The effect of grinding on precipitated magnesium hydroxide

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Abstract
Magnesium hydroxide, prepared by precipitation, was ground in a vibratory ball mill for 733 h. Samples were withdrawn at intervals, and examined by thermogravimetric analysis and by X‐ray diffraction (the broadening of the lines being analysed using integral breadths), and their specific surfaces were determined by adsorption of nitrogen at —183°.The results indicate that the particles initially consist of small piles of plate‐like crystallites and that they become progressively fractured across their (001) faces, until they are approximately equi‐dimensional. By a process of shearing and re‐adhesion, the piles become increasingly turbostratic in structure, but distortion of the lattice appears only after 350 h. Water is adsorbed on the surface temporarily exposed during grinding and some, at least, of it becomes buried in the interior of the particles.

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