氰化尾渣碱法水热浸出脱石英试验  

Research on Desilicication of Cyanide Tailings via Alkaline Hydrothermal Process

作　　者：何超然 丁冲 王晓辉[3] 李昭[3] 郑泉福 He Chaoran1, Ding Chong2, Wang Xiaohui3, Li Zhao3 ,Zheng Quanfu 1(1. Jiangxi Copper Company Limited, Nanchang 330096, China ; 2. School of Materials Science and Technology, China University of Geosciences （ Beijing ） , Beijing 100083, China ; 3. Key Laboratory of Green Process and Engineering, Chinese Academy of Sciences ,Beijing 100190, China)

机构地区：[1]江西铜业股份有限公司,江西南昌330096 [2]中国地质大学(北京)材料科学与工程学院,北京100083 [3]中国科学院绿色过程与工程重点实验室,北京100190

出　　处：《金属矿山》2018年第3期192-195,共4页Metal Mine

基　　金：国家自然科学基金项目(编号:51474199;51774263)

摘　　要：湖南某黄金冶炼厂的氰化尾渣含金5 g/t以上,其中的主要物相为赤铁矿、石英、白云母,石英包裹黄铁矿与金的共伴生体是导致金不能充分与氰化药剂接触的重要原因。为解决此问题,进行了氰化尾渣碱法水热浸出脱石英工艺条件研究。结果表明,氢氧化钠浓度为25%,体积质量比为2 L/kg,浸出温度为160℃,搅拌速度为400r/min,浸出时间为3 h情况下的脱石英率为57.6%。经过该工艺脱石英,金的浸出率可由4.7%提高到38.4%。Cyanide tailings from a gold smelter in Hunan contains more than 5 g/t of gold,and its main phase is hematite, quartz and muscovite. The intergrowth of quartz with inclusion of pyrite and gold is the important reason that gold can not fully contact with cyanide. In order to solve this problem, the conditioning tests of alkaline hydrothermal leaching for desilication of cyanide tailings are carried out. The results show that under the concentration of sodium hydroxide 25% , the volume mass ratio 2 L/kg,the leaching temperature at 160 ℃ ,the stirring speed 400 r/min, and the leaching time for 3 h ,the desilica- tion rate reached 57.6%. Through the process of desilication,the leaching rate of gold is increased from 4.7% to 38. 4%.

关 键 词：氰化尾渣 碱法水热浸出 石英 包裹 

分 类 号：TF042[冶金工程—冶金物理化学]