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Method for recovering valuable metal from smoke containing arsenic and conducting arsenic harmless treatment

A technology for valuable metals and arsenic fume, which is 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., and maximize resource utilization and harmlessness , the effect of low arsenic content

Active Publication Date: 2017-05-31
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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  • Method for recovering valuable metal from smoke containing arsenic and conducting arsenic harmless treatment

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 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%.

[0047] Proceed as follows:

[0048] (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;

[0049] (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

[0054] 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%.

[0055] Proceed as follows:

[0056] (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, the arsenic leaching rate was 46.25%. The element concentrations in the leach solution were Pb 69ppm, Se 0.73ppm, Zn 50ppm, Sb 0.67g / L, As 11.85g / L;

[0057] (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 oxidation system is controlled at 30°C; the results s...

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 13.24%, As 29.31%, Sn 0.9%, Sb 27.68%, Zn 0.04%, Se 0.11%.

[0063] Proceed as follows:

[0064] (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;

[0065] (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 recovering valuable metal from smoke containing arsenic and conducting arsenic harmless treatment. The method comprises the following steps that normal-pressure water leaching is conducted; catalytic oxidation of a leaching solution is conducted; arsenic solidification of the oxidized solution is conducted; a leaching residue is washed; and the valuable metal in the washed residue is recovered. By the adoption of the method, soluble arsenic in the smoke is removed through normal-pressure water leaching, trivalent arsenic in the leaching solution is converted into pentavalent arsenic through catalytic oxidation, arsenic in the oxidized solution is converted into stable solid arsenic minerals through synthesis, then the solid arsenic minerals are solidified in a stockpiling or cement solidification mode, the leaching residue is processed through the working procedures of washing, reduction smelting and oxidation blowing, and therefore various valuable elements are recycled to the maximum extent. According to the method, arsenic is removed from the smoke, stibium, lead, bismuth and the like can be left in the residue without arsenic as far as possible, and therefore separation between arsenic and the valuable metal and harmless treatment are achieved. By means of the method, the resource comprehensive utilization ratio is high, the application range of raw materials is broad, the problems that pollution is caused in the conventional technological extraction process, and especially smoke is generated in the lead and zinc smelting process are solved, and the advantages of the method are more obvious.

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): C22B7/02C22B30/04C22B30/02C22B13/02
CPCC22B7/006C22B7/02C22B13/025C22B30/02C22B30/04Y02P10/20
Inventor 刘智勇刘志宏周亚明李启厚李玉虎姚伟黄辉李思唯
Owner CENT SOUTH UNIV
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