Abstract
This paper deals with the mixing of diatomaceous earth in air mixers. Diatomaceous earth is a powder with a small bulk density. The positive pressure air mixer was found to be effective in mixing the powder. The negative pressure air mixer however, failed to achieve satisfactory mixing. The volumetric change within particulate materials under an induced loading, that is imposed by the incoming air flow into a confined column, was found to be the prime cause of the failure in mixing the powder. It was then demonstrated that the performance of the negative pressure air mixer will be greatly improved if the mixer is operated in a fluidized bed instead of the spouted bed with the proper initial pressure difference and uniform air velocity within the column.
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