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A method for removing arsenic from arsenic-containing smoke and its solidification

An arsenic fume and arsenic removal technology, 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 achieve a wide range of raw materials, low arsenic content, and comprehensive resources. The effect of high utilization

Active Publication Date: 2018-10-02
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 removing arsenic from arsenic-containing smoke and its solidification

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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 5.26%, As 39.65%, Sn 0.5%, Sb 29.36%, Zn 0.12%, Se 0.04%.

[0043] Proceed as follows:

[0044] 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 mass ratio of 10:1, the stirring speed of 700r / min, the NaOH concentration of 1mol / L, the leaching temperature of 80°C, and the leaching time of 2h. After the leaching, the slurry was removed and separated by filtration. The arsenic leaching rate was 72.36%. The concentration of each element in the leach solution was Pb 86.00ppm, Se 1.80ppm, Zn 20ppm, Sb 1.36g / L, As 28.69g / L;

[0045] The leaching solution adopts the method of catalytic oxidation to decompose 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...

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 10.39%, As 34.59%, Sn 1.45%, Sb 20.54%, Zn 0.11%, and Se 0.24%.

[0051] Proceed as follows:

[0052] Weigh a certain amount of high arsenic and antimony fumes into the reactor, and carry out the leaching experiment according to the liquid-solid volume mass ratio of 10:1, stirring speed of 700r / min, NaOH concentration of 3mol / L, leaching temperature of 50°C, and leaching time of 4h. After leaching, remove the slurry and filter and separate, the arsenic leaching rate is 52.06%. The concentration of each element in the leach solution is Pb 87ppm, Se 0.52ppm, Zn 71ppm, Sb1.24g / L, As 18.01g / L;

[0053] The leaching solution adopts the method of catalytic oxidation to decompose 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 ca...

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 19.57%, As 24.26%, Sn 1.47%, Sb 30.45%, Zn 0.16%, and Se 0.21%.

[0059] Proceed as follows:

[0060]Weigh a certain amount of high arsenic and antimony dust into the reactor, and carry out the leaching experiment according to the liquid-solid volume mass ratio of 5:1, stirring speed of 1000r / min, NaOH concentration of 1mol / L, leaching temperature of 30°C, and leaching time of 2h. After leaching, remove the slurry and filter and separate, the arsenic leaching rate is 42.26%. The concentration of each element in the leach solution is Pb 124ppm, Se 0.67ppm, Zn 107ppm, Sb2.02g / L, As 10.25g / L;

[0061] The leaching solution adopts the method of catalytic oxidation to decompose 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 cat...

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Abstract

The invention relates to a method for removing arsenic from smoke containing arsenic and curing arsenic. The method comprises production of comprehensively recycling valuable metals such as arsenic, antimony, lead and bismuth from the smelting smoke containing arsenic, antimony and lead, accumulation of arsenic in the system is reduced, and arsenic is made to be harmless. According to the method, through normal-pressure alkaline leaching, soluble arsenic is removed from the smoke, trivalent arsenic in a leaching agent is converted into pentavalent arsenic through catalytic oxidation, stable arsenic fixing minerals are synthesized through a growth control method, then the arsenic fixing minerals are cured through a stockpiling manner, the processes of washing, reduction smelting, oxidation blowing and the like are conducted on leaching residues, and valuable elements are recycled to the maximum extent. By the adoption of the method, arsenic is removed from the smoke, antimony, lead and bismuth are remained in the residues without arsenic as much as possible, and separation of arsenic and the valuable metals can be achieved and is harmless. By the adoption of the method, the comprehensive rate of resources is high, the raw material application range is wide, the pollution problem existing in a traditional process extraction process, especially the pollution caused by smoke generated in a lead-zinc smelting process is solved, and the advantages of the method are more remarkable.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for removing arsenic from arsenic-containing fume and solidifying it. 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 carcinogenic element, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/02C22B30/04C22B30/02C22B13/00C22B13/02
CPCC22B7/008C22B7/02C22B13/025C22B13/045C22B30/02C22B30/04Y02P10/20
Inventor 刘智勇刘志宏周亚明李启厚李玉虎姚伟朱银李思唯
Owner CENT SOUTH UNIV
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