Pembuatan Magnesium Karbonat Berukuran Ultra Halus Bagian 1. Perilaku Kalsinasi Dolomit Indonesia[SYNTHESIS OF ULTRA FINE GRAIN MAGNESIUM CARBONATE PART 1. CALCINATION BEHAVIOUR OF INDONESIAN DOLOMITE]

Abstract

Dolomite deposits can be found in many places in Indonesia. The larger deposit is located in East Java provence. Dolomite is mainly and recently used only as fertilizer, but it can be processed to obtain ultra fine grain magnesium carbonate that can be used as raw materials for drugs and fillers in pharmacy and coating industry. Dolomite contains 26,4% magnesium oxide and 63,42% calcium oxide. The calcination is the first important step in obtaining magnesium oxide or magnesium carbonate from dolomite. In this recent research, dolomite from Madura has been calcined by using a muffle furnace. The decomposition reaction temperature has detected to take place at temperature range 730-890 oC. The most important variable in dolomite calcination are temperature and time. At 600-700 oC, the decomposition rate is very slow and the result is very poor. But at 800 oC, although the decomposition rate is still slow but the result is maximum. At 900 oC and beyond, the decomposition rate is very high and the result is maximum. The result is magnesium and calcium oxide that is not bound chemically.