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Efficient arsenic removal method for copper smelting high-arsenic smoke ash

A copper smelting and soot technology, which is applied in the field of efficient arsenic removal from copper smelting soot, can solve the problems of low comprehensive recovery rate of valuable elements, limited market for arsenic products, untreated sodium arsenate, etc., to save repeated production costs, Improve the arsenic precipitation rate and arsenic enrichment rate, and reduce the consumption of chemicals

Active Publication Date: 2018-02-27
紫金铜业有限公司 +1
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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
[0005] 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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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Cu: 20.05%, As: 7.38%, Pb: 3.04%, Zn: 3.86% in the copper arsenic-containing fume treated in this embodiment The treatment process and effect are as follows:

[0026] (1) The arsenic-containing dust is subjected to a first-level atmospheric pressure alkaline leaching, the NaOH concentration is 50g / L, the liquid-solid ratio is 5:1, the temperature is 80°C, and the time is 2h. Cu: 22.78%, As: 2.93%, Pb: 3.46%, Zn: 4.39% in primary leaching slag.

[0027] (2) The primary leaching slag was subjected to two-stage atmospheric pressure alkaline leaching, the liquid-solid ratio was 7:1, the NaOH concentration was 70g / L, the temperature was 85°C, and the time was 1h. In the secondary leaching slag, Cu: 31.79%, As: 1.07%, Pb: 4.41%, Zn: 5.85%; the leaching rates of arsenic, copper, lead and zinc were 90.9%, 0.1%, 8.6% and 4.5%, respectively.

[0028] (3) The obtained primary leachate is causticized, n(Ca):n(As)=3:1, the causticizing time is 2 hours, and the reaction temperature ...

Embodiment 2

[0030] Cu: 20.05%, As: 7.38%, Pb: 3.04%, Zn: 3.86% in the copper arsenic-containing fume treated in this embodiment The treatment process and effect are as follows:

[0031] (1) The arsenic-containing dust is subjected to a first-level atmospheric pressure alkaline leaching, the NaOH concentration is 40g / L, the liquid-solid ratio is 8:1, the temperature is 90°C, and the time is 1h. Cu: 22.28%, As: 3.25%, Pb: 3.21%, Zn: 4.10% in primary leaching slag.

[0032] (2) The primary leaching slag was subjected to secondary atmospheric pressure alkaline leaching, the liquid-solid ratio was 5:1, the NaOH concentration was 80g / L, the temperature was 60°C, and the time was 2h. In the secondary leaching slag, Cu: 31.53%, As: 1.11%, Pb: 4.35%, Zn: 5.61%; the leaching rates of arsenic, copper, lead and zinc were 90.5%, 0.9%, 9.8% and 8.4%, respectively.

[0033] (3) The obtained primary leachate is causticized, n(Ca):n(As)=2:1, the causticizing time is 4 hours, and the reaction temperature ...

Embodiment 3

[0035] Cu: 20.05%, As: 7.38%, Pb: 3.04%, Zn: 3.86% in the copper arsenic-containing fume treated in this embodiment The treatment process and effect are as follows:

[0036] (1) The arsenic-containing dust is subjected to a first-level atmospheric pressure alkaline leaching, the NaOH concentration is 60g / L, the liquid-solid ratio is 3:1, the temperature is 50°C, and the time is 3h. Cu: 25.04%, As: 3.15%, Pb: 3.49%, Zn: 4.48% in primary leaching slag.

[0037](2) The primary leaching slag was subjected to two-stage atmospheric pressure alkaline leaching, the liquid-solid ratio was 10:1, the NaOH concentration was 60g / L, the temperature was 90°C, and the time was 0.5h. In the secondary leaching slag, Cu: 32.02%, As: 1.20%, Pb: 4.47%, Zn: 5.71%; the leaching rates of arsenic, copper, lead and zinc were 90.2%, 0.2%, 8.1% and 7.5%, respectively.

[0038] (3) The obtained primary leachate is causticized, n(Ca):n(As)=6:1, the causticizing time is 1 hour, and the reaction temperature...

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Abstract

The invention discloses an efficient arsenic removal method for copper smelting high-arsenic smoke ash. The method comprises the following steps that 1, first-stage normal-pressure alkaline leaching is conducted on arsenic-containing smoke dust under the leaching conditions that leaching is conducted by adopting secondary leachate and the NaOH concentration is controlled at 40 g / L-60 g / L, solid-liquid separation is conducted, and primary leachate and primary leaching residues are obtained; 2, second-stage normal-pressure alkaline leaching is conducted on the primary leaching residues obtainedin the step 1 under the leaching condition that the NaOH concentration ranges from 60 g / L to 80 g / L, solid-liquid separation is conducted, and secondary leachate and secondary leaching residues are obtained; and 3, lime causticization is conducted on the primary leachate obtained in the step 1, solid-liquid separation is conducted, and calcium arsenate and causticization liquid are obtained. The method is suitable for treating high-arsenic-containing smoke dust generated in the copper smelting process, can achieve arsenic removal of the arsenic-containing smoke dust and comprehensive recoveryand utilization of valuable elements, and has the advantages of being environmentally friendly, economical, capable of saving energy and high in resource utilization rate.

Description

technical field [0001] The invention belongs to the field of nonferrous metal smelting, and in particular relates to a method for efficiently removing arsenic from copper smelting soot. 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. The open-circuit cost of arsenic in the copper smelting proce...

Claims

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Application Information

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IPC IPC(8): C22B7/02C22B30/04
CPCC22B7/008C22B7/02C22B30/04Y02P10/20
Inventor 陈杭衷水平王俊娥张焕然吴星琳李涛吕旭龙
Owner 紫金铜业有限公司
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