以气态硫磺还原磷石膏作全钙源制备贝利特硫铝酸盐水泥  

Preparation of Belite Sulfoaluminate Cement Using Phosphogypsum Reduced by Gaseous Sulphur as Sole Calcium Oxide Source

作　　者：陈延信[1] 苏嘉豪 赵博[1] 宋强[1] 聂娇 CHEN Yanxin;SU Jiahao;ZHAO Bo;SONG Qiang;NIE Jiao(College of Materials Science and Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China)

机构地区：[1]西安建筑科技大学材料科学与工程学院,陕西西安710055

出　　处：《建筑材料学报》2023年第12期1292-1302,共11页Journal of Building Materials

基　　金：“十三五”国家重点研发计划项目(2016YFB0303400,2017YFB0309903-03);陕西省重点研发计划项目(2020GY-260,2021GY-203);陕西省教育厅重点科研项目(20JS079,20JY040);陕西省科技创新团队(2021TD-53)。

摘　　要：以气态硫磺还原磷石膏(PG)作为全钙源,采用分段煅烧制度制备了贝利特硫铝酸盐水泥,并采用X射线衍射仪、傅里叶红外光谱仪等研究了其矿物相组成与水化性能.结果表明:贝利特硫铝酸盐水泥的主要矿物相为Ca_(4)Al_(6)(SO_(4))O_(12)(C_(4)A_(3)S)、Ca_(2)SiO_(4)(β-C_(2)S)和Ca_(8)Fe_(4)Al_(4)O_(20)(C_(4)AF),同时含有少量的钙铝黄长石(C_(2)AS)和alpha'-Ca_(2)SiO_(4)·0.05Ca_(3)(PO_(4))2(α'-C_(2)S);随着煅烧温度和煅烧时间的增加,C_(4)A_(3)S的含量增加,但煅烧温度超过1300℃,煅烧时间超过90 min后会对C_(4)A_(3)S的形成产生不利的影响;过度煅烧熟料各龄期的强度都会降低,对其早期强度的发展产生了不利的影响,但对其后期强度的发展有利.Belite sulfoaluminate cement was prepared by the segmental calcination system using phosphogypsum(PG)reduced by sulfur gas as the sole calcium oxide source.The mineral phase composition and hydration properties were studied by X‑ray differaction and Fourier infrared spectrum.The results show that main mineral phases of the clinker are Ca_(4)Al_(6)(Sc)O_(12)(C_(4)A_(3)S),Ca_(2)SiO_(4)(β‑C_(2)S)and Ca_(8)Fe_(4)Al_(4)O_(20)(C_(4)AF),with small amounts of gehlenite(C_(2)AS)and alpha'‑Ca_(2)SiO_(4)·0.05Ca_(3)(PO_(4))2(α'‑C_(2)S).When the calcination temperature and calcination time are increased,the content of C_(4)A_(3)S increases.However,above 1300°C and 90 min,the formation of C_(4)A_(3)S is adversely affected.Excessive calcination will reduce the strength of the clinker at each age,which is disadvantageous for its early strength development and is beneficial to its later strength development.

关 键 词：磷石膏 熟料烧成 矿物组成 贝利特硫铝酸盐水泥 

分 类 号：TQ172.4[化学工程—水泥工业]