METHOD FOR PRODUCTION OF ULTRAFINE COPPER POWDER Russian patent published in 1998 - IPC

FIELD: technology of production of ultrafine powders, in particular, production of copper ultrafine powders. SUBSTANCE: method includes reduction of copper oxide powder produced by plasmochemical method with solution containing stoichiometric quantity of hydrazine hydrate and 0.5-1.0 % vol. of glycerin with copper oxide mass-liquid phase volume ratio of 1:(7-9); cooling of reaction products; separation of copper powder from aqueous solution and powder drying. Aqueous solution from operation of copper powder separation and after respective correction with respect to content of hydrazine hydrate and glycerin is returned to technological cycle in capacity of working solution for reduction of the next portion of copper oxide powder. EFFECT: exclusion from the process of organic solvents difficult-to-mix with water and reduced consumption of expensive hydrazine hydrate. 3 cl, 3 tbl