The Search for a Process to Recover Gold from an Extra-refractory Gold Ore
An extra-refractory gold ore in China belongs to Carlin Type Gold Ore which is not only submicroscopic but also rich in arsenic and organic carbon. They have been proved that its floatability is not good enough and the gold in the ore could not be leached almost if it was not pretreated.The tests for the ore were carried out in accordance with flotation-concentrate preoxidation-cyanidation(or CIL) processes in order to exploit the mine. Two new depressants were discovered in the flotation tests and improved concentrate grades from about 20g/t to 32～50g/t. The methods of the concentrate preoxidation tests were alkaline atmospheric oxidation, acidic atmospheric oxidation, acidic pressure oxidation, roasting oxidation, biooxidation. The cyanidation tests after the concentrate preoxidation have proved the gold extraction of the pressure oxidation to be the highest(92.5%) and that of roasting secondary(89.3%). After fuller techno-economic comparison, it is suggested that the flotation-pressure oxidation or roasting-CIL process should be the most optimal for treating the ore. The gold recoveries of the ore were 83% for the pressure oxidation and 80% for the roasting respectively.
Extra-refractory gold ore Flotation Preoxidation Pressure oxidation Roasting oxidation Cyanidation.
H. Z. Liu Z. M. Sun J. Chen S. Liu
ZiJin Mining Group Co., Ltd., China. ZiJin Mining Group Co., Ltd. China
国际会议
XXIV International Mineral Processing Congress(第24届国际矿物加工大会)
北京
英文
1740-1745
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）