Suspension Roasting in Enhancing Gold Leaching Efficiency and Modifying Pore Structure in High-Sulfur, Carbonaceous, Arsenic-Bearing Refractory Gold Ores

IF 2.3 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

JOM Pub Date : 2025-08-21 DOI:10.1007/s11837-025-07609-3

Hua Dong, Jianping Jin, Xinran Zhu, Yanjun Li, Yuexin Han

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Abstract

As one of the primary sources for gold recovery, the recovery efficiency of gold from high-sulfur-containing carbon and arsenic refractory gold ore is far from satisfactory. The suspension roasting process can enhance the gold leaching effect. According to thermodynamic analysis, sulfur and arsenic are oxidized into gaseous products, while ankerite and muscovite are decomposed. The experimental results showed that two-step suspension roasting achieved a higher leaching rate than one-step roasting for such ore. Under the condition of two-step suspension roasting, the gold leaching rate reached 84.77%. Suspension roasting increased the distribution rate of gold in bared and semi-bared forms while reducing the arsenic distribution rate in arsenopyrite. Analysis of the calcine’s pore structure indicated that increasing roasting temperature, time, and oxygen concentration promotes pore formation. However, excessively high parameters may lead to sintering and the "secondary wrapping" of arsenic, which blocks pore structures, hinders contact between gold and leaching agents, and ultimately reduces leaching efficiency.

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悬浮焙烧提高高硫、碳质、含砷难浸金矿金浸出效率及改变孔隙结构

高含硫碳砷难选金矿石作为金的主要回收来源之一，其金的回收率还不理想。采用悬浮焙烧工艺可以提高浸金效果。根据热力学分析，硫和砷被氧化为气态产物，而铁云母和白云母被分解。试验结果表明，该矿石两步悬浮焙烧的浸出率高于一步焙烧，在两步悬浮焙烧条件下，金浸出率达到84.77%。悬浮焙烧提高了裸态和半裸态金的分布速率，降低了毒砂中砷的分布速率。对煅烧物孔隙结构的分析表明，提高焙烧温度、焙烧时间和氧气浓度有利于孔隙的形成。但过高的参数可能导致砷的烧结和“二次包裹”，从而堵塞孔隙结构，阻碍金与浸出剂的接触，最终降低浸出效率。

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来源期刊

JOM 工程技术-材料科学：综合

CiteScore

4.50

自引率

3.80%

发文量

540

审稿时长

2.8 months

期刊介绍： JOM is a technical journal devoted to exploring the many aspects of materials science and engineering. JOM reports scholarly work that explores the state-of-the-art processing, fabrication, design, and application of metals, ceramics, plastics, composites, and other materials. In pursuing this goal, JOM strives to balance the interests of the laboratory and the marketplace by reporting academic, industrial, and government-sponsored work from around the world.