PRODUCTION OF NICKEL FINE POWDER

PURPOSE:To obtain nickel fine powder having good diffusivity, small particle diameters and extremely narrow particle size distribution range by using basic nickel carbonate as a raw material in a method for reacting nickel containing solution with hydrazine, etc. CONSTITUTION:Dispersion liquid which basic nickel carbonate is dispersed in solvent, such as water to form is heated to the prescribed temp. and kept at at that temp. and hydrazine hydrate (or hydrazine) is added to it while stirring. Then, nickel complex is formed by solid-liquid reaction between basic nickel carbonate and hydrazine hydrate and nickel ions are deposited as metallic nickel by the reducing action of hydrazine hydrate. The basic nickel carbonate is produced by making water solution of soluble nickel (II) salt, such as nickel chloride interact with alkali carbonate. The product arbitrary composition represented by the general formula, whose NiCO3.yNi(OH)2.H2O, can be usually used, but that of