Method for individually processing high-iron zinc sulfide concentrate

Abstract

The invention belongs to the technical field of hydrometallurgy, and particularly relates to a method for individually processing high-iron zinc sulfide concentrate. The method comprises a step of subjecting the high-iron zinc sulfide concentrate to calcination in a fluidized bed combustion boiler to obtain zinc calcine; a step of subjecting the zinc calcine to neutral leaching to produce neutral leaching solution and neutral leaching residue; a step of, after the neutral leaching residue and the high-iron zinc sulfide concentrate are mixed, successively performing reduction leaching and oxidation leaching, and circulating oxidation leaching solution to the reduction leaching to produce reduction leaching solution and silver-rich sulfur residue; a step of replacing the reduction leaching solution by using iron powder to precipitate copper and to produce copper-rich slag and solution after copper precipitation; a step of subjecting the solution after copper precipitation to pre-neutralization by using the zinc calcine, and then replacing by using zinc powder to precipitate indium and to produce indium-rich slag and solution after indium precipitation; and a step of bubbling oxygen into the solution after indium precipitation, heating and removing iron to obtain iron removal solution and hematite slag. The hematite slag can be utilized as a raw material for ironmaking. The method has strong pertinence, short technological process and high metal recovery yield, and the method is clean, efficient, energy-saving and environmental friendly. Separation and comprehensive utilization of zinc, indium, copper and iron are achieved.

Description

technical field

[0001] The invention belongs to the technical field of hydrometallurgy, in particular to a method for separately treating high-iron zinc sulfide concentrate. Background technique

[0002] During the ore-forming process of sphalerite, iron and indium replace zinc atoms in sphalerite with isomorphism, and it is difficult to separate zinc, iron, and indium by mechanical grinding and beneficiation methods, resulting in the zinc produced by beneficiation Concentrates with high iron content and low zinc content are associated with relatively high content of indium, copper and other metals, which are called high-iron-zinc concentrates. This kind of high-iron-zinc concentrate usually has low zinc grade, high indium and iron content, low associated lead content, and a considerable amount of associated copper and tin.

[0003] During the smelting process, due to the mosaic coexistence of iron and zinc in the high-iron-zinc concentrate, a large amount of zinc ferrite w...

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