某毒砂金矿硫氰酸盐铵性体系加压氧化提金探索试验-有色金属（冶炼.DOC

某毒砂金矿硫氰酸盐氨性体系加压氧化提金探索试验 胡燕清，杨声海陈永明中南大学 冶金科学与工程学院410083） 摘要：对某毒砂金矿进行了硫氰酸盐氨性体系氧压提取金的探索试验，考察了反应温度Cu2+浓度浸出时间液固比氨水浓度氧分压硫氰酸铵浓度等对金浸出率的影响。在优化条件硫氰酸铵浓度3 mol/L，液固比5∶1反应温度150 ℃，浸出6 h，搅拌速度750 r/min，氨水浓度4.64 mo/L，铜加入量1.5 g/L，金浸出率为61.7%。而经焙烧预处理后金浸出率86.2%。 关键词：难处理金矿；硫氰酸铵；毒砂Exploration Test on Gold Extraction from Arsenopyrite Gold Concentrate with Oxidation Pressure Leaching Process in Ammonium Thiocyanate-Ammonia System HU Yan-qing, YANG Sheng-hai, CHEN Yong-ming, LIU Qing （School of metallurgical science and engineering, Central South University, Changsha 410083, China） Abstract: The exploration test on gold extraction from arsenopyrite gold concentrate with oxidation pressure leaching process in ammonium thiocyanate-ammonia system was performed. The effects of leaching temperature，copper concentration, leaching time, ratio of liquid to solid (L/S), ammonia concentration , oxygen pressure, and the concentration of ammonium thiocyanate on gold leaching rate were studied. The results show that the gold leaching ratio is 61.7% under the optimum conditions including NH4SCN concentration of 3 mol/L, L/S=5, leaching temperature of 150 ℃, leaching time of 6 hours, stirring speed of 750 r/min, ammonia concentration of 4.64 mol/L, and copper dosage of 1.5 g/L. The gold leaching ratio can leach 86.2% after the pretreatment of roasting at 400 ℃. Key words: refractory gold concentrate; ammonium thiocyanate; arsenopyrite; oxidation pressure leaching 随着黄金工业的发展，易被直接氰化处理的金矿资源日益衰竭，难处理金矿尤其是高砷难处理硫化金矿将逐渐成为黄金提取的主要原料。高砷难处理硫化金矿中毒砂(FeAsS)和黄铁矿(FeS2)是主要的载金矿物，金主要以微细粒或显微状态包裹在其中或浸染在晶体中，即使细磨难以达到单体解离[1]。 氰化物提金工艺成熟，浸出率高，经济效益好，生产过程稳定，易于操作，然而氰化物有剧毒，对金的浸出速率缓慢，不能有效处理含砷高、含硫高的难理金矿，的金浸出试剂。 一种有可能取代氰化物的试剂就是硫氰酸盐，1905年White首先报道了硫氰酸盐具有溶解金的能力[2]，直到1986年Fleming才重启此领域的大门[3]。Barbosa Filho等在pH 12条件下以Fe3+作氧化剂用硫氰酸盐浸出金[4]，发现金浸出率高浸出速度快，认为硫氰酸盐一种有效的金浸出剂，具有与硫脲浸金一样的高溶解速率。 Kholmogorov等利用硫氰酸钾溶液从难处理含砷黄铁矿中浸取金[5]，在KSCN浓度0.4 mol/L，pH 25的弱酸性条件下常温浸出4 h，金浸出率可达95%。郭欢等采用NH4SCN+NaOH体系[6]，在最佳条件下金浸出率可达95.29%。国内有关硫氰酸盐提金多采用酸性条件下进行[7-10]。由于酸性环境对设备的防腐要求