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The batch delamination grinding of coarce filler grade kaolin was studied to produce clay of paper-coating grade having about 85per cent ingredient particles of minus 2 micron in spherical diameter. The coarce clay containing 42per cent particles of minus 2 micron in spherical diameter was ground in wet grinding process under the operation of the vibration mill of 2 litre drum for 3 hours. The effect that was made on the grinding efficiency by the quality of the material, the shapes and dimensions of the grinding medium, by the moisture ratio, by the slurry contents of the mill, and by the amplitude and frequency of the vibration, was studied. It was considered that, for the purpose of maintaining highest possible percentage of ingredient particles of minus 2 micron in spherical diameter, the highest efficiency would be realized by grinding the material by means of ceramic balls of 3φmm in diameter. The product containing 90per cent ingredient particles of minus 2 micron in spherical diameter was obtained on condition of moisture ratio 1, of the mill filled with 63per cent slurry, of amplitude 3.1mm, and of 1500 revolutions per minute. The hexagonal tabular crystals got deformed somewhat irregular. It was considered that, for the purpose of operating delamination, the highest efficiency would be realized by grinding the material by means of nylon pellets, but that it would entail reduction in the percentage of ingredient particles of desired fineness to one third as much as the product to be obtained by grinding the material by means of ceramic balls of 3φmm in diameter.

Delamination Grinding of Coarse Kaolin by Means of the Vibration Mill