Effects of Cooling System and Raw Material Mixture Ratio on the Physical and Chemical Properties of Calcium Aluminum Slag

The effects of cooling system and raw material mixture ratio on the phase composition, self-disintegrating behavior and Al₂O₃ leaching behavior were investigated by XRD, a laser particle size analyzer and chemical analyzer. The results indicated that the key temperature range was between 1200 and 1500 ℃ for phase composition with 5 ℃ /min cooling rate, and the Slag condensation was over and the phase composition had no change under 1200 ℃, the main phases were Ca₁₂Al₁₄O₃₃ and r-Ca₂SiO₄.The self-disintegrating and leaching behavior of the slag became better, and the self-disintegrating rate was more than 90 % and the leaching rate was more than 80 % when A/S(the quality ratio of Al₂O₃ to SiO₂)was 0.5~1.5 and C/A(the molar ratio of CaO to Al₂O₃)was 1.5~1.8.