Safe treatment method for recycling valuable metals and arsenic from arsenic-containing smoke

A technology for valuable metals and arsenic soot, applied in the field of metallurgy, can solve the problems of low comprehensive recovery rate of valuable elements, limited market for arsenic products, untreated sodium arsenate, etc. The effect of high comprehensive utilization

Active Publication Date: 2017-06-13
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 a 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] There are many research papers and related patent reports on removing arsenic from soot and extracting valuable metals, but the comprehensive recovery rate of valuable elements is low, the market for arsenic products is limited, and there are potential safety hazards

Method used

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  • Safe treatment method for recycling valuable metals and arsenic from arsenic-containing smoke

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%, As 48.56%, Sn 0.51%, Sb 21.24%, Zn 0.73%, Te 0.35%, Se 0.25%.

[0043] Proceed as follows:

[0044] (1) Weigh a certain amount of high arsenic and antimony fumes in the reaction kettle, and carry out the leaching experiment according to the liquid-solid volume-to-mass ratio of 5:1, the stirring speed of 100r / min, the leaching temperature of 70°C, and the leaching time of 4h. After leaching, the slurry was removed and separated by filtration. The arsenic leaching rate was 41.53%, and the element concentrations in the leachate were Pb 709.60ppm, Se 31.02ppm, Sb 1.26g / L, Te123.28ppm, As 20.17g / L.

[0045] (2) The leaching liquid adopts the method of catalytic oxidation to convert As 3+ Oxidized to As 5+ , the control conditions are that the oxygen flow rate is 5L / min, the As / Mn molar ratio is controlled at 10:1, and the temperature of the...

Embodiment 2

[0050] 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%.

[0051] Proceed as follows:

[0052] (1) Weigh a certain amount of high-arsenic and antimony fumes in the reactor, and carry out the leaching experiment according to the liquid-solid volume-to-mass ratio of 20:1, stirring speed of 300r / min, leaching temperature of 40°C, and leaching time of 2h. After leaching, the slurry was removed and separated by filtration. The arsenic leaching rate was 41.29%, and the concentrations of elements in the leach solution were Pb 515.20ppm, Se 31.56ppm, Sb 0.88g / L, Te122.26ppm, As 15.07g / L.

[0053] (2) The leaching liquid adopts the method of catalytic oxidation to convert As 3+ Oxidized to As 5+ , the control conditions are as follows: the oxygen flow rate is 10L / min, the As / Mn molar ratio is controlled at 40:1, and the temperature of the ...

Embodiment 3

[0058] 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%.

[0059] Proceed as follows:

[0060] (1) Weigh a certain amount of high-arsenic and antimony fumes into the reaction kettle, and carry out the leaching experiment according to the liquid-solid volume-to-mass ratio of 15:1, the stirring speed of 50r / min, the leaching temperature of 90°C, and the leaching time of 3h. After leaching, the slurry was removed and separated by filtration. The arsenic leaching rate was 44.52%, and the element concentrations in the leach solution were Pb 956.35ppm, Se 18.91ppm, Sb 0.93g / L, Te144.92ppm, As 13.48g / L.

[0061] (2) The leaching liquid adopts the method of catalytic oxidation to convert As 3+ Oxidized to As 5+ , the control conditions are as follows: the oxygen flow rate is 1L / min, the As / Mn molar ratio is controlled at 20:1, and the tem...

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Abstract

The invention relates to a safe treatment method for recycling valuable metals and arsenic from arsenic-containing smoke. The safe treatment method comprises the following steps: carrying out water leaching under normal pressure; carrying out catalytic oxidation on leachate; after oxidization, solidifying arsenic in the leachate; washing leaching residues; and recycling valuable metals from the washed residues. According to the method, soluble arsenic is removed from the smoke through normal-pressure water leaching; trivalent arsenic is oxidized into pentavalent arsenic after a catalytic oxidation procedure is carried out on the leachate; after oxidation, high-stability solid arsenic minerals are obtained by synthesizing the leachate by a lime arsenic precipitation process, and then, cementation treatment is carried out; and after the leaching residues are treated by the procedures of washing, reduction smelting and oxidization blowing, all valuable elements are recycled and utilized. The method has the advantages that the arsenic is removed from the smoke and solidified, the valuable elements, such as stibium, lead and bismuth, are kept in the leaching residues as much as possible, and the harmless separation of the arsenic from the valuable metals is realized. The comprehensive utilizing rate of the resources is high, the application range of the raw materials is wide, and a pollution problem in the extracting process of a traditional technology is solved. The method has more remarkable advantages over smoke produced in lead and zinc smelting processes.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for comprehensively recovering valuable metals from arsenic-containing fumes and harmless disposal 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 hi...

Claims

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Application Information

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Patent Type & Authority Applications(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邹元敏李思唯
Owner CENT SOUTH UNIV
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