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The lateritic nickel ore was activated mechanically in a planetary ball mill and mineralogical analyses of nickeliferous laterite have been studied by particle size analysis, scanning electron microscopy, X-ray diraction, and the Fourier transform infrared spectroscopy. The results show that the activation procedure led to amorphisation, phase transformation and structural disordering in the laterite structure.

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Malachite, a copper carbonate hydroxide mineral with the formula Cu2CO3(OH)2 was mechanically activated for dierent durations in a planetary mill and analyzed by means of scanning electron microscopy, X-ray diraction, Fourier transform infrared spectroscopy and particle size analysis to investigate the structural alterations in malachite structure. The results showed that decrease in intensity of the X-ray diraction peaks and some alterations in carbonate and hydroxyl units of malachite occurred with increase in mechanical activation duration.