进行了难处理高砷金精矿回转窑、沸腾炉两段焙烧、氰化提金工业试验, 金浸出率只有80%左右, 氰化尾渣含金高达20 g·t-1. 对回砖窑焙烧矿分粒级后进行二次焙烧和氰化, 结果表明金浸出率与焙烧矿的团聚粒度密切相关, 直径大于5 mm的粗颗粒焙烧矿浸出率达到90%, 小于5 mm焙烧矿浸出率只有72%. 细分粒级研究表明, 粒度越小, 金浸出率越低. 氰化渣金物相分析表明, 未浸出的金主要是氧化铁包裹金. 电子显微镜形貌研究表明, 较细回砖窑焙烧矿存在严重的过烧, 氧化铁包裹金主要发生在细团聚颗粒矿物上. 回砖窑补热方式不合理是造成过烧的主要原因.
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