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    Gold-leaching performance and mechanism of sodium dicyanamide

    Year: 2021

    Journal: Int. J. Miner. Metall. Mater., Volume 28, NOV, page 1759–1768

    Authors: Li, Gen-zhuang; Kou, Jue; Xing, Yi; Hu, Yang; Han, Wei; Liu, Zi-yuan; Sun, Chun-bao

    Organizations: National Naturel Science Foundation of China [51974016, 51204012]

    Keywords: gold leaching; sodium dicyanamide; QCM-D; leaching kinetics; potassium ferrocyanide

    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 center dot cm(-2)center dot min(-1) when the SD concentration was increased from 0 to 0.17 mol/L, and increased from 39.99 to 272.62 ng center dot cm(-2)center dot 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).
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