Preparation of Magnesium Carbonate Whisker by Using Magnesite Tailings

摘要

Magnesium carbonate whisker was prepared by thermal decomposition of Mg(HCO_3)_2 solution that was prepared through hydration and carbonation of light burnt magnesia derived from magnesite tailings. The effects of thermal decomposition conditions on the morphology of magnesium carbonate crystal were investigated. Magnesium carbonate whiskers were successfully prepared when a kind of soluble magnesium salt was added, and magnesium carbonate whiskers with the length of 20 to 60μm and aspect ratio of 10～20 were obtained under the condition of 50 °C thermal decomposition temperature and 200 rpm stirring intensity.