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A low-cost method for removing arsenic from copper smelting high-arsenic soot

A low-cost, copper smelting technology, applied in the improvement of process efficiency, instruments, optics, etc., can solve the problems of low comprehensive recovery rate of valuable elements, untreated sodium arsenate, high cost of dearsenic, and achieve high-efficiency selective leaching , the effect of reducing the cost of chemicals and improving the arsenic enrichment rate

Active Publication Date: 2019-06-28
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 there are low comprehensive recovery rates of valuable elements, high alkali consumption, and high cost of arsenic removal

Method used

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  • A low-cost method for removing arsenic from copper smelting high-arsenic soot
  • A low-cost method for removing arsenic from copper smelting high-arsenic soot
  • A low-cost method for removing arsenic from copper smelting high-arsenic soot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[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 immersed in water, the pH is 6, the liquid-solid ratio is 5, the temperature is 80° C., and the time is 2 hours. In the leaching residue, Cu: 12.76%, As: 7.30%, Pb: 3.45%, Zn: 2.41%; in the leaching solution, Cu: 16.3g / L, As: 1.8g / L, Zn: 3.2g / L.

[0037] (2) The medium leaching residue is subjected to the first-level atmospheric pressure alkaline leaching, the liquid-solid ratio is 5:1, the temperature is 80°C, and the time is 2h. Cu: 14.5%, As: 2.90%, Pb: 3.92%, Zn: 2.74% in primary leaching slag.

[0038] (3) The primary leaching slag was subjected to two-stage atmospheric pressure alkaline leaching, the liquid-solid ratio was 7:1, the NaOH concentration was 90g / L, the temperature was 85°C, and the time was 1h. In the secondary leaching slag, Cu: 20.14%, As: 1.05%, ...

Embodiment 2

[0042] Cu: 20.05%, As: 7.38%, Pb: 3.04%, Zn: 3.86% in the copper arsenic-containing fume treated in this example. The treatment process and effect are as follows:

[0043] (1) The arsenic-containing dust is immersed in water, the pH is 2, the liquid-solid ratio is 10, the temperature is 30° C., and the time is 3 hours. In the leaching residue, Cu: 10.67%, As: 6.95%, Pb: 3.58%, Zn: 2.27%; in the leaching solution, Cu: 18.9g / L, As: 2.2g / L, Zn: 3.6g / L.

[0044] (2) The leaching slag is subjected to the first-level atmospheric pressure alkaline leaching, the liquid-solid ratio is 8:1, the temperature is 90°C, and the time is 1h. Cu: 11.86%, As: 3.09%, Pb: 3.96%, Zn: 2.50% in primary leaching slag.

[0045] (3) The primary leaching slag was subjected to secondary atmospheric pressure alkaline leaching, the liquid-solid ratio was 5:1, the NaOH concentration was 150g / L, the temperature was 60°C, and the time was 2h. In the secondary leaching residue, Cu: 16.95%, As: 1.09%, Pb: 5.6...

Embodiment 3

[0049] Cu: 20.05%, As: 7.38%, Pb: 3.04%, Zn: 3.86% in the copper arsenic-containing fume treated in this example. The treatment process and effect are as follows:

[0050] (1) The arsenic-containing dust is immersed in water, the pH is 7, the liquid-solid ratio is 3, the temperature is 95°C, and the time is 1h. In the leaching residue, Cu: 13.38%, As: 7.36%, Pb: 3.38%, Zn: 2.57%; in the leaching solution, Cu: 15.5g / L, As: 1.6g / L, Zn: 3.0g / L.

[0051] (2) The leaching slag is subjected to the first-level atmospheric pressure alkaline leaching, the liquid-solid ratio is 3:1, the temperature is 50°C, and the time is 3h. Cu: 16.73%, As: 3.13%, Pb: 4.21%, Zn: 3.19% in primary leaching slag.

[0052] (3) The primary leaching slag was subjected to two-stage atmospheric pressure alkaline leaching, the liquid-solid ratio was 10:1, the NaOH concentration was 40g / L, the temperature was 90°C, and the time was 0.5h. In the secondary leaching residue, Cu: 21.44%, As: 1.21%, Pb: 5.38%, Zn...

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Abstract

The invention discloses a method for low-cost dearsenification of copper smelting high-arsenic fume. The method comprises the following steps: A, performing neutral leaching on arsenic-containing fume, and after leaching is completed performing solid-liquid separation so as to obtain neutral leachate and natural leachate slag; B, performing primary normal-pressure alkali leaching on the natural leachate slag obtained in the step A, and after leaching is completed, performing solid-liquid separation so as to obtain primary leachate and primary leachate slag, wherein the final alkali concentration of the leachate is controlled to be less than 50g / L; C, performing secondary normal pressure alkali leaching on the primary leachate slag obtained in the step B, and after leaching is completed, performing solid-liquid separation so as to obtain secondary leachate and secondary leachate slag, wherein the NaOH concentration is 40-150g / L; D, performing rotational flow electrodeposition process copper removal by using the leachate obtained in the step A, wherein products are standard cathode copper and a copper removal after liquid; and E, performing lime causticization on the primary leachateobtained in the step B, and performing solid-liquid separation, thereby obtaining calcium arsenate and a causticization after liquid. The method is capable of low-cost high-efficiency dearsenification of c arsenic-containing fume and solving the influence of continuous increase of arsenic in copper concentrate to the copper smelting process, and has the advantages of environment protection, economy, energy conservation and resource utilization rates.

Description

technical field [0001] The invention belongs to the field of nonferrous metal smelting, and in particular relates to a method for effectively 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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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/02C22B15/00C22B19/20C25C1/12C22B30/04
CPCC22B7/006C22B7/008C22B7/02C22B15/0065C22B19/20C22B30/04C25C1/12Y02P10/20
Inventor 衷水平陈杭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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