ABSTRACT
Chromite ore predominantly contains the iron chromate spinel but is usually associated with the considerable amount of gangue materials, most commonly magnesium silicates. Chromite commonly occurs in mafic and ultramafic rocks, which cover large portions of the earth’s surface. Hard and lumpy chromite ore is first crushed and ground to desired particles fractions and beneficiated by physical separation for the removal of dust and clayey materials. The fractions of magnesia and chromite ores are mixed to reach the desired composition of the refractory in an edge runner mill or a pug mill with a green binder. Magnesia and chromite are processed separately to get different fractions as required for the desired compaction and then mixed in the desired proportions to obtain the proper composition. The properties of chromite refractories depend on the amount and types of impurities and also on the control of the bursting character during firing.
