Abstract
Delamination and changes in the physico-chemical properties in the grinding of talc were studied using a multi-ring media grinding machine. Products were characterized by SEM, specific surface area, St and aspect ratio, As, determined from the Heywood diameter and thickness measured by a confocal scanning laser microscope. The change in the physico-chemical properties were examined by thermogravimetry and X-ray diffractometry. As and St increase with the increasing rate of revolution. The former levels off at above ca. 1000min-1, while the latter keeps increasing. When the St of products exceeds three times that of the starting material, the crystal structure and the physico-chemical properties of talc change remarkably, indicating the change from the delamination region to the size reduction region. The change between these two operational regions is shown to be controlled by selecting the grinding condition.
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