Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 31    No. 7    July 2021

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Influence of high concentration Zn2+ on floatability of sphalerite in acidic system
Ting-sheng QIU1, Guo-dong LI1,2, Xiao-bo LI1, Hua-shan YAN1, Chen LIU1

1. School of Resource and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China;
2. Northwest Research Institute of Mining and Metallurgy, Baiyin 730900, China

Abstract:The influence of high concentration Zn2+ on the floatability of sphalerite in an acidic system was investigated via flotation experiments, zeta potential measurements, contact angle measurements, and X-ray photoelectron spectroscopy. The results indicated that Zn2+ was adsorbed on the sphalerite surface and a Zn-hydroxyl complex was formed at a pH of 4 and a Zn2+ concentration of 4×10-2 mol/L. The zeta potential increased and the contact angle decreased from 84.80° to 36.48°, strongly inhibiting the floatability of sphalerite. When S2- or Cu2+ activator was used alone, sphalerite was not activated after Zn2+ was adsorbed, and its contact angle did not change significantly. However, by using a combination of S2- and Cu2+ activators, its floatability was realized after Zn2+ adsorption. This result was attributed to the removal of the Zn-hydroxyl complex on the surface of sphalerite by S2-. After this removal, Cu2+ was adsorbed on the sphalerite surface to form a Cu2S?S0 hydrophobic film.


Key words: acidic system; high concentration Zn2+; sphalerite; flotation

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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