加压催化氧化氨浸法处理坪定金矿的研究和新工艺开发

Research on Ammonia Leaching of Pingding Gold Ore in Pressure Oxidation Process

坪定金矿是富金高砷高碳难处理金矿,所含砷化合物为雌黄和(或)雄黄,普通处理工艺金的氰化率较低。针对坪定金矿特点,提出"加压催化氧化氨浸法",成功地实现了坪定矿中金的有效回收。通过向氨性溶液中加入硫磺使雄黄转化为易溶于氨水中的雌黄,再通过氨水将矿物中的雄黄去除。最后,利用Cu2+的催化作用促使砷脱除过程中在金矿表面所形成的不溶性硫膜氧化,便于后续氰化提金的进行。经过该方法处理后的坪定金矿矿石金的氰化率可达到92%以上。由于采用氨性环境,该工艺中所用设备材料都为普通钢材,设备投资小,运行成本低,经济效益高,2年内可实现盈利。

Pingding gold ore,which containing high level of carbon,arsenic （orpiment and （or） realgar）,is a refractory gold.Its gold extraction ratio is very low by common treatment process.The gold extraction ratio increases up to 92% after treating by pressure oxidation of ammonia leaching process, invented by authors.By adding sulfur, realgar could convert to orpiment in ammonia, and could dissolve in ammonia and be removal.At last,an insoluble sulfur film formatted by arsenic removal on gold ore particle oxidizes by Cu^2＋ catalyst.The costs of equipment and operation are significantly reduced than those of traditional pressure oxidation process because of its ammonia environment.Profitability could be achieved within two years.