ABSTRACT Arsenic can cause environmental pollution and also affect mineral processing efficiency. To determine the mechanism of separating arsenic from minerals, microwave roasting tests were conducted using Hunan arsenic sulfide gold concentrate as a raw material. The heating behaviour of gold concentrates under microwave irradiation was analysed. The effects of roasting temperature, reaction time, and oxygen content on arsenic removal were investigated. Temperature has the greatest effect on arsenic removal, followed by reaction time and oxygen content. The optimum parameters were determined experimentally. The removal rate of arsenic was 93.16% (gas supply: 4 L min−1, reaction temperature: 650°C, duration: 15 min). Scanning electron microscopy analysis of the minerals after microwave roasting and conventional roasting showed that there are more cracks on the surface of minerals after microwave roasting, and the specific surface area is larger. The reaction mechanism of arsenic separation from gold concentrate during microwave roasting is discussed.

中文翻译：

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通过微波焙烧使金精矿脱砷

摘要 砷会造成环境污染，也会影响选矿效率。为确定从矿物中分离砷的机理，以湖南硫化砷金精矿为原料进行了微波焙烧试验。分析了金精矿在微波辐射下的加热行为。考察了焙烧温度、反应时间和含氧量对除砷的影响。温度对除砷的影响最大，其次是反应时间和氧含量。最佳参数通过实验确定。砷的去除率为93.16%（气源：4 L min-1，反应温度：650°C，持续时间：15 min）。微波焙烧和常规焙烧后矿物的扫描电镜分析表明，微波焙烧后矿物表面裂纹较多，比表面积较大。讨论了微波焙烧金精矿脱砷的反应机理。