INVESTIGATION OF THE CONVERSION PROCESS OF CALCIUM CHLORIDE OF SODA PRODUCTION DISTILLER LIQUID IN THE PRESENCE OF MIRABILITE AND THENARDITE
Abstract
The production of soda in the world is accompanied by a large amount of hard-to-recycle liquid waste (distiller liquid) in the form of a solution of CaCl2 and NaCl salts. To solve the problems of the soda industry, some countries of the world approach in different ways, liquid waste is drained into the seas and rivers. In some cases, distiller liquid is partially processed into calcium chloride or liquid road mixtures, building materials, etc. However, the disposal of liquid and solid waste from the soda industry does not always solve environmental problems in this region. In this regard, studies of the conversion of calcium chloride of distiller liquid using sodium sulphate of a mirabilite:thenardite mixture in various ratios have been carried out. It was found that the excess sodium sulphate and its stoichiometry lead to the jointprecipitation of calcium and sodium sulphates. In the process of conversion of calcium chloride with sodium sulphate in the ratio of natural mirabilite:thenardite = 100:0 occurs intensively due to the rapid dissolution of Na2SO4·10H2O. Conversion of calcium chloride at a norm of 0.92-1.0 and a temperature of 50-60°C at various ratios of mirabilite:thenardite shows that in the process of conversion of calcium chloride, the degree of conversion is reached to a maximum of 97% and at an optimum temperature of 50 °C, the stoichiometric norm of sodium sulphate 1.0 and the duration of 60 minutes. A further increase in temperature does not affect the degree of conversion of calcium chloride