高贝利特硫铝酸盐熟料矿物组成优化

Optimization of Mineral Composition of High Belite-sulphoaluminate Clinker

采用石灰石、矾土、黏土和石膏4种原料,制备了以贝利特、无水硫铝酸钙和铁相为主的高贝利特无水硫铝酸盐水泥(BCSA)熟料矿物体系,研究了其生料易烧性、熟料煅烧制度和熟料矿物优化配比等。结果表明:当BCSA熟料煅烧温度为1280～1320℃时,可获得结晶度良好、形成数量较多的贝利特和无水硫铝酸钙矿物。在BCSA熟料矿物组成为32%～42%C4A3—S、5%～9%C4AF、46%～56%C2S,石膏掺量为12.5%时,水泥28 d抗压强度达最佳,为55MPa。此外,由于熟料烧成温度及氧化钙总含量(约50%)均较低,BCSA水泥在能耗和排放方面均比普通硅酸盐水泥低。

The belite-calcium sulphoaluminate cement （BCSA） clinker with belite（C2S） of 35%-65%, calcium sulphoaluminate （C4A3S） of 20%-50%, and ferrite （CaAF） of 5%-15% was prepared with four major raw materials like limestone, bauxite, clay and gypsum. Two aspects on the preparation of BCSA clinker are （1） burnability of raw meal and （2） optimization of clinker phasesand gypsum content in cement. The results show that the cement with clinker burned during 1 280-1 320 ℃ containing C4A3S of 32%-42%, C4AF of 5%-9%, C2S of 46%-56% and gypsum of 12.5% can give the average mechanical strength of 55 MPa at 28 days. Compared to OPC, the BCSA cement consumes less energy and emits less emission.