Production method for hematite for iron production

Abstract

Provided is a production method for refining iron oxide (hematite), which has such a low sulfur content as to be used as a raw material for ironmaking from a leach residue containing iron oxide, the leach residue being produced by a high pressure acid leach (HPAL) process and being a raw material that can be cheaply and stably procured. In the method of producing (high purity) hematite for ironmaking by a process of adding an oxidant and sulfuric acid to nickel oxide ore and then leaching nickel, a leach residue obtained after the leaching of nickel is heated to 600° C. or more, and preferably 800° C. or more and 1400° C. or less.

1 . A method of producing high purity hematite for ironmaking comprising:
 adding an oxidant and sulfuric acid to nickel oxide ore   leaching nickel after adding the oxidant and sulfuric acid to the nickel oxide ore; and   heating a leach residue obtained after the leaching of nickel to 600° C. or more.   
     
     
         2 . A method of producing high purity hematite for ironmaking comprising:
 adding an oxidant and sulfuric acid to nickel oxide ore;   leaching nickel after adding the oxidant and sulfuric acid to the nickel oxide ore; and   heating a leach residue obtained after the leaching of nickel to 800° C. or more and 1400° C. or less.