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A method for comprehensively recovering valuable metals from arsenic-containing dust and synthesizing arsenic-fixed minerals by regulating growth

A valuable metal, arsenic fume technology, applied in the metallurgical field, can solve the problems of low comprehensive recovery rate of valuable elements, limited arsenic product market, untreated sodium arsenate, etc., to maximize resource utilization and maximize harmlessness , the effect of improving the quality of recycled products

Active Publication Date: 2018-09-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

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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  • A method for comprehensively recovering valuable metals from arsenic-containing dust and synthesizing arsenic-fixed minerals by regulating growth

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Taking arsenic-containing soot from a lead-zinc smelter in China as an example, the main components of the raw materials are Pb 10.13%, As 30.11%, Sn 0.5%, Sb 30.02%, Zn 0.07%, Se 0.08%.

[0042] Proceed as follows:

[0043] (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 10:1, the stirring speed of 700r / min, the leaching temperature of 80°C, and the leaching time of 2h. After the leaching is completed, remove the slurry and filter and separate it. The arsenic leaching rate is 51.25%. The concentration of each element in the leach solution is Pb 75.00ppm, Se 0.52ppm, Zn 48ppm, Sb 0.66g / L, As15.43g / L;

[0044] (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 5L / min, the As / Mn molar ratio is controlled at 10:1, and the temperature of th...

Embodiment 2

[0049] Taking arsenic-containing soot from a lead-zinc smelter in China as an example, the main components of the raw materials are Pb 8.64%, As 25.63%, Sn 0.58%, Sb 24.56%, Zn 0.09%, Se 0.10%.

[0050] Proceed as follows:

[0051] (1) Weigh a certain amount of high-arsenic-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 300r / min, the leaching temperature of 60°C, and the leaching time of 2h. After leaching, remove the slurry and filter and separate, the arsenic leaching rate is 46.25%. The concentration of each element in the leach solution is Pb 69ppm, Se 0.73ppm, Zn 50ppm, Sb 0.67g / L, As11.85g / L;

[0052] (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 catalytic oxidati...

Embodiment 3

[0057] Taking arsenic-containing soot from a lead-zinc smelter in China as an example, the main components of the raw materials are Pb 13.24%, As 29.31%, Sn 0.9%, Sb 27.68%, Zn 0.04%, Se 0.11%.

[0058] Proceed as follows:

[0059] (1) Weigh a certain amount of high-arsenic-antimony fumes into the reactor, and carry out the leaching experiment according to the liquid-solid volume-to-mass ratio of 15:1, stirring speed of 50r / min, leaching temperature of 40°C, and leaching time of 3h. After leaching, remove the slurry and filter and separate, the arsenic leaching rate is 42.35%. The concentration of each element in the leach solution is Pb 113ppm, Se 0.50ppm, Zn 92ppm, Sb 1.37g / L, As12.41g / L;

[0060] (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 temperature of the catalytic oxidation system is contr...

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Abstract

The invention relates to a method for comprehensive recovery of valuable metals from arsenic-containing dust and synthesis of arsenic-fixing minerals with an adjusted and controlled growth method. The method comprises the steps as follows: normal pressure water leaching, catalytic oxidation of a leaching solution, arsenic fixing of an oxidized solution with the adjusted and controlled growth method, washing of leaching residues and recovery of the valuable metals from washing residues. With the method, various valuable elements are recycled through procedures of normal pressure water leaching, catalytic oxidation of the leaching solution, arsenic fixing of the oxidized solution with the adjusted and controlled growth method, washing of the leaching residues, reduction smelting of the washing residues, oxidizing blowing and the like. With the method, the arsenic is removed from the dust, antimony, lead, bismuth and the like are left in the arsenic-removed residues as much as possible, depth separation of arsenic and antimony is realized, the high-stability arsenic-fixing minerals are obtained, meet national standards and can be piled safely, and recycling and harmless treatment of the arsenic-containing dust 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 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 Patents(China)
IPC IPC(8): C22B7/02C22B13/02C22B13/00C22B30/02C22B30/04C22B30/06A62D3/33A62D101/43
CPCA62D3/33A62D2101/43C22B7/001C22B7/006C22B7/02C22B13/025C22B13/045C22B30/02C22B30/04C22B30/06Y02P10/20
Inventor 刘智勇刘志宏周亚明李启厚李玉虎张建鑫柯平超
Owner CENT SOUTH UNIV
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