摘要
贵州某金矿中金主要以包裹形式存在,矿石中载金矿物主要是黄铁矿和毒砂、少量是硅酸盐矿物和碳酸盐矿物。载金矿物很细大多在1～5μm之间,呈超显微状态存在,属含硫砷微细浸染型难选冶金矿。回收该金矿石中金需在碱性介质中进行氧化预处理,使硫化矿物中的硫、砷、锑、铁分别被氧化成硫酸盐、砷酸盐、锑酸盐及赤铁矿,最终导致硫化物晶体的破坏,使其被包裹的金暴露出来,得以用氰化法回收。通过对影响浸出的几个因素:矿石粒度、碱用量、浸出温度、矿浆浓度、氧分压、浸出时间、SAA用量等进行了试验研究,择取优化条件,金的浸出率可达到90.1%。
The gold in an ore in Guizhou mainly exits in the form of parcel. The main gold-bearing minerals are pyrite, arsenopyrite, silicate and carbonate, the particle size of which is 1 -5 μm, existing in the state of ultrami- croscopic and belonging to a fine disseminated type refractory gold ore containing sulfur and arsenic. To recover the gold in the ore, the oxidation pretreatment must be carried on in the alkaline medium to make sulfur, arsenic, anti- mony and iron oxidized into sulfate, arsenate, antimonite and hematite, finally leading to the crystal so that the parceled gold is exposed and at last he cyanidation was used to recover. Experi damage of sulfide ment research was carried on through such factors affecting leaching as ore particle, alkaline dosage, leaching temperature, pulp den- sity, oxygen partial pressure, leaching time and SAA dosage to select optimum condition. Finally, the leaching rate of gold reached 90.1%.
出处
《矿产综合利用》
CAS
2012年第3期34-37,共4页
Multipurpose Utilization of Mineral Resources
关键词
难选冶金矿石
热压预氧化
氰化浸金
Refractory gold ore
Hot-pressure pre-oxidation
Cyanide leaching of gold
