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Low-Grade Complex Chalcopyrite

     

A Method for Selective Separation of Copper, Zinc and Iron from Low-Grade Complex Chalcopyrite

Relating to the technical field of metallurgical engineering

low-grade polymetallic complex chalcopyrite is finely ground and dried, then mixed with industrial-grade sodium lignosulfonate and ammonium chloride. After uniform mixing and slurry preparation with water, the mixture is heated to 160-180℃ in an autoclave. Industrial oxygen with a purity of 90% is introduced, and a hydrothermal reaction is carried out for 1.0-3.0 hours while maintaining an oxygen partial pressure of 1.0-1.4 MPa. After the reaction is completed, the mixture is cooled to below 80℃. After pressure relief, solid-liquid separation and washing are performed to obtain a solution rich in copper and zinc, and the filter cake is a conversion slag mainly composed of elemental sulfur, lead sulfate and Fe₂O₃.

During the leaching process, a composite catalytic additive composed of a surfactant and a catalyst in a certain ratio is added. Using water as the leaching agent under the pressurized oxygen hydrothermal condition, copper and zinc in the low-grade complex chalcopyrite are leached out, while impurity elements such as lead and iron are directionally converted and retained in the leaching residue.

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