Bittern containing magnesium compounds, is quite a lot, but up till now it is just wasted. On the other hand, Indonesia udneeds a great deal of magnesia bricks. Therefore, this research was intended to recover magnesium from the bittern in udthe from of magnesium hydroxide in a baffle reactor continuously using counter current flowudThe process was carried out by feeding slaked lime from the top, while bittren and air from the bottom of the reactor. udAfter 20 minutes of operation liguid samples were taken at 10 minutes intervals until steady state condition was udreached. This was indicated by constant values of pH and magnesium concentration. T he process was continued for 10 ud– 20 minutes more to ascertain that steady state condition was really at tained. The magnesium ions in the samples was uddetermined volumetrically. In this research, the variables studied included air flow rate, temperature, e quivalent ratio udof Ca(OH)ud2-MgCl2, and the initial concentration of magnesium chloride in the bittren.udBased on the effects of air flow rate and temperature, the rate of Mg(OH)z formation was controlled by chemical udreaction. Within the range of the variables studied, the reaction rate constant was affected by temperature udexponentially, while air flow rate, Ca(OH)ud2-MgCl2 equivalent ratio, and initial magnesium chlorlde concentrations udshowed logarithmic relations with k. The relative favourable process conditions were found to be air flow rate of 281 udmL/min, temperature of 29 CudoudCa(OH)2-MgCl2 equivalent ratio of 3, initial magnesium chloride concentration of ud0,34mgnol/mL. Under these conditions, the conversion of MgCl2 was 89,17 %.udKeywords: bittern – magnesium hydroxide – kinetics.
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