Gold-leaching performance and mechanism of sodium dicyanamide  

作　　者：Gen-zhuang Li Jue Kou Yi Xing Yang Hu Wei Han Zi-yuan Liu Chun-bao Sun 

机构地区：[1]University of Science and Technology Beijing,School of Civil and Resource Engineering,Beijing 100083,China [2]University of Science and Technology Beijing,School of Energy and Environmental Engineering,Beijing 100083,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2021年第11期1759-1768,共10页矿物冶金与材料学报（英文版）

基　　金：the National Naturel Science Foundation of China(Nos.51974016 and 51204012)for financial support.

摘　　要：In this work,sodium dicyanamide(SD)was used as a leaching reagent for gold recovery,and the effects of the SD dosage and solution pH on the gold-leaching performance were investigated.A gold recovery of 34.8%was obtained when SD was used as the sole leaching reagent at a dosage of 15 kg/t.In the presence of a certain amount of potassium ferrocyanide(PF)in the SD solution,the gold recovery was found to increase from 34.8%to 57.08%.Using the quartz crystal microbalance with dissipation(QCM-D)technique,the leaching kinetics of SD with and without PF were studied.The QCM-D results indicate that the gold-leaching rate increased from 4.03 to 39.99 ng·cm^(–2)·min^(–1) when the SD concentration was increased from 0 to 0.17 mol/L,and increased from 39.99 to 272.62 ng·cm^(–2)·min^(–1) when 0.1 mol/L of PF was used in combination with SD.The pregnant solution in the leaching tests was characterized by X-ray photoelectron spectroscopy and electrospray mass spectrometry,which indicated that Au and(N(CN)2)–in the SD solution formed a series of metal complex ions,[AuNax(N(CN)2)x+2]–(x=1,2,3,or 4).

关 键 词：gold leaching sodium dicyanamide QCM-D leaching kinetics potassium ferrocyanide 

分 类 号：TF831[冶金工程—有色金属冶金]