Abstract
One of the pressing issues today is common salt purification from harmful impurities and production of salt for medical and household purposes. To obtain high-purity sodium chloride salt, it is necessary to develop more effective methods for purifying salt from impurities. The article discusses modern methods for purifying Suzak deposit common salt from harmful impurities. The main goal of the scientific work is to study the methods of purifying sodium chloride from impurities. The common salt raw material composition was studied. The content of impurities of Са2+, Мg2+ and SO42- ions and heavy metals Pb (II), Cu (II), Cd (II), As (V) was determined. The solubility in the systems NаСl-Nа2SO4-Нᡃ2O, NaCl-CaCl2-H2O and NаСl-MgCl2-H2O at a temperature of 100-110°C was studied. The effect of temperature and time on the common salt purification degree using active reagents was studied. It was found that the highest common salt purification degree from Са2+, Мg2+ and SO42- at 30 minutes and 90°C, respectively, is 99.8%, 99.9%, 99.93%. It was found that the use of a three-component mixture of Mg(OН)2:СаCО3:CaSO4 in a ratio of 1:4-5:6-7 for 20 minutes during purification allows purifying the NaCl solution from trace impurities of Pb(II), Cu(II), Cd(II), As(V) by 92.0-97.7% and obtaining 99.4% NaCI. To obtain high-purity salt, effective purification methods of salt from impurities are recommended, allowing to achieve a purification level of up to 99%.