Electrogenerative leaching of nickel sulfide concentrate with ferric chloride

Abstract

In order to utilize the chemical energy in hydrometallurgical process of sulfide minerals reasonably and to simplify the purifying process, the electrogenerative process was applied and a dual cell system was introduced to investigate FeCl₃ leaching of nickel sulfide concentrate. Some factors influencing the electrogenerative leaching, such as electrode structure, temperature and solution concentration were studied. The results show that a certain quantity of electrical energy accompanied with the leached products can be acquired in the electrogenerative leaching process. The output current and power increase with the addition of acetylene black to the electrode. Varying the components of electrode just affects the polarization degree of anode. Increasing FeCl₃ concentration results in a sharp increase in the output of the leaching cell when c(FeCl₃) is less than 0.1 mol/L. The optimum value of NaCl concentration for electrogenerative leaching nickel sulfide concentrate with FeCl₃ is 3.0 mol/L. Temperature influences electrogenerative leaching by affecting anodic and cathodic polarization simultaneously. The apparent activation energy is determined to be 34. 63 kJ/mol in the range of 298 K to 322 K. The leaching rate of Ni²⁺ is 29.3% after FeCl₃ electrogenerative leaching of nickel sulfide concentrate for 620 min with a filter bag electrode.

Keywords

nickel sulfide concentrate / FeCl₃ / electrogenerative leaching

References

[1] LangerS H, YurchakS. Electrochemical reduction of the benzene ring by electrogenerative hydrogenation [J]. J Electrochem Soc, 1969, 116(9): 1228-1229

[2] ZhangHeng-zhong, FangZheng, ZhangPingmin. An investigation on electrogenerative leaching of Ni₃S₂[A]. Proc of ICHM’1992[C], 1992, Beijing, Inter Academic Pub: 286-289

[3] WangShao-fen, FangZheng, ChenYang-guo, et al.. Exploration of electrogenerative leaching of PbS with FeCl₃[J]. The Chinese Journal of Process Engineering, 2002, 2(3): 235-240(in Chinese)

[4] WangShao-fen, FangZheng, WangYun-yan, et al.. Electrogenerative leaching of galena with ferric chloride [J]. Minerals Engineering, 2003, 16(9): 869-872

[5] LiXi-ming, ChenJia-yong, RolandK, et al.. Application of attrition grinding in acid leaching of nickel sulfide concentrate[J]. Transactions of Nonferrous Metals Society of China, 1997, 7(4): 143-147

[6] HuangNai-bao, LiangCheng-hao, TongDawei. Effect of inhibitors on corrosion behavior of copper-nickel in concentrated lithium bromide solution at high temperature[J]. Transactions of Nonferrous Metals Society of China, 2002, 12(3): 424-428

[7] FangZhao-heng. Electrodeposition of amorphous Ni-P alloy coatings[J]. Transactions of Nonferrous Metals Society of China, 1997, 7(3): 148-151

[8] BredenhannR, van VuurenC P J. Leaching behavior of a nickel concentrate in an oxidative sulphuric acid solution [J]. Minerals Engineering, 1999, 12(6): 687-692

[9] MauriceD, HawkJ A. Ferric chloride leaching of a mechanically activated pentlandite-chalcopyrite concentrate[J]. Hydrometallurgy, 1999, 52(3): 289-312

[10] IsabelL, NormaM M, IsraelR, et al.. The use of carbon paste electrodes with non-conducting binder for the study of minerals: chalcopyrite[J]. Hydrometallurgy, 1995, 38(3): 277-287

[11] AhlbergE, AsbjornssonJ. Carbon paste electrodes in mineral processing: an electrochemical study of galena[J]. Hydrometallurgy, 1993, 34(2): 171-185

[12] AhlbergE, AsbjornssonJ. Carbon paste electrodes in mineral processing: an electrochemical study of sphalerite [J]. Hydrometallurgy, 1994, 36(1): 19-37

[13] XuZhi-hong, WanLe-shanThermochemical Data Base for Inorganic Substances[M], 1987, Beijing, Science Press(in Chinese)

[14] JiangHan-yingPhysical Chemistry for Hydrometallurgy[M], 1984, Beijing, Metallurgical Industry Press(in Chinese)

[15] RaoK S, ParamguruR K, DasR P, et al.. The role of galvanic interaction during ammonia leaching of multi mental sulphides[J]. Mineral Processing and Extractive Metallurgy Review, 1992, 11(1): 21-37