The mechanical treatment as a method of Inorganic substances passive

Abstract

The mechanopassivation effect of metal (II) oxides crystallizing by the structural type of halite under attrition treatment has been found out. For the assessment of the activity decrease the following has been investigated: solution and aquation kinetics of CaO and MgO in water and solutions; spinel and calcium carbide formation kinetics using oxides pretreated mechanically by different modes; kinetics of CO2 fixation and thermal desorption from the pretreated oxides surface; magnesia and phosphate cements set rate. It has been determined that the rate of studied processes with the participation of oxides subjected to attrition treatment reduces by a factor of tens and hundreds. We suppose the cause to be the removal of the rough loosened layers containing the most of defects from the polycrystalline aggregates surface. As that neighboring zones accommodate, their surfaces flatten and the bonding area rises. Separated smallest particles form compact aggregates. The powder density increase and sharper diffraction reflection form confirm the microstructure regulating. Flat surfaces with lower quantity of defects provoke the hypoactivity in regard to water vapors and carbon dioxide. The substances mechanopassivation study can be used to control the reaction rate with the participation of highly active reagents.