低品位硫铁矿烧渣生产复合硅酸盐水泥工艺优化

Process Optimization on Preparation of Composite Portland Cement with Low-grade Pyrite Cinder

这是一篇矿物材料领域的论文。为因地制宜寻求低品位硫铁矿烧渣的综合利用途径,解决硫铁矿烧渣大量堆存的问题,并缓解土壤及水质污染,进行了低品位硫铁矿烧渣生产复合硅酸盐水泥工艺优化研究。利用硫铁矿烧渣具有铁含量高的特点,作为外加剂,将其掺入水泥熟料、脱硫石膏、粉煤灰等,混合磨细,制备复合硅酸盐水泥,以强度为指标,确定适宜的硫铁矿烧渣掺量。通过对不同硫铁矿烧渣掺量制备的水泥试块进行物理性能检测,利用正交实验对工艺条件进行优化。结果表明,较佳工艺条件为,水泥熟料掺量为55%,钙硅比为2.5,灰渣比为1,水灰比为0.4,在此条件下,实验制得的水泥28 d抗压强度为43.9 MPa,强度等级为42.5。

This is a paper in the field of mineral materials.In order to seek for a new feasible way to utilize low-grade pyrite cinder under local conditions,to solve bottleneck problems of large reserves,and to relieve soil and water pollution,a research on the process optimization on preparation of composite portland cement with low-grade pyrite cinder was conducted.Pyrite cinder as a special kind of industrial solid waste with higher iron content,was used as additive,and was incorporated with portland cement clinker,flue gas desulfurization gypsum and fly ash to prepare composite portland cement.Their efficacy was compared by testing the compressive strength and flexural strength of composite portland cement,based on the analysis of physical indices,and then orthogonal tests were carried out to optimize the preparation.The results showed that the optimum preparation conditions were:mass fraction of portland cement clinker of 55%,Ca to Si ratio of 2.5,fly ash to pyrite cinder ratio of 1.0,and water to material ratio of 0.4.And then,28-day compressive strength was 43.9 MPa.According to the national standard named as Common Portland Cement,the cement mark can reach the level of P·C 42.5.