PROCESS FOR MAKING HIGH DENSITY AND LARGE PARTICLE SIZE COBALT HYDROXIDE OR COBALT MIXED HYDROXIDES AND A PRODUCT MADE BY THIS PROCESS

摘要

The invention relates to a method for preparing a cobaltous hydroxide with ahigh density and a large particle size or an alloy hydroxide of cobalt andsome other metal, in which a complexing agent and hydroxide ion is added to anaqueous cobalt brine or an aqueous brine of cobalt and some other metal underalkaline conditions in order to form a metal hydroxide. In this method, thecomplexing agent is selected so as to form an ammonium complex with the metalion. The molar ratio of complexing agent to metal is about 0.5-3, and the pHis regulated in the range 10-13.