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A method for comprehensively recovering valuable metals from arsenic-containing smoke and synthesizing arsenic-fixing minerals by fractional crystallization

A valuable metal, fractional crystallization technology, applied in the field of metallurgy, can solve the problems of low comprehensive recovery rate of valuable elements, limited arsenic product market, untreated sodium arsenate, etc., achieve small BET specific surface area and improve the quality of recycled products , the effect of low arsenic content

Active Publication Date: 2019-01-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 smoke and synthesizing arsenic-fixing minerals by fractional crystallization

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 comprehensively recovering valuable metal from arsenic containing smoke and synthesizing arsenic fixing ore through a fractional crystallization method. The method includes the following steps of ordinary pressure water leaching, leaching agent catalytic oxidation, oxidized liquid arsenic fixing, leaching slag washing and slag washing for recovering the valuable metal. According to the method, through the processes that trivalent arsenic in a leaching agent is catalyzed and oxidized into pentavalent arsenic through ordinary pressure water leaching, oxidized liquid synthesizes the stable arsenic fixing ore through the fractional crystallization method, leaching slag washing is carried out, and leaching slag is subject to reduction smelting, oxidation blowing and the like, all valuable elements are recycled to the greatest extent. According to the method, the arsenic is desorbed from the smoke, stibium, lead, bismuth and the like are left in arsenic removal slag as many as possible, deep separation of the arsenic and other elements is achieved, the high-stability arsenic fixing ore is obtained, and recycling and harmless treatment of the arsenic containing smoke are achieved. The method is high in resource comprehensive utilization rate and wide in raw material application scope, and the problem of pollution in the traditional handicraft extraction process is solved. The beneficial effects of the method are more obvious for the smoke generated 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): C22B7/02C22B13/00C22B30/02C22B30/04C22B30/06
CPCC22B7/006C22B7/02C22B13/00C22B30/02C22B30/04C22B30/06Y02P10/20
Inventor 刘智勇刘志宏李启厚周亚明李玉虎张建鑫李思唯
Owner CENT SOUTH UNIV
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