Patent ID: 8028939

Claim:
A method for nickel concentration processing of a saprolite ore, characterized by comprising the following steps (1) to (4): (1) a saprolite ore is subjected to crushing processing to adjust the ore particle size to a size passing a sieve with an mesh opening of 50 mm; (2) a crushed ore obtained in the step of the above (1) is subjected to dry-type grinding processing of the surface layer part by attrition; (3) a ground ore obtained in the step of the above (2) is subjected to dry-type classification processing at a classification point to be selected from 0.5 to 2.0 mm, and then an ore portion having a particle size of equal to or smaller than said classification point is recovered as a nickel concentrate; and (4) an ore portion having a particle size over the classification point, obtained in the step of the above (3), is subjected to dry-type specific gravity separation processing, and then an ore portion having a specific gravity of equal to or smaller than 2.0, is recovered as a nickel concentrate.