摘要
为了促进对低品位金矿资源的回收利用,在对潼关地区低品位含金氧化矿石的化学成分和矿石特征进行研究的基础上,开展矿石可浸性、泥化程度检查、NaCN浓度、喷淋强度、吸水性、渗透性和初始耗碱量等条件试验,对其氰化浸出性能及影响因素进行了试验研究。研究认为,潼关地区低品位金矿石氧化程度较低,属原生矿—半氧化矿石的过渡类型;矿石裂隙不发育,岩石结构紧密,且自然金以中—粗粒为主,属不易堆淋矿石;矿石氰化有害元素含量低,在可浸性试验中,经24 h机械搅拌获得浸出率为95.2%,为良好的可浸性矿石。条件试验及综合柱浸试验获得-8 mm粒级矿石27 d浸出率为66%,说明此类矿石仍为堆淋有效矿石,其堆淋最佳生产工艺技术条件:矿堆规模5 000 t,粒级-8 mm,筑堆高度3 m,NaCN浓度0.03%～0.06%,pH值10～12,喷淋强度20～50 L(/m2.h),喷淋时间30 d。从试验结果来看,该类矿石堆淋浸金回收率偏低,只有在开采富矿同时作为废矿石回收利用才能获得效益。由于此类低品位矿石氧化程度差,为良好的可浸性矿石,因此最佳方法应为全泥氰化法。
In order to promote the recycling of low grade gold resources, many conditional experiments aDOUt ore leaching,mudding degree,concentration of NaCN, sprinkling,obsorbency,permeability and origin caustic con - sumption are carried out to study the cyanide leaching character and affecting factors,on the basis of research on chemical composition and ore character of low grade oxided gold ore.The results show that low grade gold ore in Tongguan area is a transitional type between primary ore and half oxidized ore which is of low oxidization level;it is a kind of ore which is hard to leach with undeveloped fracture and tight rock structure, and the natural gold is composed mainly of medium and coarse grain;it is also a kind of leachable ore with low level of harmful elements the leaching rate of which is 95.2% in a leachability test.The rate of 27 days leaching of -8 mm ore obtained from the conditional and composite column leaching experiments is 66% ,which shows that the ore is leachable, and the leaching production technique conditions are 5 000 tons ore per heap,-8 ram fraction,3 m heap height,NaCN concentration is 0.03% to 0.06%,pH value is 10 to 12,the volume of sprinkling is 20-50 U（m2.h） and the time of sprinkling is 30 days.The results of experiment show that the recycle rate of this kind of ore is low, benefit can be achieved only if it can be recycled as waste ore when bonanza is mined.Because this kind of low grade ore is pretty leachable, and the oxidation degree is low, the best way is all-slime cyanidation.
出处
《黄金科学技术》
CSCD
2013年第3期85-90,共6页
Gold Science and Technology
关键词
金
氰化
可浸性
工艺方案
试验研究
gold
eyaniding
leaching process scheme
experimental investigation
