Gold-leaching performance and mechanism of sodium dicyanamide

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

doi:10.1007/s12613-020-2153-6

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Gen-zhuang Li, Jue Kou, Yi Xing, Yang Hu, Wei Han, Zi-yuan Liu, and Chun-bao Sun, Gold-leaching performance and mechanism of sodium dicyanamide, Int. J. Miner. Metall. Mater.,(2021). https://doi.org/10.1007/s12613-020-2153-6

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Gen-zhuang Li, Jue Kou, Yi Xing, Yang Hu, Wei Han, Zi-yuan Liu, and Chun-bao Sun, Gold-leaching performance and mechanism of sodium dicyanamide, Int. J. Miner. Metall. Mater.,(2021). https://doi.org/10.1007/s12613-020-2153-6

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Research Article

Gold-leaching performance and mechanism of sodium dicyanamide

+ Author Affiliations

Corresponding authors:
Jue Kou E-mail: koujue@ustb.edu.cn

Yi Xing E-mail: xingyi@ustb.edu.cn
Received: 15 March 2020; Revised: 22 July 2020; Accepted: 23 July 2020; Available online: 26 July 2020

Abstract

Abstract

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, [AuNa_x(N(CN)₂)_x₊₂]^– (x = 1, 2, 3, or 4).
- gold leaching,
- sodium dicyanamide,
- QCM-D,
- leaching kinetics,
- potassium ferrocyanide

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References(22)

References

[1]	C.B. Sun, X.L. Zhang, J. Kou, and Y. Xing, A review of gold extraction using noncyanide lixiviants: Fundamentals, advancements, and challenges toward alkaline sulfur-containing leaching agents, Int. J. Miner. Metall. Mater., 27(2020), No. 4, p. 417. doi: 10.1007/s12613-019-1955-x
[2]	H. Qin, X.Y. Guo, Q.H. Tian, and L. Zhang, Recovery gold from refractory gold ore: Effect of pyrite on the stability of the thiourea leaching system, Int. J. Miner. Metall. Mater., https://doi.org/10.1007/s12613-020–2142-9.
[3]	H.F. Zhao, H.Y. Yang, L.L. Tong, Q. Zhang, and Y. Kong, Biooxidation-thiosulfate leaching of refractory gold concentrate, Int. J. Miner. Metall. Mater., 27(2020), No. 8, p. 1075. doi: 10.1007/s12613-020-1964-9
[4]	D. Britton, Silver dicyanamide, AgN(CN)₂-orthorhombic modification, Acta Crystallogr., Sect. C, 46(1990), No. 12, p. 2297. doi: 10.1107/S0108270190005479
[5]	P.M. Van Der Werff, S.R. Batten, P. Jensen, B. Moubaraki, and K.S. Murray, Cation templation of anionic metal dicyanamide networks, Inorg. Chem., 40(2001), No. 7, p. 1718. doi: 10.1021/ic000978x
[6]	M. Kurmoo and C.J. Kepert, Hard magnets based on transition metal complexes with the dicyanamide anion, {N(CN)₂}^–, New J. Chem., 22(1998), No. 12, p. 1515. doi: 10.1039/a803165g
[7]	L.Y. Zhang, L.X. Shi, and Z.N. Chen, Syntheses, structures, and electronic interactions of dicyanamide/tricyanomethanide-bridged binuclear organometallic complexes, Inorg. Chem., 42(2003), No. 2, p. 633. doi: 10.1021/ic025879t
[8]	J. Kohout, L.Jäger, M. Hvastijová, and J. Kožíšek, Tricyanomethanide and dicyanamide complexes of Cu(II), Ni(II), Co(II), their structures and properties, J. Coord. Chem., 51(2000), No. 2, p. 169. doi: 10.1080/00958970008055127
[9]	S.R. Batten and K.S. Murray, Structure and magnetism of coordination polymers containing dicyanamide and tricyanomethanide, Coord. Chem. Rev., 246(2003), No. 1–2, p. 103. doi: 10.1016/S0010-8545(03)00119-X
[10]	D. Britton and Y.M. Chow, The crystal structure of silver dicyanamide, AgN(CN)₂, Acta Crystallogr., Sect. B, 33(1977), No. 3, p. 697. doi: 10.1107/S056774087700449X
[11]	M.I. Jeffrey, J. Zheng, and I.M. Ritchie, The development of a rotating electrochemical quartz crystal microbalance for the study of leaching and deposition of metals, Meas. Sci. Technol., 11(2000), No. 5, p. 560. doi: 10.1088/0957-0233/11/5/317
[12]	I.C. Chen and M. Akbulut, Nanoscale dynamics of heavy oil recovery using surfactant floods, Energy Fuels, 26(2012), No. 12, p. 7176. doi: 10.1021/ef301241f
[13]	J. Kou and S.H. Xu, In situ kinetics and conformation studies of dodecylamine adsorption onto zinc sulfide using a quartz crystal microbalance with dissipation (QCM-D), Colloids Surf. A, 490(2016), p. 110. doi: 10.1016/j.colsurfa.2015.11.042
[14]	C. Gutig, B.P. Grady, and A. Striolo, Experimental studies on the adsorption of two surfactants on solid−aqueous interfaces: adsorption isotherms and kinetics, Langmuir, 24(2008), No. 23, art. No. 13814. doi: 10.1021/la8032034
[15]	P. Josefsson, G. Henriksson, and L. Wågberg, The physical action of cellulases revealed by a quartz crystal microbalance study using ultrathin cellulose films and pure cellulases, Biomacromolecules, 9(2008), No. 1, p. 249. doi: 10.1021/bm700980b
[16]	M. Rodahl and M. Jonson, Viscoelastic acoustic response of layered polymer films at fluid-solid interfaces: Continuum mechanics approach, Phys. Scripta, 59(1999), No. 5, p. 391. doi: 10.1238/Physica.Regular.059a00391
[17]	Y.X. Da, Y.Q. Liu, and X.C. Zhu, XPS study on polytetramethylene porphyrin and its metal complexes, Acta Chim. Sinica, 43(1985), No. 1, p. 44.
[18]	S.H. Xu, J. Kou, T.C. Sun, and K. Jong, A study of adsorption mechanism of dodecylamine on sphalerite, Colloids Surf. A, 486(2015), p. 145. doi: 10.1016/j.colsurfa.2015.09.040
[19]	Z.S. Hua, G.C. Yao, J. Ma, Z.G. Zhang, and L.S. Liang, XPS analysis of nickel layers on carbon fiber, Chin. J. Nonferrous Met., 21(2011), No. 1, p. 165. doi: 10.3724/SP.J.1146.2010.00276
[20]	D. Kowalczyk, S. Slomkowski, M.M. Mohamed, and M. Delamar, Adsorption of aminopropyltriethoxy silane on quartz: an XPS and contact angle measurements study, Int. J. Adhes. Adhes., 16(1996), No. 4, p. 227. doi: 10.1016/0143-7496(95)00052-6
[21]	Z.C. Wang, Y.Z. Zhang, S.M. Zhou, and C.J. Lin, Corrosion compositions of carbon steel under ion-selective coatings by XPS, J. Chin. Soc. Corros. Prot., 21(2001), No. 5, p. 273.
[22]	R. Pietrzak, T. Grzybek, and H. Wachowska, XPS study of pyrite-free coals subjected to different oxidizing agents, Fuel, 86(2007), No. 16, p. 2616. doi: 10.1016/j.fuel.2007.02.025