Strengthening leaching effect of Carlin-type gold via high-voltage pulsed discharge pretreatment  

作　　者：Peng Gao Yong-hong Qin Yue-xin Han Yan-jun Li Si-ying Liu 

机构地区：[1]College of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China [2]National-local Joint Engineering Research Center of High-efficient Exploitation Technology for Refractory Iron Ore Resources,Shenyang 110819,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2021年第6期965-973,共9页矿物冶金与材料学报（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China(No.51974063);the Fundamental Research Funds for the Central Universities,China(No.N180104016).

摘　　要：A high-voltage pulsed discharge(HVPD)pretreatment was used to strengthen the leaching effect of Carlin-type gold ore containing arsenic.Optimal results of the pretreatment experiments were obtained at the following operating conditions:a spherical gap spacing of 20 mm,pulse number of 100,and voltage of 30 kV.The leaching rate of gold was increased by 15.65%via the HVPD pretreatment.The mass fraction of–0.5+0.35 mm and–0.35+0.1 mm was increased by 10.97%and 6.83%compared to the untreated samples,respectively,and the Au grade of–0.1 mm was increased by 22.84%.However,the superiority of the HVPD pretreatment would be weakened by prolonged grinding time.Scanning electron microscopy results indicated that the pretreated products presented as a melting state and then condensation,accompanying by some pore formation.More micro-cracks were generated at the interface of the ore and the original crack were expended via pulsed discharge pretreatment,with the contact area between the leaching reagent and ore increased,the leaching reaction rate enhanced and the leaching effect strengthened.

关 键 词：high-voltage pulse discharge pretreatment Carlin-type gold leaching rate particle size distribution MICRO-CRACKS 

分 类 号：TF831[冶金工程—有色金属冶金]