利用低品位铝矾土和铸造废砂制备高贝利特硫铝酸盐水泥的研究  

Preparation of High Belite Sulphoaluminate Cement by Low Grade Bauxite and Foundry Waste Sand

作　　者：谭俊华[1] 史熙亮 朱开金[1] 赵彦亮[1] 彭军辉[1] 

机构地区：[1]太原工业学院,太原030008 [2]中铁六局集团石家庄铁路建设有限公司,石家庄130100

出　　处：《硅酸盐通报》2017年第12期4284-4290,4301,共8页Bulletin of the Chinese Ceramic Society

基　　金：山西省重点学科材料科学与工程资助项目

摘　　要：采用正交试验研究利用低品位铝矾土、铸造废砂、石灰石、石膏等原料制备高贝利特硫铝酸盐水泥的煅烧条件。对生料热稳定性、水泥熟料组成及其水化产物形貌等进行测试表征。可初步确定熟料的煅烧温度范围在1250~1360℃,该水泥熟料的主要矿物组成为贝利特和无水硫铝酸钙,用X-射线K值法定量分析熟料物相组成与理论计算值基本接近。该水泥的主要水化产物有钙矾石、水化硅酸钙凝胶、单硫型水化硫铝酸钙等。实验研究表明:煅烧温度1300℃,保温时间90 min,急冷,制得的高贝利特硫铝酸盐水泥凝结时间短,初凝时间30 min,终凝仅40min,28 d水泥净浆强度可达65.4 MPa,胶砂强度与市售42.5硫铝酸盐水泥相比,早期强度比较接近,后期强度高出10%。The calcination conditions of high belite sulphoaluminate cement（ HBSC） were studied by the design orthogonal test method,which was prepared by raw materials include low quality bauxite,foundry waste sand, limestone and gypsum. Thermochemical changes in raw materials, the structure and morphology of clinker and hydration products were analyzed by means of simultaneous DSC-TG apparatus,scanning electron microscopy and X-ray diffraction. It can be preliminarily determined the clinker calcining temperature range from 1250 ℃ to 1360 ℃,the main mineral composition of the cement clinker as belite and anhydrous calcium sulphoaluminate. Using K value method with X-ray in quantitative of clinker phases, the composition of the clinkers are approximately the same as the theoretical calculation. The hydration products of HBSC are mainly AFt, C-S-H gel, AFm, etc.Experimental results show that： the optimum calcined temperature is 1300 ℃,soaking time is 90 min,quick cooling. The initial setting time of HBSC was 30 min,the final setting time just 40 min. The strength of cement pastes can be reached 65. 4 MPa at 28 d. Compared to sulphoaluminate cement 42. 5,the early strength of both was close to,but the 28 d strength was 10% higher than the latter.

关 键 词：高贝利特硫铝酸盐水泥 煅烧制度 矿物组成 K值法 抗压强度 

分 类 号：TQ172.746[化学工程—水泥工业]