PROCESS FOR PRODUCING HEMATITE FOR IRONMAKING

摘要

Proposed are a process for separating a leach residue from which a hematite-containing material capable of being used as a raw material for ironmaking can be obtained and a process for producing hematite for ironmaking from the leach residue. The process utilizes, as a raw material, a leach residue that is obtained from a hydrometallurgical refining plant where a nickel oxide ore is treated by a high pressure acid leach process, and includes at least the following three steps in sequence: a separation step of the leach residue into an overflow and an underflow using a wet cyclone under a condition that the wet cyclone is adjusted to have a setting between 1 µm or less and 2 µm or less as a classification particle size for the overflow; a physical separation step of the overflow into a strong magnetic substance and a weak magnetic substance using a strong-magnetic-field magnetic separator under a condition that magnetic field intensity is 5 to 20 [kGauss]; and a dehydration step of a superheated steam drying system of adjusting a moisture content of the strong magnetic substance after the separation, to be 10 wt% to 17 wt%. (193 words)