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Results of a preliminary study of the composition and properties of magnesites of provenance from the Goluboe deposit (Krasnoyarskii Krai, Russia) are reported. All magnesites, irrespective of their varietal, structural, and textural features, can be considered as acceptable raw materials. The concentration of impurities and inclusions in a high-quality magnesite does not exceed 1.5%, whereas in low-quality magnesites (2nd grade) they are within 3 – 8% of the total mineral composition. The heat-assisted beneficiation or calcination of raw magnesite yields a material with 98% MgO and a CaO-to-SiO2 ratio greater than 3, which provides means for producing high-quality periclase powders. Tests conducted under industrial conditions show that using technologies of fine grinding, pelletizing, and calcination at 2100°C makes it possible to prepare dense periclase clinker. Calcination of lumpy magnesite at still higher temperatures is not an efficient technique for dense periclase powders. Clinker technology is shown to be the best way towards obtaining periclase and periclase-containing powders using raw magnesite from the Goluboe deposit. |
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