Process for the preparation of silver powder

摘要

A process is disclosed for preparing silver powders with a controlled apparent density wherein an aqueous silver oxide suspension is treated with hydrogen at a temperature between 60 DEG and 115 DEG and under a partial hydrogen pressure of between 5 and 25 atmospheres. The aqueous silver oxide suspension may be additioned with one or more alkali metal, alkaline earth metal, or silver sulphides. Further the aqueous silver oxide suspension may be additioned with one or more silver salts soluble in water or made soluble by complexing with ammonia, such as ammoniacal silver sulphate, silver nitrate or ammoniacal silver nitrate.