Method for comprehensive recovery of copper and zinc smelting slag in coordination

CN121674716BActive Publication Date: 2026-06-19CINF ENG CO LTD

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner: CINF ENG CO LTD
Filing Date: 2026-02-10
Publication Date: 2026-06-19

AI Technical Summary

Technical Problem

Existing copper smelting slag valuable metal recovery processes suffer from problems such as high energy consumption, ineffective recovery of Pb and Zn, high heavy metal content in tailings, and significant environmental pollution risks, making it difficult to meet the requirements of low-carbon, high-efficiency, and comprehensive utilization of solid waste.

Method used

High-sulfur zinc slag produced by oxygen pressure leaching zinc smelting process is used as a sulfiding agent to directly treat hot copper smelting slag. Cu, Pb, Zn and Fe are enriched and recovered through the first and second smelting processes, eliminating the need for slow cooling and sorting and secondary heating processes. Multiphase separation is carried out by high-temperature smelting process to form secondary zinc oxide dust, matte, molten iron and water quenched slag.

Benefits of technology

It achieves high-efficiency recovery of Cu, Pb, Zn and Fe, reduces energy consumption, reduces the heavy metal content in tailings, produces water-quenched slag that can be used in building materials, and reduces the risk of environmental pollution.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention provides a method for the synergistic and comprehensive recovery of copper and zinc smelting slag, comprising: adding hot copper smelting slag and high-sulfur zinc slag into a smelting furnace, blowing oxygen-enriched air and pulverized coal fuel into the furnace for a first smelting process, producing a first flue gas, sulfide melt, and a first smelting slag; separating the sulfide melt and the first smelting slag, using the obtained first smelting slag as raw material, adding calcium flux, and performing a second smelting process to produce molten iron, a second smelting slag, and a second flue gas. This process achieves waste-to-waste treatment without the need for additional slag-forming agents or sulfiding agents, significantly reduces energy consumption, and produces low Fe, Cu, Pb, and Zn content in the tailings, posing no pollution risk. It also achieves a high comprehensive recovery rate for Cu, Pb, Fe, and Zn, while the products show good separation of valuable metal elements and high grades, which helps reduce the difficulty of subsequent secondary separation and recovery of valuable metals.

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