A method for selectively recovering iron from high-iron tungsten smelting slag by hydrogen reduction-magnetic separation

By combining selective hydrogen reduction and magnetic separation, the problems of low iron recovery efficiency and tungsten loss in high-speed ferro-tungsten smelting slag have been solved, achieving efficient and clean iron recovery and tungsten separation, which is suitable for the resource utilization of high-speed ferro-tungsten smelting slag.

CN122168892APending Publication Date: 2026-06-09SOUTH CHINA UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SOUTH CHINA UNIV OF TECH
Filing Date
2026-04-01
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing technologies are difficult to efficiently and cleanly recover iron from high-speed tungsten smelting slag, and are prone to causing the loss of valuable tungsten and high energy consumption.

Method used

A method combining selective hydrogen reduction and magnetic separation is employed. Under mild conditions, a mixture of sodium carbonate and borax is used as a flux to selectively reduce weakly magnetic iron oxides with hydrogen, converting them into strongly magnetic magnetite. Subsequently, magnetic separation is carried out to achieve efficient enrichment of iron and effective separation of tungsten.

Benefits of technology

It achieves efficient and clean recovery of iron from high-speed tungsten smelting slag, with an iron recovery rate of over 90%. Tungsten is enriched in magnetic separation tailings, avoiding tungsten loss and reducing energy consumption and environmental pollution.

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Abstract

This invention belongs to the field of metallurgical solid waste resource utilization technology, specifically relating to a method for selective hydrogen reduction-magnetic separation to recover iron from high-iron tungsten smelting slag. The method includes the following steps: crushing, grinding, and drying the high-iron tungsten smelting slag; then adding a flux and mixing evenly, wherein the flux is a mixture of sodium carbonate and borax; placing the pretreated slag in a reduction furnace, first introducing an inert gas for deoxygenation, then introducing a H₂-Ar mixed reducing atmosphere, and heating to 700-900℃ for selective reduction treatment; cooling, crushing, and grinding the reduced product, and then performing magnetic separation treatment to obtain high-grade iron concentrate and magnetic separation tailings. This invention achieves efficient enrichment and recovery of iron under mild conditions, while avoiding the reduction loss of valuable elements such as tungsten, laying the foundation for the full-component resource utilization of slag.
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