A Pretreatment of Refractory Gold Ores Containing Sulfide Minerals to Improve Gold Leaching by Ammonium Thiosulfate: A Model Experiment Using Gold Powder and Arsenic-Bearing Sulfide Minerals

被引：1

作者：

Mhandu, Takunda Joseph ^{[1
]}

Park, Ilhwan ^{[2
]}

Jeon, Sanghee ^{[3
]}

Hamatsu, Sohta ^{[1
]}

Elakneswaran, Yogarajah ^{[2
]}

Ito, Mayumi ^{[2
]}

Hiroyoshi, Naoki ^{[2
]}

机构：

[1] Hokkaido Univ, Grad Sch Engn, Div Sustainable Resource Engn, Sapporo 0608628, Japan

[2] Hokkaido Univ, Fac Engn, Div Sustainable Resource Engn, Sapporo 0608628, Japan

[3] Akita Univ, Fac Int Resources Sci, Dept Earth Resources Engn & Environm Sci, Akita 0100852, Japan

来源：

METALS | 2023年 / 13卷 / 08期

关键词：

gold; arsenopyrite; ammonium thiosulfate; cyanide; leaching; refractory ores; RAY-PHOTOELECTRON-SPECTROSCOPY; RECOVERY; SURFACE; OXIDES; COPPER; ARSENOPYRITE; ELECTROLYTE; ADSORPTION; BEHAVIOR; OXYGEN;

D O I：

10.3390/met13081357

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The use of thiosulfate to extract gold from refractory ores is promising because of its non-toxicity and high selectivity. Sulfide minerals (i.e., pyrite, arsenopyrite, chalcopyrite), major gold carriers in refractory gold ores, however, hinder gold extraction due to the high consumption of a lixiviant. In this study, a new method to improve gold extraction from sulfide bearing gold ores is proposed based on the model experiments using a mixture of gold powder and arsenopyrite-bearing sulfide (HAsBS) ore. The effects of HAsBS ore on gold leaching in ammonium thiosulfate solutions were investigated, and it was found that gold extraction in the presence of HAsBS ore was suppressed because of the unwanted decomposition of thiosulfate on the surface of sulfide minerals. To improve gold extraction in the presence of the sulfide minerals, this study investigated the effects of the pretreatment of HAsBS ore using ammonium solutions containing cupric ions and confirmed that HAsBS ore was oxidized in the pretreatment and its surface was covered by the oxidation products. As a result, thiosulfate consumption was minimized in the subsequent gold leaching step using ammonium thiosulfate, resulting in an improvement in gold extraction from 10% to 79%.

引用

页数：19

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