| 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.
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