缅甸某金矿浸出试验及机理分析  

The leaching test of ore from a gold mine in Myanmar and its mechanism analysis

作　　者：杨婉婷 蓝卓越[1,2,3] 杨迪 李云川 李雄 李行[1,2] 杜云翔 YANG Wanting;LAN Zhuoyue;YANG Di;LI Yunchuan;LI Xiong;LI Hang;DU Yunxiang(College of Land and Resources Engineering,Kunming University of Science and Technology,Kunming Yunnan,650093,China;State Key Laboratory of Clean Utilization of Complex Nonferrous Metal Resources,Kunming Yunnan 650093,China;National and Local Joint Engineering Research Center for Green Comprehensive Utilization of Metal Mine Tailings Resources,Kunming Yunnan,650093,China)

机构地区：[1]昆明理工大学国土资源工程学院,云南昆明650093 [2]省部共建复杂有色金属资源清洁利用国家重点实验室,云南昆明650093 [3]金属矿尾矿资源绿色综合利用国家地方联合工程研究中心,云南昆明650093

出　　处：《矿物学报》2024年第6期879-888,共10页Acta Mineralogica Sinica

摘　　要：缅甸某金矿含金品位为3.29g/t,金主要以独立矿物的形式赋存于银金矿中,少数以类质同象或超显微包裹的形式赋存于黄铁矿、方铅矿、闪锌矿、黄铜矿中,脉石矿物主要有钾长石、石英、白云母、绿泥石、黄铁矿等。该矿石中的铜、铅、锌等有色金属元素以及砷等有害元素含量低且无综合回收价值,但由于金的嵌布粒度粗细不均且存在包裹金的现象,原矿直接浸出或粗磨浸出效果不佳。在工艺矿物学研究的基础上,本文考查了磨矿细度、浸金剂种类、浸金剂绿金用量、助浸剂、固液比、浸出pH值、浸出时间等对金浸出的影响,结果表明,通过细磨和添加助浸剂强化浸出可以提高金的浸出率。在磨矿细度–0.074mm 91.13%,浸出pH值12,绿金用量2000g/t,搅拌转速400r/min,浸出时间12h的试验条件下,金的浸出率为87.93%;添加助浸剂硝酸铅预处理2h,同样浸出条件下金的浸出率可提高到90.03%,硝酸铅的助浸作用主要表现为微电池效应、化学沉淀和钝化膜溶解等。The gold ore from a gold mine in Myanmar has a gold grade of 3.29 g/t.Its gold mainly occurred in the form of independent mineral of argyrite A small amount of gold occurred in forms of isomorphism or ultra-microscopic inclusion in pyrite,galena,sphalerite,and chalcopyrite.Gangue minerals mainly include K-feldspar,quartz,muscovite,chlorite,etc.The contents of non-ferrous metal elements such as copper,lead,zinc,and harmful elements such as arsenic in the ore are low with no comprehensive recovery value.However,due to the uneven distribution of gold particle sizes and the problem of gold inclusion,the original ore's direct leaching of raw ore or the leaching of rough grinded ore are not effective.Based on the process mineralogy research,this paper investigated effects of the grinding fineness,type of gold leaching agent,amount of green gold leaching agent,leaching aid,solid-liquid ratio,pH value of leaching solution,and leaching time on the gold leaching from the ore.The results show that the leaching rate of gold from the ore can be improved by strengthening the leaching effectiveness through the fine grinding of ore and the addition of leaching aid.Under the experimental condition including the ore grinding fineness of-0.074 mm at 91.13%,pH value of 12 for the leaching solution,green gold dosage of 2000 g/t,stirring speed of 400r/min,and leaching time of 12 hours,the leaching rate of gold from ore is 87.93%.When the grinded ore had been pre-treated by adding lead nitrate as the leaching aid for 2 hours and then was leached under the same previous experimental condition,the leaching rate of gold from ore is increased to 90.03%.The leaching effect of lead nitrate is mainly manifested in the micro cell effect,chemical precipitation and passivation film dissolution.

关 键 词：金矿 工艺矿物学 浸金剂 浸出 助浸剂 

分 类 号：TD953[矿业工程—选矿]