脱硫石膏两步法制备类球状α-半水硫酸钙  

Two-Step Preparation of Quasi-Sphericalα-Calcium Sulfate Hemihydrate from Flue Gas Desulphurization Gypsum

作　　者：马文静 郜丽丽 李雲 陈学青[1] 郭宏飞[1] 李治水 曹吉林[1] MA Wen-Jing;GAO Li-Li;LI Yun;CHEN Xue-Qing;GUO Hong-Fei;LI Zhi-Shui;CAO Ji-Lin(Engineering Research Center of Seawater Utilization Technology of Ministry of Education,School of Chemical Engineering and Technology,Hebei University of Technology,Tianjin 300130,China;Heze Center for Disease Control and Prevention,Heze,Shandong 274010,China;Tianjin Bohua Yongli Chemical Industry Co.,Ltd.,Tianjin 300452,China)

机构地区：[1]河北工业大学化工学院,海水资源高效利用化工技术教育部工程研究中心,天津300130 [2]菏泽市疾病预防控制中心,菏泽274010 [3]天津渤化永利化工股份有限公司,天津300452

出　　处：《无机化学学报》2021年第8期1430-1438,共9页Chinese Journal of Inorganic Chemistry

基　　金：中国科学院天然气水合物重点实验室(中国科学院广州能源研究所)(No.E029kf1601);河北省自然科学基金青年基金(No.B2020202081);河北省高等学校科学技术研究项目(No.QN2019012)资助。

摘　　要：以烟气脱硫石膏为原料,在N,N′-亚甲基双丙烯酰胺(MBA)的调控下,采用两步水热法合成了6~10μm的类球状α-半水硫酸钙(α-CSH)。通过红外光谱分析、能谱分析以及不同乙二醇浓度条件实验,研究了MBA对α-CSH形貌和尺寸的影响及MBA的调控机理。研究发现,MBA可优先吸附在α-CSH的(111)面上,抑制α-CSH沿c轴方向生长;同时,MBA可以形成三维凝胶网络限域α-CSH的成核和生长。经过物理洗涤和两步化学水热处理,α-CSH的白度由39.22%提高至92.06%。The quasi-sphericalα-calcium sulfate hemihydrate(α-CSH)with the size of 6~10μm has been synthesized from flue gas desulphurization(FGD)gypsum by two-step hydrothermal method under the regulation of N,N′-methylenediacrylamide(MBA).The effect of MBA addition on the morphology and size ofα-CSH product and the regulation mechanism was investigated by FTIR and EDS measurements as well as ethylene glycol concentrationdependent experiments.MBA could be preferentially absorbed on the(111)plane ofα-CSH to inhibit the growth ofα-CSH along c axis,and form a three-dimensional gel network to exert the confinement effect on the nucleation and growth ofα-CSH particles.In addition,after undergoing physical washing and two-step chemical hydrothermal treatment,the whiteness of the synthesizedα-CSH was improved from 39.22%to 92.06%.

关 键 词：烟气脱硫石膏 α-半水硫酸钙 两步水热法 N N′-亚甲基双丙烯酰胺 

分 类 号：TQ177.3[化学工程—硅酸盐工业]