Preparation of a magnesium hydroxy carbonate from magnesium hydroxide

The preparation of a magnesium hydroxy carbonate from magnesium hydroxide a nd carbon dioxide is described. The procedure involves the formation of a m agnesium hydroxide slurry and sparging CO2 gas through it. Various experime ntal conditions are evaluated in order to obtain the conditions that result in the formation of the magnesium hydroxy carbonate. Slurry pH, slurry tem perature, drying temperature, drying time and HCl addition are the conditio ns that are evaluated. The products that are obtained are identified by XRD and its decomposition characteristics studied with TG/DTA. It is evident f rom the results obtained that the experimental parameters have a significan t influence on the products obtained. (C) 2001 Elsevier Science B.V. All ri ghts reserved.