METHOD AND APPARATUS FOR PRODUCING METAL POWDER

摘要

A method for producing a metal powder, which comprises a reduction step of contacting a metal chloride gas with a reducing gas to reduce the metal chloride continuously, a cooling step of continuously cooling a gas containing a metal powder formed in the reduction step with an inert gas, wherein in the cooling step, an inert gas is blown from one or more sites of the periphery of the passage for the metal powder to generate a circular flow, and further during the production of the metal powder, an inert gas flow is continuously generated in the vertical direction along the inner wall of production devices (the reduction step, the cooling step); and an apparatus for practicing the method. The method secures the suppression of the coagulation of particles in the metal powder formed and their growth to secondary particles after the reduction step and allows the stable production of a metal powder which has a low content of coarse particles such as coagulated particles and a narrow particle size distribution, and thus can be satisfactorily used for forming an extremely thin layer and a thin multilayer being required in the production of a capacitor in recent years.