One Of The Active Materials Silicon Magnesium

Powders with silicon magnesium as the main phase were prepared by self-propagating high-temperature synthesis technology, and then single-phase MgSiN2 powders were obtained by removing impurities using an acid washing process. The effects of raw material ratio, the amount of diluent MgSiN2 added and N2 pressure on the phase composition of the combustion synthesis product were studied, and the effect of acid washing conditions on the removal of MgO impurities was discussed. It is difficult to directly synthesize single-phase MgSiN2 powders by self-propagating high-temperature synthesis using raw materials prepared in a stoichiometric ratio; making Mg powder excessive in the raw materials and acid washing the self-propagating high-temperature synthesis product is a simple, practical and effective method for preparing single-phase MgSiN2 powders.

1.The sphenanthene particles of silicon magnesium have nanometer-scale particle size and high positive charge, and their positive charge gradually decreases with the increase of pH value; with the extension of grinding time, the particle size of sphenanthene particles gradually decreases, but their positive charge also decreases significantly. When sphenanthene cationic particles are used alone as a retention agent, they have a certain retention effect, but their dosage is large and the effect is general, and their shear resistance is poor, which is not an ideal retention and drainage system. The binary retention system composed of sphenanthene particles and APAM has a good retention effect, among which the system composed of unground sphenanthene particles/APAM has good shear resistance and pH adaptability. Therefore, the retention system composed of unground sphenanthene particles and APAM is an ideal retention and drainage system.

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