Abstract
This article is devoted to the study of deep processing of synnyrite, a potassium-rich aluminosilicate raw material of the Kalyumnoye deposit of the Synnyr alkalic rock massif (theRepublic of Buryatia, Russia) to produce valuable agricultural (potassium magnesium sulfate) and technical (magnesium aluminate spinel) products. The study demonstrated the promise of this method of processing synnyrite, based on thermochemical activation of the original ore with magnesite instead of limestone, followed by sulfuric acid leaching. This approach significantly reduces the cost of the thermochemical process and provides an additional useful product MgSO4·6H2O, which recuperates the initial magnesium additive and minimizes solid waste generation. This paper also presents a new method of processing alum KAl(SO4)2 obtained from synnyrite, based on sintering with potassium carbonate K2CO3 and brucite Mg(OH)2 (or magnesium oxide) to produce potassium magnesium sulfate K2Mg(SO4)2 and magnesium aluminate spinel MgAl2O4. The samples were characterized by DSC, chemical analysis, and XRD using the Rietveld method in TOPAS 4.2 software.
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