Scholarlink

<p>The slag produced during doré smelting comprises a complex matrix of oxides, silicates, sulfates, and residual metal phases, with notable gold and silver contents that position it as a valuable secondary resource. In this work, a 3<sup>2</sup> full factorial design was employed to quantify the individual and interactive effects of temperature (25, 35, and 45&#xa0;°C) and sodium cyanide concentration (2.6, 4.7, and 6.9&#xa0;g/L) on precious‐metal extraction via cyanidation. Analysis of Variance confirmed that temperature, sodium cyanide dosage, and their synergy each exert highly significant influences on gold (F<sub>A</sub> = 207, F<sub>B</sub> = 127.2, F<sub>A×B</sub> = 69.5; p-value &lt; 0.01) and silver (F<sub>A</sub> = 62.5, F<sub>B</sub> = 57.7, F<sub>A×B</sub> = 42.4; p-value &lt; 0.01) extraction. Response‐surface modeling (R<sup>2</sup> = 0.99) identified the optimal operating window, 45&#xa0;°C and 6.9&#xa0;g/L NaCN, yielding 93.2% gold extraction and 29.8% silver extraction. Low silver dissolution was linked to refractory mineral phases and surface passivation, as revealed by SEM–EDS imaging, which showed Fe‐oxide and aluminosilicate encapsulation of precious‐metal clusters. This study delivers a robust framework for doré slag valorization and underscores the need for targeted pretreatment strategies to overcome silver‐specific extraction barriers and advance circular‐economy objectives in metallurgical waste management. Given the scarcity of prior studies addressing the cyanidation behavior of doré slag, this work constitutes the first factorial design study quantifying cyanidation parameters in doré slag, providing a novel basis for industrial implementation optimized recovery strategies.</p> Graphical Abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Resource Circularity in Doré Slag Cyanidation: Effects of Temperature and Sodium Cyanide Concentration on Gold and Silver Extraction

  • 期刊论文

  • 发表日期：

    2025年10月28日

查看全文
  • G. I. Dávila-Pulido,
  • D. A. Charles,
  • B. R. González-Bonilla,
  • A. A. González-Ibarra,
  • A. Salinas-Rodríguez,
  • G. Chávez-Puente

摘要

The slag produced during doré smelting comprises a complex matrix of oxides, silicates, sulfates, and residual metal phases, with notable gold and silver contents that position it as a valuable secondary resource. In this work, a 32 full factorial design was employed to quantify the individual and interactive effects of temperature (25, 35, and 45 °C) and sodium cyanide concentration (2.6, 4.7, and 6.9 g/L) on precious‐metal extraction via cyanidation. Analysis of Variance confirmed that temperature, sodium cyanide dosage, and their synergy each exert highly significant influences on gold (FA = 207, FB = 127.2, FA×B = 69.5; p-value < 0.01) and silver (FA = 62.5, FB = 57.7, FA×B = 42.4; p-value < 0.01) extraction. Response‐surface modeling (R2 = 0.99) identified the optimal operating window, 45 °C and 6.9 g/L NaCN, yielding 93.2% gold extraction and 29.8% silver extraction. Low silver dissolution was linked to refractory mineral phases and surface passivation, as revealed by SEM–EDS imaging, which showed Fe‐oxide and aluminosilicate encapsulation of precious‐metal clusters. This study delivers a robust framework for doré slag valorization and underscores the need for targeted pretreatment strategies to overcome silver‐specific extraction barriers and advance circular‐economy objectives in metallurgical waste management. Given the scarcity of prior studies addressing the cyanidation behavior of doré slag, this work constitutes the first factorial design study quantifying cyanidation parameters in doré slag, providing a novel basis for industrial implementation optimized recovery strategies.

Graphical Abstract