

[0065] (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, remove the slurry and filter and separate, and separate to obtain the leachate and leach residue;

[0066] 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.

[0067] (2) Solid arsenic in the leaching solution: adjust the pH value of the leaching solution obtained in step (1) to 1.5, add C...

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Abstract

The invention relates to the technical field of metallurgy, in particular to a method for comprehensively recovering valuable metal from arsenic-contained smoke and safely treating arsenic. The method comprises five steps of oxygen pressure water leaching, leaching liquid arsenic fixation, cement curing, leaching slag washing and recovery of valuable metal from washing slag; the method uses the oxygen pressure water leaching for removing solvable arsenic in the smoke; leaching liquid is synthesized as stable arsenic fixing minerals by a lime arsenic sinking method; and then, the arsenic fixing minerals are cured by a cement curing 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 recovering valuable metals from arsenic-containing fumes and safely disposing 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 ca...

Claims

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Application Information

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