Method for resourcefully utilizing black copper mud by copper electrolysis

Abstract

The invention discloses a method for resourcefully utilizing black copper mud by copper electrolysis. The method comprises the steps: (1) primary pressure leaching of black copper mud; (2) secondary pressure leaching of black copper mud; (3) condensation crystallization; (4) alkali leaching and arsenic removal; (5) arsenic reduction. The method adopts primary pressure leaching, secondary pressure leaching, alkali leaching and arsenic removal of secondary leaching residues, condensation crystallization of primary leaching liquid, merging concentrated liquid with secondary leaching arsenic and alkali leaching liquid to reduce and move arsenic as a trunk process to process the black copper mud, therefore realizing effective separation of copper, arsenic, antimony and bismuth, and solving the problem of opening treatment of the black copper mud. Valuable elements such as copper, antimony, bismuth, nickel and arsenic in the black copper mud are effectively and comprehensively recovered, arsenic pollution governance realizes resourceful utilization, and the severe secondary pollution of hazardous solid wastes is avoided.

Description

technical field [0001] The invention belongs to the technical field of element recovery and utilization, and in particular relates to a method for resource utilization of copper electrolytic black copper slime. Background technique [0002] Black copper sludge is a by-product of the electrolyte purification process in the copper electrolytic refining process, which not only contains copper (50-55%), arsenic (20-30%) and other impurities, but also contains a small amount of antimony, bismuth and other elements. Listed as hazardous solid waste by the state. [0003] The existing electrolytic black copper slime treatment methods mainly include: return fire system smelting method, oxidation roasting leaching method, leaching electrolysis method, etc. Returning to the smelting of the fire system makes impurities such as arsenic, antimony, and bismuth circulate and enrich in the system, making it impossible to form an open circuit; arsenic is easy to enter the atmosphere during o...

AI Technical Summary

Problems solved by technology

Returning to the smelting of the fire system makes impurities such as arsenic, antimony, and bismuth circulate and enrich in the system, and cannot form an open circuit; arsenic is easy to enter the atmosphere during oxidation and roasting, which seriously pollutes the environment and endangers the health of operators; the leaching electrolysis method uses sulfide to fix arsenic The plan does not solve the problem of arsenic utilization

[0004] More importantly, in the current black copper slime treatment method, the valuable elements rich in black copper slime are not fully recovered, and the arsenic damage control has not realized resource utilization, resulting in high cost and serious secondary pollution

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