黄金科学技术 ›› 2021, Vol. 29 ›› Issue (2): 315-323.doi: 10.11872/j.issn.1005-2518.2021.02.104
• 采选技术与矿山管理 • 上一篇
摘要:
为高效回收尾矿资源中的金矿物,对含金尾矿进行了选冶联合试验研究。化学分析结果表明,固体废弃物中的金含量为0.86 g/t。工艺矿物学研究表明,矿样宜采用浮选—浮选金精矿预处理—浸出的选冶联合工艺来回收金。浮选条件试验、开路试验和闭路试验研究结果表明:粗选在Na2CO3用量为500 g/t、(NaPO3)6(六偏磷酸钠)用量为50 g/t、CuSO4用量为75 g/t、异戊基黄药+丁铵黑药用量为120 g/t、松醇油用量为40 g/t的条件下,通过“一次粗选—两次扫选—两次精选”的闭路工艺流程,可获得产率为14.23%、金品位为5.21 g/t、金回收率为86.21%的金精矿。在金精矿磨至-0.037 mm占70.12%的条件下,直接浸出率为41.60%,金的浸出效果不理想,主要原因是大部分金呈微细粒被黄铁矿包裹以及金矿物多为碲金矿、碲金银矿和含金碲银矿等所致;金精矿氧化焙烧—氰化浸出的合适条件为氧化焙烧温度为750 ℃、焙烧时间为60 min、焙砂细度为-0.037 mm占85%、矿浆浓度为33%、矿浆pH值为10.5、NaCN用量为10 kg/t、浸出时间为24 h,在此条件下金的氰化浸出率为73.76%,与金精矿直接氰化指标(金氰化浸出率为41.60%)相比,金的氰化浸出率提高了32.16%。
中图分类号:
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