Abstract
Garnierite ore containing quartz, magnetite and other impurities was ground in a planetary ball mill. Ground ore was subjected to leaching at 297 K in 0.5mol/dm3 HC1 solution. Dry grinding of the ore induces structural change of garnierite from crystalline state into amorphous one, while silica and magnetite still remain as crystalline state. Such mechanically activated garnierite leads to high magnesium (Mg) and nickel (Ni) extraction in the HC1 solution. About 80% Mg and Ni are extracted, while only about 20% Si is extracted. Short time grinding is recommended for an effective extraction of Mg and Ni fromthe ore, with suppressing Si extraction.
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