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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 6    No. 1    March 1996

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THIOUREA LEACHING OF GOLD FROM A CALCINE OF GOLD-BEARING ARSENICAL PYRITE CONCENTRATE
Xu Shengming1,Zhang Chuanfu1,Zhao Tiancong1,Wu Yanjun2

1.Department of Nonferrous Metallurgy,Central South University of Technology,Changsha 410083;
2.Department of Chemistry,Hunan School of Agricultural Mechanization,Changsha 410126

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

 

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

ISSN 1672-7029
CN 43-1423/U

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