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A method for removing arsenic from arsenic-containing dust and comprehensively recycling valuable elements

A technology for valuable elements 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. Wide range of effects with low arsenic content

Active Publication Date: 2018-09-28
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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  • A method for removing arsenic from arsenic-containing dust and comprehensively recycling valuable elements

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Taking arsenic-containing soot from a lead-zinc smelter in China as an example, it includes the following main components in terms of mass percentage: Pb 5.26%, As 39.65%, Sn 0.5%, Sb 29.36%, Zn 0.12%, Se 0.04%.

[0055] Weigh a certain mass of the high arsenic and antimony fumes in the reaction kettle, according to the liquid-solid volume mass ratio of 10:1 (ml:g), the stirring speed is 700r / min, the NaOH concentration is 1mol / L, the leaching temperature is 80°C, and the leaching time is 2h. conditions for leaching experiments. After leaching, the slurry was removed and separated by filtration; the arsenic leaching rate was measured to be 72.36%, and the concentrations of elements in the leach solution were Pb 86.00ppm, Se 1.80ppm, Zn 20ppm, Sb 1.36g / L, and As 28.69g / L.

[0056] 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 ra...

Embodiment 2

[0061] Taking arsenic-containing soot from a lead-zinc smelter in China as an example, it includes the following main components in terms of mass percentage: Pb 10.39%, As 34.59%, Sn 1.45%, Sb 20.54%, Zn 0.11%, Se 0.24%.

[0062] Weigh a certain mass of the high arsenic and antimony fumes in the reaction kettle, according to the liquid-solid volume mass ratio of 10:1 (ml:g), the stirring speed is 700r / min, the NaOH concentration is 3mol / L, the leaching temperature is 50°C, and the leaching time is 4h. conditions for leaching experiments. After leaching, the slurry was removed and separated by filtration; the arsenic leaching rate was measured to be 52.06%, and the concentration of elements in the leaching solution were Pb 87ppm, Se 0.52ppm, Zn 71ppm, Sb 1.24g / L, and As 18.01g / L.

[0063] 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 ...

Embodiment 3

[0068] Taking arsenic-containing soot from a lead-zinc smelter in China as an example, it includes the following main components in terms of mass percentage: Pb 19.57%, As 24.26%, Sn 1.47%, Sb 30.45%, Zn 0.16%, Se 0.21%.

[0069] Weigh a certain mass of the high arsenic and antimony fumes in the reaction kettle, according to the liquid-solid volume mass ratio 5:1 (ml:g), stirring speed 1000r / min, NaOH concentration 1mol / L, leaching temperature 30 ℃, leaching time 2h conditions for leaching experiments. After leaching, the slurry was removed and separated by filtration; the arsenic leaching rate was measured to be 42.26%, and the concentrations of elements in the leach solution were Pb 124ppm, Se 0.67ppm, Zn 107ppm, Sb 2.02g / L, and As 10.25g / L.

[0070] 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 ...

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Abstract

The invention relates to a method for arsenic removal of arsenic-containing dust and comprehensive recycling of valuable elements. According to the method, production of comprehensive recovery of valuable metals such as arsenic, antimony, lead, bismuth and the like from smelting dust containing the arsenic, the antimony and the lead is performed, accumulation of the arsenic in the system is reduced, and harmless treatment is performed on the arsenic. With the method, through normal pressure alkaline leaching, soluble arsenic in the dust is removed, after trivalent arsenic in a leaching solution becomes pentavalent arsenic through catalytic oxidation, stable arsenic-fixing minerals are synthesized with the method for arsenic precipitation with lime and the precipitation transforming method and are solidified through piling, leaching residues are subjected to procedures of washing, reduction smelting, oxidizing blowing and the like, and the various valuable elements are recycled to the maximum extent. With the method, the arsenic is removed from the dust, the antimony, the lead, the bismuth and the like are left in the arsenic-removed residues as much as possible, and separation and harmless treatment of the arsenic and the valuable metals can be 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 removing arsenic from arsenic-containing smoke and comprehensively recycling valuable elements. 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/02C22B13/00C22B30/04
CPCC22B7/008C22B7/02C22B13/045C22B30/04Y02P10/20
Inventor 刘智勇刘志宏李启厚姚伟李玉虎周亚明蒋涛李思唯
Owner CENT SOUTH UNIV
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