Interaction of Salt Melts of Magnesium Production with Atmospheric Air

Abstract

A review of publications on the interaction of salt melts of magnesium production with atmospheric air is presented. The measurement procedure of the weight of interaction products of salt melts with air is described. The results of investigating the emission intensity of hydrogen chloride and chlorine by salt melts of MgCl₂–KCl–NaCl, MgCl₂–NaCl–BaCl₂, and MgCl₂–KCl–NaCl–CaCl₂ systems, as well as the emission intensity of HCl + HBr and Cl₂ + Br₂ gases by salt melts of the MgCl₂–KCl–NaCl–NaBr system, are presented. The thermodynamic analysis of interaction reactions of magnesium salt solutions with atmospheric air is performed. It is revealed that magnesium chloride in the salt melt most intensely interacts with atmospheric air with the emission of chlorine and hydrogen chloride. The specific rates of formation of halogen-containing gases from the unit surface area of the MgCl₂–KCl–NaCl, MgCl₂–KCl–NaCl–BaCl₂, MgCl₂–KCl–NaCl–CaCl₂, and MgCl₂–KCl–NaCl–NaBr systems are measured. The influence of calcium chloride, sodium bromide, and magnesium fluoride on the emission intensity of halogen-containing gases by the surface of salt melts is measured. It is determined that the addition of magnesium fluoride into the composition of chloride melts reduces the emission intensity of chlorine and hydrogen chloride.