The leaching test of ore from a gold mine in Myanmar and its mechanism analysis
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.
gold minesprocess mineralogyleaching agentleachingleaching aids
万方数据
维普
