Influence of crystal structure on mechanical activation effect
摘要
The effect of mechanical treatment on pyrite and molybdenite was studied. After mechanically activatedfor 40 min under the same condition, the apparent activation energy for leaching reaction of layer-structured molyb-denite in HNO3-H2SO4 solution becomes 6.0 kJ/mol lower than that for untreated one; while for isotropic pyrite,this value is 18.3 kJ/mol. Pyrite seems to be more sensitive towards mechanical activation. Resorting to the differ-ence in crystal structure, it is considered that anisotropic molybdenite may obviate violate mechanical action throughinter-layer slippage, while isotropic pyrie can not. So the action may damage pyrite crystal and produce large amountof lattice imperfection. Consequently, more mechanical energy is absorbed by pyrite crystal. So it is one-sighted tcconsider the mechanical activation effect according to only crystal lattice energy. Crystal structure, isotropy or ani-sotropy, is an important parameter which affects a lot.