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Indonesia has a lot of dolomite reserves. Magnesium carbonate can be synthesized from dolomite. One of the main steps that requires a lot of energy are magnesium bicarbonate thermal decomposition. Magnesium bicarbonate solution are heated to make magnesium carbonate as precipitate. One of the ways to improve this process are by using ultrasonic waves as energy carrier. The purpose of this study is to find the effect of ultrasonic waves heating (sonochemistry) to thermal decomposition of magnesium bicarbonate. In this work, the author conducted ultrasonic heating with the amplitude of the waves varied around 20 µm and 30 µm for 35 minutes. Conventional heating using heat plate was also conducted and compared with ultrasonic heating. Higher decomposition ratio was reached on samples heated using ultrasonic waves with the value of 85.70% compared to conventional heating with decomposition ratio of only 50.08%. Amplitude effect on decomposition ratio were also observed. Higher amplitude made decomposition rate faster.

Precipitation Rate Investigation on Precipitated Magnesium Carbonate by Ultrasonic of Magnesium Bicarbonate