摘要
针对某难处理金精矿,采用焙烧—氰化提金工艺。试验得到的最佳条件:金精矿粒度为-0.043 mm占52.85%,一段焙烧温度为450℃,焙烧时间为1 h(炉门关闭),二段焙烧温度为700℃(炉门稍开),焙烧时间为0.5 h;初始Na CN浓度为0.5‰,L/S=4,氰化时间为24 h。在此条件下,硫、砷的脱除率分别为99.99%和52.56%,金的浸出率为88.92%。
Focusing on the refractory gold concentrate in northwest region,the technology of roasting-cyanidation was studied and the optimized condition was obtained.Experimentation results show that the removal rate of S and As are 99.99% and 52.56%respectively,and the gold leaching rate is above 88.92%under these conditions：-0.043 mm was about 52.85%,the one stage roasting with the temperature of 450℃and time of 1 hour,two stages roasting with the temperature of 700℃and time of 0.5 hour.The best cyanide-leaching parameters are initial densities of sodium cyanide is 0.5‰,the liquid-solid ratio is 4 and time of 24 hours.
出处
《黄金科学技术》
CSCD
2014年第6期77-81,共5页
Gold Science and Technology
基金
国家自然科学基金项目"载金黄铁矿化学溶解特性与生物促进机制"(编号:51474075)
福建省杰出青年基金项目"低品位难处理金矿生物堆浸基础理论研究"(编号:2011J0103)联合资助
关键词
难处理金精矿
焙烧氧化
提金工艺
refractory gold concentrate
roasting
technology of gold extraction
