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Method for efficiently cleaning and removing arsenic in copper-containing slag

A copper slag, high-efficiency technology, applied in the field of high-efficiency cleaning and arsenic removal, can solve the problems of complex process flow of iron salt method, easy introduction of other impurities, difficult solid-liquid separation, etc. Arsenic works well

Inactive Publication Date: 2017-08-29
KUNMING METALLURGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the currently available arsenic removal methods, the lime method has the disadvantage of high loss of copper and low leaching rate; the iron salt method has a complicated process and is easy to introduce other impurities; the sodium sulfide method has difficulty in solid-liquid separation after leaching, resulting in a large amount of difficult The problem of treated wastewater

Method used

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  • Method for efficiently cleaning and removing arsenic in copper-containing slag

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The copper-containing slag is crushed and finely ground to obtain copper-containing slag powder, and then according to the liquid-solid ratio of 5:1, a sodium hydroxide solution with a concentration of 30g / L is added to form a mixed material; the mixed material is added to the autoclave, and oxygen is introduced , under the conditions of controlling the oxygen pressure to 0.8MPa, the leaching temperature to 100°C, the leaching time to 1h, and the stirring speed to 200r / min, the pressurized oxidation alkaline leaching reaction was carried out. After the leaching reaction time is reached, the ore pulp after the pressurized oxidation alkali leaching is filtered to obtain the leach residue and leach solution containing lead and silver; the obtained leach residue is returned to the fire method to recover the lead, silver, antimony, etc. valence metals. Add sodium hydroxide solution to the obtained leaching solution to adjust the pH to 9, and obtain the filtrate and arsenic-f...

Embodiment 2

[0036] The copper-containing slag is crushed and finely ground to obtain copper-containing slag powder, and then according to the liquid-solid ratio of 5:1, a sodium hydroxide solution with a concentration of 25g / L is added to form a mixed material; the mixed material is added to the autoclave, and oxygen is introduced , under the conditions of controlling the oxygen pressure to 1.0MPa, the leaching temperature to 80°C, the leaching time to 1h, and the stirring speed to 400r / min, the pressurized oxidation alkaline leaching reaction was carried out. After the leaching reaction time is reached, the ore pulp after the pressurized oxidation alkali leaching is filtered to obtain the leach residue and leach solution containing lead and silver; the obtained leach residue is returned to the fire method to recover the lead, silver, antimony, etc. valence metals. Add sodium hydroxide solution to the obtained leachate to adjust the pH to 9, and obtain the filtrate and arsenic-fixed slag ...

Embodiment 3

[0038] The copper-containing slag is crushed and finely ground to obtain copper-containing slag powder, and then according to the liquid-solid ratio of 5:1, a sodium hydroxide solution with a concentration of 40g / L is added to form a mixed material; the mixed material is added to the autoclave, and oxygen is introduced , under the conditions of controlling the oxygen pressure to 1.0MPa, the leaching temperature to 100°C, the leaching time to 2h, and the stirring speed to 600r / min, the pressurized oxidation alkaline leaching reaction was carried out. After the leaching reaction time is reached, the ore pulp after the pressurized oxidation alkali leaching is filtered to obtain the leach residue and leach solution containing lead and silver; the obtained leach residue is returned to the fire method to recover the lead, silver, antimony, etc. valence metals. Add sodium hydroxide solution to the obtained leachate to adjust the pH to 9, and obtain the filtrate and arsenic-fixed slag...

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Abstract

The invention discloses a method for efficiently cleaning and removing arsenic in copper-containing slag. The method comprises steps of crushing, fine grinding, oxygen pressure alkaline leaching, pH regulation, oxygen pressure acid leaching and the like. The method sequentially comprises the following steps: efficiently cleaning and separating arsenic in the copper-containing slag as well as lead, silver and other valuable metals, and recovering copper in the copper-containing slag. The method disclosed by the invention is low in energy consumption, less in environmental pollution and high in production efficiency. The reaction process of the method is simple and rapid, and the selectivity is high. The copper in the copper-containing slag can be efficiently leached, and the metals can be completely separated. Compared with the conventional copper-containing slag treatment process technology, the arsenic is removed in a sodium arsenate precipitation form through alkaline leaching before copper leaching, so that high-efficiency cleaning and arsenic removal can be achieved, the arsenic removal effect is excellent, and the arsenic content in the leaching solution is less than 1g / L. Moreover, the copper is recovered through the oxygen pressure acid leaching, and the finally prepared copper sulfate product has the copper leaching rate of more than or equal to 96%. The arsenic in the copper-containing slag is recovered in an arsenic slag form, and secondary pollution of the arsenic is avoided. The technology has the advantages of high metal recovery rate, low production cost, high-efficiency cleaning and the like.

Description

technical field [0001] The invention belongs to the technical field of pressurized hydrometallurgy of nonferrous metals, and in particular relates to a method for efficiently cleaning and removing arsenic from copper-containing slag. Background technique [0002] The annual output of lead-zinc smelting copper-containing slag in my country reaches more than 50 million tons, and Yunnan Province has more than 10 million tons. These copper slags contain copper grades of 10%~40%, lead 3%~80%, and zinc 3%~20%. 1%~30% of bismuth and 0.9% of silver have great potential value and are a kind of mineral resources with high value of comprehensive utilization and recovery. Lead-zinc smelting copper-containing slag is the waste slag produced during the lead-zinc smelting process. This type of slag includes converter slag, sub-matte, copper scum, copper-cadmium slag, lead matte, anode slime, etc. In the lead-zinc smelting process, a large amount of copper scum is produced every year. These...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/00C22B13/00C22B30/02C22B15/00
CPCC22B7/007C22B7/008C22B11/044C22B13/045C22B15/0071C22B30/02Y02P10/20
Inventor 杨筱筱胥福顺包崇军朱国邦周娴王家仁张安福吴慧张永平李雨耕张志军匡志恩雷华志刁薇之周先超闫森周悦
Owner KUNMING METALLURGY INST
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