METHOD FOR PREPARING SPHERICAL FINE NICKEL METAL POWDER

摘要

PURPOSE: A method for preparing spherical fine nickel metal powder is provided to prepare spherical nickel metal powder an inner part of which is filled with the additives by adding additives capable of reacting with nickel when preparing a precursor spray solution in manufacturing of fine nickel metal powder using spray pyrolysis. CONSTITUTION: The method for preparing spherical fine nickel metal powder comprises a first step of preparing a precursor solution by dissolving one or more of additives selected from a nickel compound selected from nitrate, acetate, chloride, hydrate and sulfate of nickel, 0.01 to 1 mole of ethylenediaminetetraacetic acid based compound on the basis of mole of nickel, 0.01 to 1 mole of ethanolamine based compound and 0.001 to 15 mole of ethylenediamine based compound into distilled water or alcohol; a second step of generating droplets having diameter of 0.1 to 100 μm by injecting the precursor solution into a droplet sprayer; and a third step of drying and pyrolyzing the generated droplets in the reactor temperature range of 600 to 1,500 deg.C, wherein the precursor solution is in the metal concentration range of 0.005 to 2 M, wherein the method further comprises a step of heat treating powder produced when drying and heat treating the generated droplets at an oxidation atmosphere in the third step again at a reduction atmosphere.