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Abstract <p>The efficiency of slag-copper separation is a key factor limiting copper recovery rates during converting. This study employed the sessile drop method to investigate the interfacial characteristics between calcium ferrite slag, fayalite slag, and ferrous calcium silicate slag with low-grade matte, high-grade matte, and blister copper, while also analyzing the reaction behavior within the interfacial interaction layer. Results show that, affected by interfacial reactions, the calcium ferrite slag exhibits the poorest separation performance with low-grade matte at 1150 °C to 1250 °C, showing a contact angle of only 7 to 27 deg, and the contact angle is 7 deg, corresponding to an interfacial tension of 405 mN/m when the slag melts. In contrast, the ferrous calcium silicate slag achieves optimal separation with blister copper, with a contact angle of 84 to 116 deg, and the contact angle is 59 deg, corresponding to an interfacial tension of 1040 mN/m when the slag melts.Additionally, the separation efficiency of all three slags with matte/blister copper gradually improves as the oxidation degree increases during converting. This study provides a reference for improving the slag-copper separation efficiency during converting.</p> Graphical Abstract <p></p>

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Separation of Matte/Blister Copper from Three Typical Slags Based on Wetting Characteristics

  • 期刊论文

  • 发表日期：

    2026年7月10日

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  • Guangyu Zhang,
  • Ba Zhang,
  • Yingbao Yang,
  • Yanxiong Fu,
  • Xiaolv Yu,
  • Shiwei Zhou,
  • Yonggang Wei,
  • Bo Li,
  • Hua Wang

摘要

Abstract

The efficiency of slag-copper separation is a key factor limiting copper recovery rates during converting. This study employed the sessile drop method to investigate the interfacial characteristics between calcium ferrite slag, fayalite slag, and ferrous calcium silicate slag with low-grade matte, high-grade matte, and blister copper, while also analyzing the reaction behavior within the interfacial interaction layer. Results show that, affected by interfacial reactions, the calcium ferrite slag exhibits the poorest separation performance with low-grade matte at 1150 °C to 1250 °C, showing a contact angle of only 7 to 27 deg, and the contact angle is 7 deg, corresponding to an interfacial tension of 405 mN/m when the slag melts. In contrast, the ferrous calcium silicate slag achieves optimal separation with blister copper, with a contact angle of 84 to 116 deg, and the contact angle is 59 deg, corresponding to an interfacial tension of 1040 mN/m when the slag melts.Additionally, the separation efficiency of all three slags with matte/blister copper gradually improves as the oxidation degree increases during converting. This study provides a reference for improving the slag-copper separation efficiency during converting.

Graphical Abstract