PERM TECH TECHNOLOGY WILL HELP RECEIVE RAW MATERIALS FOR THE MEDICAL AND FOOD INDUSTRY FROM POTASSIUM WASTE

7 September 2021 127

—The accumulation of halite waste can lead to salinization of soils, surface and ground waters because there is a large amount of sodium chloride in their composition. But one can obtain soda ash and caustic soda from this substance during its processing. The first is used as a raw material for the production of pharmaceuticals, in the production of glass, cast iron, paints and varnishes, detergents and household products, and with the help of the second one, acidic industrial wastewater can be neutralized, catalysts, paper, batteries, biofuels and other products can be obtained. However, it is difficult to use salt waste without additional enrichment due to the fact that they contain a significant amount of insoluble impurities: clay and calcium sulfate, - says Olga Nisina, the project manager, associate professor of the Chemical Technology and Ecology Department of the Bereznikovskiy Branch of the Perm Tech, PhD in Technical Sciences.

Nowadays, expensive reagents are used to clean salt waste, and the processing takes a quite a long time. To solve this problem, Olga Nisina and Sergey Lanovetskiy Professor of the Chemical Technology and Ecology Department, Doctor of Technical Sciences carried out ultrasonic cleaning of the salt waste suspension from insoluble impurities. Its mechanism is based on acoustic effects, which helps to separate large waste into pieces and destroy the surface of crystals, separating clay and calcium sulfate. For carrying out an experiment the experiments, the scientists used a laboratory unit for ultrasonic processing of halite suspension.

Tests showed that the technology provides 80% of calcium sulfate removal from waste and 35-50% of insoluble residue. At the same time, it does not require the use of expensive reagents, unlike other processing methods, and is quite simple to implement. The technology for processing salt waste has no analogues yet, but such methods are successfully used to clean quartz sands from iron oxides, to enrich gold-bearing ores and remove sludge from the surface of diamonds.

Chemists have created a unique technological scheme for the production of raw materials with a reduced content of calcium sulfate and insoluble residue, which can already be used in production. According to scientists, Russian and foreign enterprises involved in chemical industry can become consumers of the technology.

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