Speciation analysis of lead, zinc and selenium in solid impurities of nickel electrolyte
ZHOU Tong1, LU Su-jun1, HU Yue2, LI Yi-jing2, LU Xiao-feng*2, GUO Yong2
1. State Key Laboratory of Nickel and Cobalt Resources Comprehensive Utilization, Jinchuan Group Co., Ltd., Jinchang 737100, China; 2. Key Laboratory of Chemistry of Northwestern Plant Resources, CAS, Lanzhou Institute of Chemical Physics, Lanzhou 730000, China
Abstract：The quality of nickel electrolyte directly influences the quality of electro-nickel products. Besides of soluble impurities in ionized state, the nickel electrolyte also contains insoluble solid particle impurities. The research of property, speciation and source of solid particles is helpful to provide theoretical foundation for improving the quality of nickel electrolyte. The micro elements in solid particles, including lead, zinc and selenium, were selected as the object of study. The speciation structure of solid particles was investigated by the physical characterization methods such as transmission electron microscopy (TEM), Raman spectroscopy, Fourier transform infrared spectroscopy and X-ray powder diffraction. The detailed speciation of these three trace elements was analyzed using Tessier sequential extraction method. The results showed that the solid particles mainly existed in the form of basic salts, carbonate, sulfate or complex salt of nickel, copper, iron and silicon. Lead and zinc mainly existed in the form of carbonate and iron/manganese oxides, while selenium existed in the form of soluble components and iron/manganese oxides. Therefore, the solid particles were mainly from the purification step of nickel electrolyte rather than the back diffusion of anolyte which stayed in the same bath.
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