甘肃省某低品位金矿选矿试验研究  

Experimental research on beneficiation of a low-grade gold ore in Gansu province

作　　者：赵民[1] 吴天娇[2] 赵国斌[1] 郭月琴[2] 李元茂[3] 杨鹏飞[1] 李普涛[1] 

机构地区：[1]中国地质调查局西安地质调查中心,陕西西安710054 [2]西北有色地质研究院,陕西西安710054 [3]甘肃省地质调查院,甘肃兰州730000

出　　处：《中国矿业》2015年第9期110-114,共5页China Mining Magazine

基　　金：中国地质调查局地质矿产调查评价专项"北山-祁连成矿不定期地质矿产调查"计划项目子项目"北山-祁连成矿带矿产资源潜力调查"资助(编号:12120113047300)

摘　　要：甘肃某金矿为低品位氧化矿石,金矿物为自然金,自然金颗粒以微细粒为主,且有37.04%以包裹金形式赋存。在矿石特征分析的基础上进行了常规浮选、重选、全泥氰化三种工艺流程对比,最终确定用全泥氰化工艺回收金。通过全泥氰化指标各影响因素的优化探讨试验,得出了最佳选别条件:磨矿细度-200目占85%、保护碱石灰用量为2000g/t、PH=10-11、氰化钠用量800g/t、浸出时间4h、矿浆浓度40%、底炭密度15g/L、吸附时间8h。在此条件下,进行氰化炭浸综合条件平行试验,可获得金浸出率93.15%、金吸附率99.45%、金总回收率92.63%的较好指标。A gold ore in Gansu Province is a low-grade oxidized ore. Gold mineral is natural gold,which mainly exists as fine grain gold,and occurs as wrapped gold , accounting for 37.04 %. Based on analysis of the gold ore characters, the three schemes of conventional floatation, gravity separation and all-slirning cyanidation were carried out. By comparing the three processes, all-sliming cyanidation was confirmed to recover gold as the best process. The optimal conditions were achieved by optimizing the influence factors of all-sliming cyanidation index, they are grinding size of 85%,--200mesh,PH is 10-11, protective alkali of CaCO3 2000g/t, leaching time 4 hours, pulp concentration 40%, The bottom carbon density 15g/l, adsorption time 8 hours. Comprehensive conditions parallel test of cyanide carbon-in-leach was carried out at the optimal conditions,and 90% of gold leaching rate, 99. 45% of gold adsorption rate and 92. 63% of total gold recovery rate can be obtained.

关 键 词：低品位 金矿 氧化矿 全泥氰化 

分 类 号：TD953[矿业工程—选矿]