METHOD OF PURIFYING HYDROLYTIC FERRIFEROUS CAKES BY REMOVAL OF NICKEL

摘要

FIELD: nonferrous metallurgy. ^ SUBSTANCE: invention relates to processing nickel-containing intermediate products, namely ferriferous cakes obtained in hydrometallurgical nickel production process. Method comprises repulping of cakes with acid solution containing alkaline metal salts at elevated temperature and maintaining pH of pulp between 1.2 and 1.6. Repulping is effected in reactor provided with mechanical stirring means at specific stirring power in first stage 500-1000 W/m3 and in second stage 5-100 W/m3. ^ EFFECT: enhanced removal of nickel and improved filterability of products. ^ 8 cl, 5 tbl