Structural Defects in Silica during High Intensity Grinding Process
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Abstract
Ultra fine particles (below 5µm) is accomplished via comminution. However during high intensity grinding process the structure of the ground material will be distorted and this brings qualitative changes in the nature of the fine particles. Structural changes are clearly evident in fine particles during fine grinding where the energy delivered by the mill is applied to bending or breaking of the crystal, which leads to structural alteration, by loss of regularity in the crystalline network. The degree of crystallinaty was characterised based on the XRD measurement. The presence of defects or random disorder was evident by the loss or reduction of peak intensity along the diffractograms with the broadening effect at the base of the peak. The percentage of crystallinity decreased from 100% before grinding to 35.44% after 600s of grinding. The d₅₀ value also plays an important role to the degree of crystallinity. When the particle size was 1.15µm, the degree of crystallinity was around 35.44%.
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