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Anhydrous borax production by microwave heating

1996    Kocakusak, S; Koroglu, HJ; Ekinci, E; Tolun, R

The dehydration of borax pentahydrate to produce anhydrous borax by a new process technique, microwave heating, has been investigated. This technique solved the difficulties of adhesion, or melting, during borax dehydration. This process is a fast dehydration process in which continuous production of anhydrous borax is possible. In conventional anhydrous borax production technologies, the a dehydration of borax is carried out at a temperature range of 450-750 degrees C. The resultant borax in glassy form, is cooled, crushed and sieved. There are many technological problems associated with this technology. High purity borax up to 97.5% Na2B4O7 was produced by microwave heating. The sample size was 20 grams. The dehydration was done in four stages at respective temperatures of 20 degrees C, 180 degrees C, 200 degrees C and 250 degrees C. For the purposes of future continuous applications, a teflon belt was used, as supporting plate.