THIOUREA LEACHING OF GOLD FROM A CALCINE OF GOLD-BEARING ARSENICAL PYRITE CONCENTRATE

来源期刊：中国有色金属学报(英文版)1996年第1期

论文作者：Xu Shengming Zhang Chuanfu Zhao Tiancong Wu Yanjun

文章页码：21 - 24

Key words：gold-bearing arsenical pyrite concentrate ;calcine ; thiourea leaching of gold

Abstract: The thiourea leaching of gold from the calcine of gold--bearing arsenical pyrite concen-trate of Kangjiawan mine was studied. The effects of the leaching time，the concentrations of thiourea,hydrochloric acid and initial ferric ion on the leaching recovery of gold were investigated，and a regres-sive model has been established，which showed that the concentrations of thiourea and hydrochloric acid were the most important factors，leaching time the second，and concentration of the initial ferric ion the least. Under the optimal conditions，that is，temperature 50 ℃，the ratio of liquid to solid 4:1，thiourea 12 g/L，hydrochloric acid 1 mol/L，and initial ferric ion 1 g/L, the leaching recoveries of gold and silver were more than 81％and 73 ％，respectively. The increase of silver recovery and the reduc-tion of thiourea consumption could 6e attained when sodium sulphite was added