Preparation of high purity nickel powder by electrodeposition
High purity nickel powder was prepared by electrodeposition method,and the particle size,chemical composition,microstructure,and crystal structure of the product nickel powder were characterized by Zeta potential analyzer,inductively coupled plasma emission spectrometer,scanning electron microscope,and X-ray diffraction analysis,respectively.The effects of process parameters such as current density,nickel ion mass concentration,electrolyte pH value,NH4C1 concentration,electrolysis temperature,and powder extraction time on the particle size,current efficiency,and microstructure of electrodeposited nickel powder.The results showed that the process parameters such as current density,nickel ion concentration,electrolyte pH value,NH4Cl concentration,electrolysis temperature,and powder extraction time all had significant effects on the particle size distribution and morphology of electrodeposited nickel powder.The optimal process parameters for electrode plate spacing of 30 mm were:a current density of 3 000 A/m2,a nickel ion(Ni2+)concentration of 5 g/L,a pH value of 5,a temperature of 40 ℃,an ammonium chloride(NH4 Cl)concentration of 10 g/L,and a powder collection time interval of 120 s,the nickel powder obtained had a uniform particle size distribution,a dendritic microstructure,and a purity of 99.87％.A nickel sulfate solution containing impurity ions Fe3+and Cu2+was prepared artificially to simulate the composition of industrial production electrolytes,was used as the electrolyte for electrodeposition experiments.High purity nickel powder with a purity of 99.84％,uniform particle size distribution,and dendritic microstructure was obtained.The research results can provide reference for the preparation of high-purity nickel powder by industrial nickel electroplating.
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