METHODS FOR PREPARING HEMATITE

摘要

There is provided a method for preparing hematite. The method comprises obtaining hematite from a basic aqueous composition comprising at least one precipitated iron ion, having a pH of about 10.5 to about 13 and being at temperature of about 50 °C to about 150 °C, by reacting the composition with hematite, thereby promoting, catalyzing and/or enhancing formation of the hematite. For example, the basic aqueous composition is obtained by leaching an iron-containing material so as to obtain a leachate and a solid residue; separating the leachate from the solid residue; and reacting the leachate with a base. It can alternatively be obtained by leaching the iron- containing material so as to obtain a leachate and a solid residue; optionally removing the at least a portion of the at least one iron ion from the leachate; separating the leachate from the solid residue; and reacting the leachate with a base.