Method for processing of concentration of nickel ore saprolita

摘要

The method for nickel concentration processing, which is low cost, simple and convenient, as well as having low environmental load, which is capable of enhancing nickel content of a saprolite ore with low nickel content, which was not conventionally used effectively as a raw material of ferronickel smelting due to having low nickel content, to a level to be utilized economically as a raw material of ferronickel smelting. The method is characterized by including the steps of the following (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 is subjected to dry-type grinding processing of the surface layer part by attrition. (3) a ground ore 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 the classification point is recovered as a nickel concentrate. (4) an ore portion having a particle size over the classification point is subjected to dry-type 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.