醇-无氯盐体系磷石膏制备α-半水石膏的研究  

Research on the Production of α-Hemihydrate Gypsum from Phosphogypsum of Alcohol-Non-Chlorine Salt System

作　　者：张锐横 郑光亚 魏兴 许世斌 夏举佩[1,2,3] Zhang Ruiheng;Zheng Guangya;Wei Xing;Xu Shibin;Xia Jupei(Faculty of Chemical Engineering,Kunming University of Science and Technology,Kunming,Yunnan 650500;Yunnan Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus Materials,Kunming,Yunnan 650500;The Higher Educational Key Laboratory for Phosphorous Chemical Engineering of Yunnan Province,Kunming University of Science and Technology,Kunming,Yunnan 650500)

机构地区：[1]昆明理工大学化学工程学院,云南昆明650500 [2]云南省磷化工节能与新材料重点实验室,云南昆明650500 [3]昆明理工大学云南省高校磷化工重点实验室,云南昆明650500

出　　处：《非金属矿》2021年第1期16-19,共4页Non-Metallic Mines

基　　金：国家自然科学基金(21566018)。

摘　　要：为解决醇水法以磷石膏为原料制备α-半水石膏醇耗量大、反应时间长等问题,采用丙三醇、硝酸锌、硫酸钾的醇盐反应体系,以N-[3-(三甲氧基硅基)丙基]乙二胺(KH792)为改变晶体形貌的偶联剂,制备α-CaSO_4·0.5H_2O。试验所得较优工艺条件为:液固比5∶1,温度105℃,醇水比25%,硝酸锌掺量25%,硫酸钾掺量3%,溶液p H值6,反应时间4 h,KH792掺量0.5%。醇盐体系中掺入3%硫酸钾有效缩短了脱水反应时间,掺入0.5%KH792使晶体从长柱状体变为片状或多孔柱状体,有效促进了晶体的二次发育。In order to solve the problems of large alcohol consumption and long reaction time in the preparation of hemihydrate gypsum alcohol with phosphogypsum as raw material,the alkoxide reaction system of glycerol,zinc nitrate and potassium sulfate with the N-[3-(trimethoxysilyl)propyl]ethylenediamine(KH792)as a coupling agent changing crystal morphology was employed to the synthesis ofα-CaSO4·0.5 H2O(α-HH).The optimal process conditions obtained from experiment are as follows:liquid-solid ratio is 5∶1,reaction temperature is 105℃,alcohol-water ratio is 25%,the addition amount of zinc nitrate is 25%,potassium sulfate content is 3%,the pH of the solution is 6,and the reaction time is 4 h,KH792 dosage is 0.5%.The results showed that 3%potassium sulfate in the alkoxide system effectively shortened the dehydration reaction time,0.5%KH792 changed the crystal from a long columnar body to a sheet or porous columnar body,which effectively promoted the secondary growth of the crystal.

关 键 词：磷石膏 半水石膏 醇盐体系 硅烷偶联剂 晶型 

分 类 号：TQ126.3[化学工程—无机化工]