磷石膏制备α半水石膏的研究现状  

Research Status of Preparation of α-Hemihydrate Gypsum from Phosphogypsum

作　　者：李德星 郭荣鑫[1] 林志伟[1] 张绍奇 LI Dexing;GUO Rongxin;LIN Zhiwei;ZHANG Shaoqi(Yunnan Key Laboratory of Disaster Reduction in Civil Engineering,Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]昆明理工大学建筑工程学院,云南省土木工程防灾重点实验室,昆明650500

出　　处：《硅酸盐通报》2022年第3期860-869,共10页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(11962009)。

摘　　要：磷石膏是磷化工企业湿法生产磷酸时排出的工业废渣,因含有大量磷、氟及碱金属盐等杂质,简单堆放填埋处理会带来占用耕地及污染环境等问题。目前最有前景和效益的处理方式是将磷石膏转为α半水石膏(α-HH),但磷石膏的可溶磷、共晶磷及可溶氟等有害杂质是影响磷石膏制备α-HH的主要障碍。因此磷石膏中有害杂质的预处理及α-HH晶体微观形貌调控措施是以磷石膏为原料制备α-HH的研究重点。本文全面综述了磷石膏的理化特性、有害杂质对石膏性能的影响及预处理措施、α-HH制备方法及晶体微观形貌调控等方面的研究现状,探讨了不同预处理措施及α-HH制备方法的优缺点,并对转晶剂调控α-HH晶体微观形貌的机理进行了总结,最后提出了下一步有待解决的问题。Phosphogypsum is a kind of industrial solid waste,which is discharged when the phosphoric chemical industry produces phosphoric acid through the wet process.Because phosphogypsum contains a large amount of impurities such as phosphorus,fluorine,and alkali metal salts,it will be disposed of in a landfill,which will cause problems such as occupation of cultivated land and environmental pollution.At present,the most promising and effective treatment method is to convert phosphogypsum to α-hemihydrate gypsum(α-HH).But the harmful impurities such as soluble phosphorus,eutectic phosphorus and soluble fluorine of phosphogypsum are the main obstacles to the preparation of α-HH from phosphogypsum.Therefore,the pretreatment of harmful impurities in phosphogypsum and the adjustment of α-HH crystal morphology are the focus of research on the preparation of α-HH from phosphogypsum.This article comprehensively reviewed the physicochemical properties of phosphogypsum,the influences of harmful impurities on the properties of gypsum,the pretreatment measures,the preparation method of α-HH and the adjustment of crystal micromorphology,and the current research status.Different pretreatment measures and the preparation methods of α-HH were discussed.The advantages and disadvantages of the method were summarized,and the mechanism of the crystal transformation agent regulating the micro-morphology of α-HH crystals was summarized.Finally,the next problem to be solved was put forward.

关 键 词：磷石膏 杂质 预处理 Α半水石膏 制备方法 转晶剂 晶体形态 吸附机理 

分 类 号：O784[理学—晶体学]