Method for producing hematite for ironmaking
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United States of America Patent
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Feb 13, 2018
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app pub date -
Sep 4, 2014
filing date -
Sep 18, 2013
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Abstract
A method of producing (high-purity) hematite for ironmaking includes adding an oxidant and sulfuric acid to nickel oxide ore and then leaching nickel. The method further includes forming a neutralized residue having a sulfur grade exceeding 1.0% by weight by adding a neutralizing agent to leach slurry and being subjected to solid-liquid separation. The neutralizing agent functions to form plaster by reaction with a free sulfuric acid of surplus acid contained in the leach slurry. The leach slurry is a mixture of a leachate and a leach residue obtained after leaching the nickel. The method then includes heating the neutralized residue at a heating temperature of 600° C. or more and 1400° C. or less to form hematite having a sulfur grade of 1.0% or less by weight.
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