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A resource comprehensive utilization method for purifying cobalt and nickel slag with zinc arsenic salt in hydrometallurgy

A technology for hydrometallurgical smelting of zinc and cobalt-nickel slag, applied in the direction of improving process efficiency, can solve problems such as wastewater discharge, achieve comprehensive recovery, eliminate the risk of arsenic metal pollutants, and reduce production costs.

Active Publication Date: 2021-11-19
湖南株冶有色金属有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These three methods are similar, all have the problem of wastewater discharge, and the toxic gas arsine will be produced in the selective zinc leaching step

Method used

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  • A resource comprehensive utilization method for purifying cobalt and nickel slag with zinc arsenic salt in hydrometallurgy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A. High-pressure alkaline leaching of arsenic: the mass percentage concentration is: Zn12.37%, Cu55.45%, Co3.41%, As13.28%, Pb3.24%, Ag0.017% cobalt-nickel slag, in alkali The leaching is carried out under the condition of a concentration of 5.2mol / L, the leaching temperature is 125°C, the liquid-solid ratio is 4:1, pure oxygen with an oxygen partial pressure of 2.6MPa is introduced, the leaching time is 3h, and the alkali leaching solution and alkali leaching solution are obtained by filtration scum.

[0034] B. Arsenic reduction: Cool and crystallize the alkali immersion solution obtained in step A to obtain sodium arsenate, dissolve the sodium arsenate crystals with water to obtain a sodium arsenate solution, adjust the pH of the sodium arsenate solution to 2, and then press SO 2 The molar ratio of arsenic to sodium arsenate solution is 2.05:1 and SO is passed through 2 , carry out the reduction reaction, the reduction time is 3.0h, and obtain the sodium arsenite so...

Embodiment 2

[0041] A. High-pressure alkaline arsenic immersion: the mass percent concentration is: Zn 12.37%, Cu 55.45%, Co 3.41%, As13.28%, Pb 3.24%, Ag 0.017% cobalt-nickel slag, at an alkali concentration of 3.8mol / L, the leaching temperature is 130°C, the liquid-solid ratio is 4:1, the oxygen partial pressure is 3.0MPa pure oxygen, the leaching time is 5h, and the alkali leaching solution and alkali leaching residue are obtained by filtration.

[0042] B. Arsenic reduction: Cool and crystallize the alkali immersion solution obtained in step A to obtain sodium arsenate, dissolve the sodium arsenate crystals with water and adjust the pH to 4, then press SO 2 The molar ratio to the arsenic in the sodium arsenate solution is 2.15:1 and the SO 2 , carry out the reduction reaction, the reduction time is 1.5h, and the sodium arsenite solution is obtained, and the saturated diarsenic trioxide crystals precipitated during the reduction process are dissolved with sodium hydroxide solution into...

Embodiment 3

[0049] A. High-pressure alkaline arsenic immersion: the mass percentage concentration is: Zn 12.37%, Cu 55.45%, Co 3.41%, As13.28%, Pb 3.24%, Ag 0.017% cobalt-nickel slag, at an alkali concentration of 4.8mol / L, the leaching temperature is 128°C, the liquid-solid ratio is 5:1, pure oxygen with an oxygen partial pressure of 2.8MPa is introduced, the leaching time is 4h, and the alkali leaching solution and alkali leaching residue are obtained by filtration.

[0050] B. Arsenic reduction: Cool and crystallize the alkaline immersion solution obtained in step A to obtain sodium arsenate, dissolve the sodium arsenate crystals with water and adjust the pH to 3, and then introduce SO 2 Reduction to obtain sodium arsenite solution. Among them, the reduction time is 2.0h, SO 2 Dosage is SO 2 The molar ratio to arsenic is 2.10: 1, the arsenic trioxide crystal saturated and precipitated in the reduction process is dissolved with sodium hydroxide solution into a sodium arsenite solutio...

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Abstract

The invention discloses a resource comprehensive utilization method for purifying cobalt-nickel slag by wet-method zinc-arsenic salt purification. Alkaline leaching is performed on the cobalt-nickel slag purified by wet-method zinc-arsenic salt, and alkali leaching solution and alkali leaching residue are obtained by filtration; The immersion solution is cooled and crystallized to obtain sodium arsenate. Dissolve the sodium arsenate with water and adjust the pH to 2-4, and then introduce SO 2 Reduction to obtain sodium arsenite solution; the alkali leaching residue is subjected to two-stage leaching, the first stage is low-acid leaching, and the second stage is high-acid leaching; copper powder is added to the low-acid leaching solution, copper powder is used to remove arsenic, and filtered to obtain The arsenic removal solution and the arsenic removal slag; the arsenic removal solution is subjected to controlled potential copper precipitation, and the copper precipitation solution and copper powder are obtained by filtering; the copper removal solution is added with sodium hypochlorite to oxidize and deposit cobalt. The recovery of the cobalt-nickel slag in the invention has the advantages of reasonable process, low separation cost, environmental protection and the like.

Description

technical field [0001] The invention relates to the field of resource utilization of cobalt-nickel slag purified by zinc arsenic salts in wet smelting, in particular to a method for comprehensive resource utilization of cobalt-nickel slag purified by zinc arsenic salts in wet smelting. Background technique [0002] In the process of hydrometallurgy at home and abroad, the use of zinc powder + arsenic trioxide purification (referred to as arsenic salt purification) to remove cobalt has low zinc powder consumption, good purification effect, and high enrichment of valuable metals in copper slag and cobalt nickel slag. . The purification of zinc sulfate solution in a domestic zinc smelting plant uses arsenic salt purification to remove cobalt, with an annual output of 1500-1800 tons of cobalt-nickel slag, which contains valence metals Cu42-53%, Co1.5-5.0%, Zn8-13%, and at the same time Contains As8-15%. [0003] Cobalt-nickel slag contains high content of valuable elements cop...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B30/04C22B15/00C22B19/30C22B19/20C22B23/00C22B13/00C22B11/00
CPCC22B7/007C22B7/008C22B11/042C22B13/045C22B15/0071C22B15/0089C22B19/22C22B19/30C22B23/043C22B23/0461C22B30/04Y02P10/20
Inventor 廖贻鹏林文军王勇周玉琳刘敏唐亦秋范洪生
Owner 湖南株冶有色金属有限公司
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