Gold recovery from roasted refractory gold concentrate through cyclic extraction using MnO2-assisted thiocyanate leaching and cementation with zinc powder

IF 4.8 2区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING
Weiyao Li, Bo Liu, Jiajia Wu, Wei Liu, Fen Jiao, Wenqing Qin
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引用次数: 0

Abstract

Cyanidation has long served as the industrial standard in the gold industry, necessitating heightened attention to cyanide management owing to its inherent toxicity. This study developed a novel MnO2-assisted thiocyanate leaching system as an alternative to cyanide. The sample was generated from a refractory gold concentrate processed by roasting, containing 54.4 g/t gold with iron oxide and quartz as the major mineral phases. Within the framework of the novel system, gold recovery was investigated in terms of gold association, recovery behavior, thermodynamics, and optimization using cyclic extraction protocols. The most suitable leaching conditions were determined as 1.20 mol/L NaSCN, 4.00 mmol/L MnO2, pH at 1.00, liquid-to-solid ratio of 4 mL/g, and leaching duration of 24 h, resulting in a maximum gold extraction of 94.8%. Subsequent zinc precipitation facilitated a gold recovery of 99.4% from the leachate. Furthermore, the implementation of a cyclic extraction scheme, coupled with reagent addition to offset consumption, yielded a significant thiocyanate dosage reduction by 75% while maintaining gold recovery. This acidic leaching system yields satisfactory gold recovery with minimized reagent consumption, particularly suited for refractory gold ore that has undergone acidic pretreatment.

利用二氧化锰辅助硫氰酸浸出和锌粉固结循环萃取法,从焙烧难选金精矿中回收黄金
长期以来,氰化法一直是黄金行业的工业标准,由于其固有的毒性,氰化物的管理必须受到高度关注。本研究开发了一种新型二氧化锰辅助硫氰酸浸出系统,作为氰化物的替代品。样品来自经焙烧处理的难选金精矿,含金 54.4 克/吨,主要矿物相为氧化铁和石英。在该新型系统的框架内,从金的关联、回收行为、热力学以及循环萃取方案的优化等方面对金的回收进行了研究。最合适的浸出条件被确定为 1.20 mol/L NaSCN、4.00 mmol/L MnO2、pH 值为 1.00、液固比为 4 mL/g、浸出时间为 24 小时,因此金的最大提取率为 94.8%。随后的锌沉淀使浸出液中的金回收率达到 99.4%。此外,循环萃取方案的实施,加上试剂添加以抵消消耗,在保持金回收率的同时,硫氰酸盐用量大幅减少了 75%。这种酸性浸出系统能以最小的试剂消耗获得令人满意的金回收率,尤其适用于经过酸性预处理的难选金矿石。
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来源期刊
Hydrometallurgy
Hydrometallurgy 工程技术-冶金工程
CiteScore
9.50
自引率
6.40%
发文量
144
审稿时长
3.4 months
期刊介绍: Hydrometallurgy aims to compile studies on novel processes, process design, chemistry, modelling, control, economics and interfaces between unit operations, and to provide a forum for discussions on case histories and operational difficulties. Topics covered include: leaching of metal values by chemical reagents or bacterial action at ambient or elevated pressures and temperatures; separation of solids from leach liquors; removal of impurities and recovery of metal values by precipitation, ion exchange, solvent extraction, gaseous reduction, cementation, electro-winning and electro-refining; pre-treatment of ores by roasting or chemical treatments such as halogenation or reduction; recycling of reagents and treatment of effluents.
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