Study on Preparation Technology of Nickel Powder with Liquid Phase Reduction Method

Ultrafine nickel powder was prepared without dispersant by liquid phase reduction method. The hydrazine hydrate was used as the reductant, the nickel sulfate as the raw material and NaOH was the pH regulator. The influences of the reaction temperature, pH, concentration of Ni2+ ions, mole ratio of N2H4·H2O/Ni2+ on the particle size, the morphology and the dispersion of nickel powder were studied. The samples were characterized by the scanning electron microscope (SEM), X-ray diffraction (XRD), laser particle size analysis etc. The results show that the high purity and spherical nickel powder with face-centered cubic structure can be prepared when the temperature is 80 C, pH is 11, the concentration of Ni2+ ions is 0.5 mol/L, the mole ratio of N2H4·H2O/Ni2+is 4. The average particle size of nickel powder is about 400 nm.