A synergistic deep treatment process for red mud and non-ferrous metallurgical slag

By using a synergistic deep treatment process of red mud and non-ferrous metallurgical slag, the problems of kiln ring formation and molten iron oxidation in non-ferrous metallurgical slag smelting have been solved, achieving efficient separation and resource utilization of multiple metals, reducing energy consumption and emissions, and improving economic benefits.

CN120519692BActive Publication Date: 2026-03-10QINGDAO JINQUAN SHIXIN ENVIRONMENTAL PROTECTION TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-05-16
Publication Date
2026-03-10

AI Technical Summary

Technical Problem

The existing non-ferrous metallurgical smelting process has problems such as the volatilization of low-melting-point metals such as zinc and lead, which leads to ring formation on the inner wall of the kiln, a decrease in the oxidation rate of molten iron, and waste of residual heat. Traditional processes are difficult to achieve large-scale, efficient, and environmentally friendly resource utilization.

Method used

Red mud and non-ferrous metallurgical slag are mixed in a certain proportion, and composite additives are added to form pellets. These pellets are then reduced at high temperature in a stainless steel cylindrical reduction furnace, followed by smelting in a gas-fired rotary kiln. Combined with protective gas and multi-stage condensation, the pellets are finally separated and recycled through waste heat recovery and purification. This process achieves efficient separation and resource utilization of multiple metals.

Benefits of technology

It solved the problem of ring formation in the kiln, improved the purity and yield of molten iron, reduced energy consumption and emissions, achieved efficient recycling and resource utilization of multiple metals, and reduced production costs.

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Abstract

This invention belongs to the field of metallurgical and mineral engineering technology, specifically disclosing a synergistic deep treatment process for red mud and non-ferrous metallurgical slag. The invention involves finely grinding and mixing red mud and non-ferrous metallurgical slag, adding composite additives (semi-coke, CaF2, and Na2SiO3), pressing them into high-strength pellets, drying them, and then feeding them into a stainless steel cylindrical reduction furnace (lined with SiC-MgO-ZrO2 composite material and equipped with an external water-cooled jacket) for high-temperature reduction. Zinc and lead vapors are condensed and recovered, and the reduction product is fed into a gas-fired rotary kiln for smelting. Smelting is carried out under argon-nitrogen mixed gas protection, natural gas-oxygen combustion, and mechanical stirring, separating high-purity molten iron and silicate slag. This invention solves the problems of zinc and lead corrosion, molten iron oxidation, and high-pollution emissions associated with traditional processes through multi-slag synergistic proportioning, a stainless steel cylindrical reduction furnace, cascade utilization of waste heat, and tail gas purification. It is suitable for large-scale industrial treatment of metallurgical solid waste.
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Citation Information

Patent Citations

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    CN112375856A

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  • Recycling process of non-ferrous alloy in industrial solid hazardous waste

    CN112063845A