INFLUENCE OF INTENSITY OF ULTRASONIC ACTION ON DEGREE OF PURIFICATION OF HALITE WASTE FROM CALCIUM SULPHATE IMPURITY

When enriching potassium-magnesium ores, millions of tons of solid halite waste are formed, occupying vast areas and posing a danger to the environment. The main useful component of both these wastes is sodium chloride, which serves as a raw material in many chemical industries. The most common processing lines are the production of technical sodium chloride and technical sodium chloride solution. These products are intermediate and can be used in further chemical processes. Obtaining these products of the required quality is hindered by the presence of impurities, such as CaSO4, MgCl2, insoluble residues. The most undesirable impurity is calcium sulphate, the concentration of which can reach 3%. According to the literature sources, the optimal intensity of ultrasonic treatment of the water-dispersed medium was determined. The results of analyzes of phase and granulometric composition of solid halite waste (quarry salt and halite dump) are presented. The character of distribution of calcium sulfate impurity in crystals of halite waste is revealed. The article examines the results of the study of the influence of the intensity of ultrasonic treatment on the residual content of calcium sulphate in halite waste. Based on the results of the studies, the duration and intensity of the ultrasonic effect were established, at which the minimum concentration of calcium sulfate in the resulting halite raw material is reached. The obtained results allowed to establish the optimal regime of the process of cleaning the halite raw materials (intensity of ultrasonic action, processing time), which allow to significantly reduce the content of calcium sulphate during the mechanical cleaning stage and confirmed the potential possibility of using the obtained results for improving the technology of sodium chloride technical solution production, solid halite waste produced by potassium chloride "Uralkali".