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Gold-leaching performance and mechanism of sodium dicyanamide
International Journal of Minerals, Metallurgy and Materials ( IF 4.8 ) Pub Date : 2021-04-07 , DOI: 10.1007/s12613-020-2153-6
Gen-zhuang Li , Jue Kou , Yi Xing , Yang Hu , Wei Han , Zi-yuan Liu , Chun-bao Sun

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).



中文翻译:

双氰胺钠的浸金性能及机理

在这项工作中,将双氰胺钠(SD)用作金回收的浸出剂,并研究了SD用量和溶液pH值对金浸出性能的影响。当将SD用作15 kg / t的唯一浸出试剂时,金的回收率为34.8%。在SD溶液中存在一定量的亚铁氰化钾(PF)时,发现金的回收率从34.8%增加到57.08%。利用带耗散的石英晶体微天平(QCM-D)技术,研究了有无PF的SD的浸出动力学。QCM-D结果表明,当SD浓度从0增加到0.17 mol / L时,金的浸出率从4.03增加到39.99 ng·cm -2 ·min -1,从39.99增加到272.62 ng·cm当将0.1 mol / L PF与SD结合使用时,-2 ·min -1。X射线光电子能谱和电喷雾质谱法对浸出试验中的母液进行了表征,结果表明SD溶液中的Au和(N(CN)2-形成了一系列金属络合物离子[AuNa x(N (CN)2x +2 ] -x = 1、2、3或4)。

更新日期:2021-04-08
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