用脱硫石膏代替天然石膏进行硫铝酸盐水泥熟料制备试验研究.结果表明:用本试验所采用的原料,配料比为m(矾土)∶ m(石灰石)∶ m(脱硫石膏)=35∶ 43∶ 22,煅烧温度为1400 ℃可烧制成矿物组成为无水硫铝酸钙和硅酸二钙的合格硫铝酸盐水泥熟料.从外观特征及借助XRD、SEM分析温度对水泥熟料烧结的影响,当烧结温度为1300 ℃时,熟料结构酥松,强度低,其主晶相为C_4A_3 、β-C_2S、2C_2~-S·CaSO_4,熟料为欠烧料;当烧成温度为1400 ℃时,熟料结构致密,强度高,形成的主要矿物为C_4A_3 、β-C_2~-S和C_4AF,属于正常合格的硫铝酸盐水泥熟料;当烧成温度为1500 ℃时,出现液相过多,熟料块坚硬,主晶相为C_4A_3 、β-C_2~-S、C_12A_7、CT,熟料为过烧料.
An experimental research on the preparation of sulphoaluminate cement clinker with desulphogypsum instead of natural gypsum has been performed.The results show that the burden ratio of raw materials is m(bauxite)∶ m(limestone)∶ m(desulphogypsum)=35∶ 43∶ 22, the best calcination temperature was determined of 1400 ℃. Under the process conditions, qualified sulphoaluminate cement clinker can be produced and main mineral composition of cement clinker are calcium sulphoaluminate and dicalcium silicate. Effects of calcination temperature on clinkering process was explored by observing appearance characteristics and by the means of XRD and SEM. At 1300 ℃,the clinker is underburnt with loose structure, lower strength and the main crystal phase of C_4A_3 ,β-C_2S and 2C_2~-S·CaSO_4; at 1400 ℃, it is normal and qualified clinker with tight structure, higher strength and the main crystal phase of C_4A_3 ,β-C_2~-S and C_4AF; at 1500 ℃, it is overburnt clinker with excessive liquid, harder bulk and the main crystal phase of C_4A_3 , β-C_2~-S, C_12A_7and CT.
参考文献
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