Abstract: Using ferrotitanium slag and calcia as raw materials,in the CaAl₂O₄-CaAl₄O₇-CaTiO₃ triangle of the Al₂O₃-CaO-TiO₂ phase diagram,the composition of 58% Al₂O₃,34% CaO and 8% TiO₂,by mass,was adopted as the batching formulation,whose aluminate alkalinity was 0.9.Cement clinker samples were prepared after batching,mixing,molding,firing at 1 300,1 400 and 1 450 ℃ for 30 min,respectively,taking out when the furnace interior is cooled to nearly 1 200 ℃,quenching in air,and then grinding (residue≤10% after sieving with a square hole mesh of 0.088 mm).The phase composition and the microstructure of the samples were analyzed.The setting time and the strength were tested.The results show that with the increase of the firing temperature,the amount of CA₂ in the cement clinkers increases and the amount of C₁₂A₇ decreases gradually.The cement clinker fired at 1 400 ℃ has the most CA,the shortest setting time and the highest early strength.

Key words: firing temperature, ferrotitanium slag, titanium-based aluminate cement, setting time, early strength

摘要： 以钛铁渣和氧化钙为原料,在Al₂O₃-CaO-TiO₂系相图的CaAl₂O₄-CaAl₄O₇-CaTiO₃三角形中选择Al₂O₃、CaO、TiO₂质量分数分别为58%、34%、8%的组成点作为配料点,其铝酸盐碱度系数为0.9。经配料、混合、成型后分别在1 300、1 400和1 450 ℃保温30 min,待炉内温度冷却至接近1 200 ℃时,取出置于空气中急冷,再粉磨至0.088 mm方孔筛筛余≤10%,制得水泥熟料试样,然后分析其物相组成和显微结构,检测其凝结时间和强度。结果表明:随着烧成温度的提高,水泥熟料中的CA₂量逐渐增多,C₁₂A₇量逐渐减少。1 400 ℃烧成后水泥熟料试样中的CA量最多,凝结时间最短,早期强度最高。

关键词: 烧成温度, 钛铁渣, 钛基铝酸盐水泥, 凝结时间, 早期强度