Untersuchung des einflusses der analysenbedingungen auf die zersetzung von 4MgCO 3 ·Mg(OH) 2 · 4H 2O und die bildung von magnesit MgCO 3

Abstract

The processes, which influence the decomposition of 4MgCO 3 ·-Mg(OH) 2 · 4H 2O, could be determined by systematical variation of the analytical parameters. The original crystal structure exists in a wide temperature range during the decomposition. The formation of magnesite is a secondary reaction of the gaseous phase with the reaction product. H 2O and CO 2, are released simultaneously in different proportions during the decomposition to 500°C. Stoichiometric intermediates were not found. The original crystal structure collapsed, when the last H 2O escapes. The ratio of MgCO 3: MgO can be influenced by partial pressure of CO 2 in a wide range.