Integrated Processing Method for Synnyrite with Production of Alumina and Potassium Sulfate

The article presents the research findings obtained in deep integrated processing of rebellious high-potassium aluminum silicates from the Kalyum deposit within the Synnyr alkaline massif— synnyrite—with production of alumina as well as potassium and magnesium sulfates. The introduction of magnesium-bearing mineral—dolomite—as an additive at the stage of thermochemical decomposition of the acid-resistant minerals in the initial raw material (K-feldspar group) provides improved efficiency of the processes due to cheapening of baking, increased marketable production and reduced solid waste. It is found that leaching of activated synnyrite by 60% sulfuric acid promotes deposition of the silicon component as amorphous silica, which facilitates the further processing of pregnant potassium-, magnesium- and aluminium-bearing sulfuric acid solutions with marketable production.