Separation and Recovery of Gold, Copper and Silver from Waste Acid Residues by Novel Alkaline Dechlorization-Acid Leaching Process

Yang Wang; Keneng Zhang; Yonggui Chen

doi:10.14233/ajchem.2015.17880

Issue

Vol. 27 No. 1 (2015): Vol 27 Issue 1

Issue Published : December 27, 2014

This work is licensed under a Creative Commons Attribution 4.0 International License.

Separation and Recovery of Gold, Copper and Silver from Waste Acid Residues by Novel Alkaline Dechlorization-Acid Leaching Process

https://doi.org/10.14233/ajchem.2015.17880

Yang Wang

Key Laboratory of Metallogenic Prediction of Nonferrous Metals, Ministry of Education, School of Geosciences and Info-Physics, Central South University, Changsha 410083, P.R. China

Keneng Zhang

Key Laboratory of Metallogenic Prediction of Nonferrous Metals, Ministry of Education, School of Geosciences and Info-Physics, Central South University, Changsha 410083, P.R. China

Yonggui Chen

Key Lab Geotech & Underground Engineering, Ministry of Education, Tongji University, Shanghai 200092, P.R. China

Corresponding Author(s) : Keneng Zhang

infernovawy@gmail.com

Asian Journal of Chemistry, Vol. 27 No. 1 (2015): Vol 27 Issue 1
Article Published : December 29, 2014

Abstract

A new process involving alkaline dechlorination and acidic leaching is developed for separation and recovery of valuable metals (such as copper, gold and silver) from waste acid residues containing 20.5 % sulfur and 3.198 % chlorine. It is shown that under the conditions of the liquid/solid ratio of 6:1 mL/g, leaching time of 1.5 h, pH 7-14, alkaline washing can effectively remove copper chloride from waste acid residues, favoring the subsequent operations for leaching and recovery of metals. The leaching rate of copper reaches 91.54 % and more than 99.8 % of gold and silver are enriched in the slag for further recovery when the alkaline washed waste acid residues are subjected to the following leaching conditions: L/S ratio of 6:1 mL/g, concentration of the mixed acid consisting of reagent A of 1.24 mol/L and reagent B of 0.3 mol/L, temperature of 85 °C and leaching time of 1.5 h. The process is thus very promising for efficient separation and high recovery of copper, gold and silver from waste acid residues.

Keywords

Waste acid residues Mixed acid leaching Dechlorination by alkaline washing Copper Gold Recovery

Wang, Y., Zhang, K., & Chen, Y. (2014). Separation and Recovery of Gold, Copper and Silver from Waste Acid Residues by Novel Alkaline Dechlorization-Acid Leaching Process. Asian Journal of Chemistry, 27(1), 292–296. https://doi.org/10.14233/ajchem.2015.17880

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References

E. Mylona, A. Xenidis and I. Paspaliaris, Miner. Eng., 13, 1161 (2000); doi:10.1016/S0892-6875(00)00099-6.

D. Kalderis, E. Tsolaki, C. Antoniou and E. Diamadopoulos, Desalination, 230, 162 (2008); doi:10.1016/j.desal.2007.11.023.

Ch. Wolkersdorfer, Water Management at Abandoned Flooded Underground Mines, Fundamentals, Tracer Tests, Modelling, Water Treatment, Springer, p. 465 (2008).

A. Luptakova, S. Ubaldini, E. Macingova, P. Fornari and V. Giuliano, Process Biochem., 47, 1633 (2012); doi:10.1016/j.procbio.2012.02.025.

T.A. Kurniawan, G.Y.S. Chan, W.H. Loa and S. Babel, Chemical Eng. J., 118, 83 (2006); doi:10.1016/j.cej.2006.01.015.

S. Santos, R. Machado, M. Joana Neiva Correia and J.R. Carvalho, Miner. Eng., 17, 225 (2004); doi:10.1016/j.mineng.2003.09.015.

B. Nasernejad, T. Kaghazchi, M. Edrisi and M. Sohrabi, Process Biochem., 35, 437 (1999); doi:10.1016/S0032-9592(99)00067-9.

Y. Wang, K.N. Zhang, Y.G. Chen, X.Z. Zhou and F.X. Jin, J Cent. South Univ., 20, 3193 (2013); doi:10.1007/s11771-013-1844-9.

L.P. Wang, J. Ponou, S. Matsuo, K. Okaya, G. Dodbiba, T. Nazuka and T. Fujita, Miner. Eng., 45, 100 (2013); doi:10.1016/j.mineng.2013.02.011.

Y.J. Zhang, B. Wang and J.Y. Shi, J. Central South Univ. (Sci Technol. Ed.), 3, 865 (2010).

R.J. Ma, Principle on Hydrometallurgy, Metallurical Industry Press, Beijing, pp. 340-341.

H.G. Li, Metallurgical Principle, Science Press, Beijing. pp. 151-186, (2007).

Z.M. Sun, Y.J. Zheng and T. Nonferr, Metal Soc., 21, 665 (2011).

Y. Wang, S.X. Li, X.D. Zhu and Z.Q. Yu, Chinese J. Nonferrous Metals, 23, 247 (2013).

T. Deng and Z. Wen, Nonferrous Metals, 52, 54 (2000).

C. Klauber, Int. J. Miner. Process., 86, 1 (2008); doi:10.1016/j.minpro.2007.09.003.

Issue

Vol. 27 No. 1 (2015): Vol 27 Issue 1

Separation and Recovery of Gold, Copper and Silver from Waste Acid Residues by Novel Alkaline Dechlorization-Acid Leaching Process

Corresponding Author(s) : Keneng Zhang

Abstract

Keywords

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