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<p>Copper anode slime is a valuable resource for extracting precious metals and rare-dispersed metals, such as gold, platinum, selenium and so on. However, the presence of large amounts of antimony, bismuth and other impurities in anode slime reduces the recovery rate of precious metals in the subsequent process of leaching gold by chlorination and extracting silver by sodium sulfite. Furthermore, antinomy and bismuth in anode slime must be comprehensively recovered to realize efficient resource utilization and prevent serious environmental pollution. Herein, copper-removed anode slime was leached by HCl-NaCl-H<sub>2</sub>SO<sub>4</sub> compound chlorides, and the Sb, Bi-containing oxychlorides were then separated by using a sequential hydrolysis strategy. Accordingly, Sb<sub>2</sub>O<sub>3</sub> flame-retardant materials were prepared by simultaneous neutralization and dechlorination. It is revealed that the hydrolysis rate of antimony can be maintained at 98%, when hydrolyzing at 25°C for 60&#xa0;min with dilution ratio of 3:1. Simultaneously, the octahedral cubic crystal Sb<sub>2</sub>O<sub>3</sub> powders with an average particle size of 1.21&#xa0;μm are obtained through a neutralizing-dechlorinating synergy strategy under ultrasonic cavitating for 90&#xa0;min. The prepared cubic-Sb<sub>2</sub>O<sub>3</sub> powders possess good crystallinity and no impurity peak; they are considered a potential candidate for a flame retardant, corresponding to realizing the efficient resource utilization of antimony.</p>

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Chlorination Extraction-Sequential Hydrolysis of Antimony from Copper-Removed Anode Slime and Synergistic Preparation of Sb2O3

  • 期刊论文

  • 发表日期：

    2025年11月10日

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  • Yaru Cui,
  • Jianjun Yang,
  • Guohua Wang,
  • Jinfeng Zhang,
  • Linbo Li,
  • Xihong He,
  • Chaofei Lv,
  • Junfang Nan

摘要

Copper anode slime is a valuable resource for extracting precious metals and rare-dispersed metals, such as gold, platinum, selenium and so on. However, the presence of large amounts of antimony, bismuth and other impurities in anode slime reduces the recovery rate of precious metals in the subsequent process of leaching gold by chlorination and extracting silver by sodium sulfite. Furthermore, antinomy and bismuth in anode slime must be comprehensively recovered to realize efficient resource utilization and prevent serious environmental pollution. Herein, copper-removed anode slime was leached by HCl-NaCl-H2SO4 compound chlorides, and the Sb, Bi-containing oxychlorides were then separated by using a sequential hydrolysis strategy. Accordingly, Sb2O3 flame-retardant materials were prepared by simultaneous neutralization and dechlorination. It is revealed that the hydrolysis rate of antimony can be maintained at 98%, when hydrolyzing at 25°C for 60 min with dilution ratio of 3:1. Simultaneously, the octahedral cubic crystal Sb2O3 powders with an average particle size of 1.21 μm are obtained through a neutralizing-dechlorinating synergy strategy under ultrasonic cavitating for 90 min. The prepared cubic-Sb2O3 powders possess good crystallinity and no impurity peak; they are considered a potential candidate for a flame retardant, corresponding to realizing the efficient resource utilization of antimony.