INVESTIGATION OF THE PROCESSING OF DISTILLER LIQUID FOR THE PRODUCTION OF SODA ASH

Abstract

The aim of the study is to process the distiller liquid containing calcium chloride, the main waste of soda production, by treating it with natural sodium sulfate to obtain gypsum binder and sodium chloride filtrate. The filtrate after dissolving an additional amount of table salt in it and cleaning it from unwanted impurities can be used in the technology of obtaining soda ash. Sodium sulfate used in the experiments is a natural salt of the Zhaksykylysh deposit, crystallizing in the form of tenardite. A solution of distiller liquid produced by soda ash was obtained from the Sterlitamak soda plant. In order to determine the possibility of an interaction reaction of calcium chloride with sodium sulfate in the presence of impurities, the Gibbs energy was calculated. Based on the chemical composition of the distiller liquid, the required amount of natural sodium sulfate is calculated. The optimal parameters of the distiller liquid processing modes, the consumption of natural sodium sulfate in the range of 84-100% of stoichiometry, temperature and duration of the process were determined.