Wet-mode nickel oxide ore smelting method

摘要

Provided is a wet-mode smelting method for collecting nickel (Ni) from a Ni oxide ore employing a high-pressure acid leaching process, in which the abrasion of a facility by an ore slurry can be prevented, the amount of a final neutralization residue can be reduced, and impurity components can be separated and recovered for recycling purposes. A wet-mode smelting method for collecting nickel from a nickel oxide ore, said method involving at least one step selected from steps (A), (B-1) and (B-2) as mentioned below in a high-pressure acid leaching process: step (A): separating and collecting chromite particles from an ore slurry produced in an ore treatment step by a collection process involving a gravity separation method; step (B-1): subjecting the ore slurry, which has been undergone step (A) to reduce the Cr grade thereof, to a leaching step and a solid/liquid separation step, and then neutralizing a leached solution obtained after the solid/liquid separation step with an Mg-containing alkali such as Mg(OH)