Method for producing hematite for iron production

摘要

Provided is a method for producing hematite for iron production, whereby high purity hematite, which can be used as a raw material for producing iron, is cheaply and efficiently recovered from leach residue containing iron oxide produced by the high pressure acid leach (HPAL) process. This method for producing (high purity) hematite for iron production involves a process in which a mineral acid and an oxidizing agent are added to ore containing iron and valuable metals, and the valuable metals are leached at a high temperature and high pressure. Said method includes: (1) a neutralization step in which a neutralizer is added to leachate obtained at a high temperature and high pressure, forming a leach slurry; (2) a solid-liquid separation step in which the leach slurry obtained in the neutralization step (1) is separated into a leach residue and leachate; and (3) a classification step in which the leach residue obtained by solid-liquid separation is classified and separated into hematite and gangue components.