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A comprehensive treatment method for arsenic-containing materials

A comprehensive processing and material technology, applied in the field of metallurgy, to achieve the effect of high resource utilization, low arsenic content, and reduced arsenic content

Active Publication Date: 2018-12-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can realize arsenic removal from arsenic dust and comprehensive recycling of valuable elements

Method used

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  • A comprehensive treatment method for arsenic-containing materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] 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%.

[0054] 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 the leaching, the slurry was removed and separated by filtration; the arsenic leaching rate was measured to be 72.36%. The concentration of each element in the leach solution: Pb 86.00ppm, Se 1.80ppm, Zn 20ppm, Sb 1.36g / L, As 28.69g / L.

[0055] The resulting leaching solution was catalyzed to oxidize As 3+ Oxidized to As 5+ , the control conditions are as follows: the oxygen flow rate is 5L / min, the molar ratio of As to Mn is controlled ...

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 the leaching, the slurry was removed and separated by filtration; the arsenic leaching rate was measured to be 52.06%. The element concentrations in the leach solution were Pb 87ppm, Se 0.52ppm, Zn 71ppm, Sb 1.24g / L, 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 molar ratio of As to M...

Embodiment 3

[0069] 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%.

[0070]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 the leaching, the slurry was removed and separated by filtration; the arsenic leaching rate was measured to be 42.26%. The concentration of each element in the leach solution was Pb 124ppm, Se0.67ppm, Zn 107ppm, Sb 2.02g / L, As 10.25g / L.

[0071] The resulting leaching solution was catalyzed to oxidize As 3+ Oxidized to As 5+ , the control conditions are as follows: the oxygen flow rate is 1L / min, the molar ratio of As to Mn is controlled at 20:1, and the temperature of th...

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Abstract

The invention relates to a comprehensive treatment method of arsenic-containing materials. 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, trivalent arsenic in a leaching solution becomes pentavalent arsenic through catalytic oxidation, stable arsenic-fixing minerals are synthesized with the fractional crystallization method and then are solidified through stockpiling, leaching residues are subjected to procedures of washing, reduction smelting, oxidizing blowing and the like, and 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 comprehensive treatment method for arsenic-containing materials. 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 its applicat...

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
CPCA62D3/33A62D2101/43C22B7/001C22B7/008C22B7/02C22B13/025C22B13/045C22B30/02C22B30/04C22B30/06Y02P10/20
Inventor 刘智勇刘志宏李启厚周亚明李玉虎姚伟张涛李思唯
Owner CENT SOUTH UNIV
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