PRODUCTION OF HIGH-PURITY BASIC NICKEL CARBONATE

摘要

PURPOSE:To obtain efficiently a titled compd. with a simple operation by adding an alkali hydroxide to the product obtd. by bringing an aq. alkali carbonate soln. and aq. NiSO4 soln. into reaction under specific conditions then filtering the precipitate and subjecting such precipitate to repulp cleaning. CONSTITUTION:The aq. NiSO4 soln. and the aq. alkali carbonate soln. having 8.0-9.0pH are added so as to blow simultaneously said solns. to an aq. soln. which is prepd. by adding an alkali carbonate to water to maintain the same at the same 8.0-9.0pH, holding the soln. at >=40 deg.C and keep stirring the soln. then the soln. is subjected to suction filtration in such a manner that the moisture sticking to the formed precipitate attains <=60wt%. The alkali hydroxide of <=1mol concn. is then added to the precipitate at a ratio of <=1mol with 1mol Ni in the precipitate so as to attain <=200g/l slurry concn. The slurry is then kept at >=40 deg.C and is stirred for about 30min and thereafter the slurry is subjected to the suction filtration so that the moisture sticking to the precipitate attains 60wt%. Such precipitate is subjected to plural times of the repulp cleaning by water then to the final suction filtration so as to attain 60wt% the moisture sticking to the precipitate. The titled compd. is thus obtd.