PREPARATION METHOD OF SPHERICAL FINE NICKEL POWDER, WITH HIGH TAP DENSITY, BY WET REDUCTION PROCESS

摘要

PURPOSE: To provide a preparation method of spherical fine nickel powder that is suitably used as a material for inner electrode of multilayer ceramic condenser. CONSTITUTION: In a method for preparing nickel powder using water system only as solvent, the method comprises first step of preparing a nickel salt aqueous solution by adding one nickel salt selected from nickel salts to a mixed solvent prepared by adding one organic solvent selected from various alcohols including ethanol, 2-phenyl ethanol, 1-propanol, 2-propanol, butanol, 1-ethandiol, 2-ethandiol, 1-propantriol, 2-propantriol and 3-propantriol to the water system; second step of obtaining a reaction slurry by adding sodium hydroxide (NaOH) to the prepared nickel salt aqueous solution; third step of adding carboxymethyl cellulose as a dispersing agent to the reaction slurry to control particle diameter and relieve cohesion of the reaction slurry; fourth step of preparing fine nickel powder by reducing the dispersing agent added reaction slurry under specific reaction temperature and reaction time conditions using hydrazine hydrate (N2H4H2O) as a reducing agent; and fifth step of removing impurities and drying the nickel powder after repeatedly washing the nickel powder using distilled water by recovering the prepared nickel powder.