基于新疆粉煤灰成分调控的贝利特水泥熟料煅烧制备工艺研究

Study on the calcination process of Belit cement clinker basedon Xinjiang fly ash composition regulation

以新疆青松建材水泥有限公司生产的P·O 42.5R水泥为目标参照物,从理论计算出发,向新疆粉煤灰中添加SiO_(2)、CaO和Fe_(2)O_(3)三种氧化物进行煅烧,研究了基于新疆粉煤灰成分调控的贝利特水泥熟料煅烧制备工艺。讨论了粉煤灰的球磨时间、高温煅烧温度和煅烧时间对熟料试块抗压强度和抗折强度的影响,对产品的结构和性能进行了表征。结果表明,新疆粉煤灰烧制贝利特水泥熟料的最佳条件为:球磨时间1.5 h、烧结温度1 320℃、烧结时间50 min,此条件下所得熟料试块的最大抗折强度为5.21 MPa,最大抗压强度为42.1 MPa。本研究中所制得的贝利特熟料物相组成上与普通硅酸盐水泥(OPC)比较接近,有比OPC突出的热稳定性,尤其是在600℃以上的环境中。

Taking P·O_(4)2.5R cement produced by Xinjiang Qingsong Building Materials Cement Co.,Ltd.as the target reference,starting from theoretical calculation,certain amount of SiO_(2),CaO and Fe_(2)O_(3) were added into Xinjiang fly ash for calcination.The calcination process of Belite cement clinker based on Xinjiang fly ash composition regulation was studied.The effects of fly ash’s ball milling time,calcination temperature and calcination time on the compressive strength and flexural strength of clinker block were discussed.The structure and properties of the product were also characterized.The results show that the optimum conditions for sintering Belite cement clinker with Xinjiang fly ash are as follows:milling time 1.5 h,sintering temperature 1320℃,sintering time 50min.Under these conditions,the maximum flexural strength and compressive strength of the clinker test block are 5.21 MPa and 42.1 MPa,respectively.The phase composition of belite clinker prepared in this study is close to that of OPC,having better thermal stability than OPC,especially in the environment above 600℃.