Roll pressing of sodium perborate monohydrate

Abstract

Sodium perborare monohydrate (SPM) is produced by calcining 3 moles of water of sodium perborate tetrahydrate with fluidized bed dryer. In fluidized bed dryer, the powders of the sodium perborate monohydrate are sucked by air fan and collected with the bag filter. Prior to feeding to the process, these powders are dissolved and their peroxide content are decreased to 0, 5%. However; dissolving the powder of SPM is difficult and decreasing the peroxide content is not efficient. Therefore the utilisation of these powders are considered and roll pressing are used for this purpose. SPM powders are roll pressed with an high yield without using any binder or humidification process. The total powder content are decreased by about 70%. The bulk density is increased by about 60%. The experiments have also shown that there is an inverse relation between the roll speed and the compact capacity. The results of the study are so encouraging that a new closed circuit compacting machine have been purchased to utilise the powder of SPM plant.