冷却制度及物料配比对铝酸钙炉渣物化性能的影响

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

通过XRD、激光粒度分析以及化学分析等手段系统研究了冷却制度及物料配比对铝酸钙炉渣物相组成、自粉性能以及炉渣中Al2O3的浸出性能等物化性能的影响.结果表明:炉渣熔体在降温速度为4～5℃/min的条件下,1200℃至1500℃是物相形成的关键性温度区间,1200℃以下,炉渣凝结结束,物相组成不变,形成的主要物相为Ca12Al14O33及r-Ca2SiO4.炉渣A/S(Al2O3/SiO2摩尔比)在0.5～1.5之间,C/A(CaO/Al2O3摩尔比)为1.5～1.8时,自粉及浸出性能良好,自粉率均在90%以上,Al2O3浸出率达80%以上.

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.