PRODUCTION OF METALLIC COPPER FINE POWDER

PURPOSE:To obtain metallic copper fine powder having a controlled particle shape or particle size by adding either inexpensive cuprous oxide particles for a ship bottom paint or an acid while expending more than a fixed time so as to obtain the strong acidity less than a prescribed pH value of the resultant slurry and by allowing to react both with each other. CONSTITUTION:Cuprous oxide particles for a ship bottom paint which are inexpensive, chemically stable and readily available in large quantities and an acid such as nitric acid, phosphoric acid, acetic acid, etc. particularly sulfuric acid are mixed and the homogenizing of above-mentioned cuprous oxide particle slurry and the acid is promoted by stirring, etc. In this case, it is necessary that the quantity of acid to be added or mixed is added while expanding >=15min so as to obtain