INFLUENCE OF MODIFYING ADDITIVES ON THE PROCESSES OF SYNTHESIS OF CLINKER MINERALS OF HIGH ALUMINA CEMENT

The article presents the results of studying effect modifying additives CaAl2O4 (CA) and CaAl4O7 (CA2), as well boric acid on processes phase formation clinker minerals. calculation content raw materials in charge is carried out taking into account production high-alumina with participation Al2O3 71–72 wt.% CaO 27–28 wt.%. In accordance state diagram CaO–Al2O3 system, mass amount accumulates two calcium aluminate phases: CA 64 CA2 36 Chalk grade M-90 commercial alumina G-0 are used feedstock. Heat treatment powder mixtures different concentrations temperature range 1250 - 1350°C isothermal holding for 1 2 hours. It has been established that when 0,5 % H3BO3 introduced charge, design ratio phases appears after heat at 
 1350 °C An increase to 1,0 allows obtain a composition close one time hour. shown introduction HAC mixture affects quantitative products. A correlation between decrease unreacted α-alumina samples heat-treated