磷石膏焙烧法制备β-半水石膏  

Preparation of β-hemihydrate gypsum by phosphogypsum roasting

作　　者：郭泽 张鹏飞 杨帆[1] 张汉泉[1] 路漫漫[1] GUO Ze;ZHANG Pengfei;YANG Fan;ZHANG Hanquan;LU Manman(School of Resources&Safety Engineering,Wuhan Institute of Technology,Wuhan,430073,China)

机构地区：[1]武汉工程大学资源与安全工程学院,湖北武汉430073

出　　处：《无机盐工业》2023年第10期106-113,共8页Inorganic Chemicals Industry

基　　金：国家自然科学基金项目(51374156);武汉工程大学研究生教育创新基金资助项目(CX2022574)。

摘　　要：针对磷石膏焙烧制备β-半水石膏过程中温度、时间等关键热工参数控制困难、能耗高的问题,采用静态焙烧和多级动态焙烧两种焙烧方式进行对比,探索磷石膏及浮选纯化后的磷石膏焙烧制备β-半水石膏的最佳热工参数和技术指标。结果表明:纯化磷石膏采用多级动态焙烧制备出的石膏产品在β-半水石膏含量和力学性能方面均优于磷石膏原样。纯化磷石膏在180℃下动态焙烧60 min,可得到β-半水石膏质量分数为87.45%的产品,其初凝、终凝时间分别为3、9 min,2 h抗折抗压强度分别达到3.5、7.8 MPa,满足GB/T 9776—2022《建筑石膏》3级品要求,可以用于建筑石膏行业。In view of the difficulties in controlling temperature,time and other key thermal limits in the process of roasting phosphogypsum to prepareβ-hemihydrous gypsum and high energy consumption,static roasting and multistage dynamic roasting were compared to explore the best thermal constants and technical indexes of phosphogypsum and phosphogypsum roasting after purification by flotation to prepareβ-hemihydrous gypsum.The results showed that the content and mechanical properties ofβ-hemihydrate gypsum products prepared by multistage dynamic roasting purified phosphogypsum were better than original phosphogypsum.After the purified phosphogypsum was roasted at 180℃for 60 min,β-hemihydrate gyp⁃sum content of 87.45%was gained.The initial and final setting time remained 3 min and 9 min,respectively,and the 2 h flexural and compressive strength reached 3.5 MPa and 7.8 MPa,respectively,which met the requirements of national stan⁃dard Grade 3 products and could be used in the construction gypsum industry.

关 键 词：磷石膏 浮选 焙烧 β-半水石膏 

分 类 号：TQ132.32[化学工程—无机化工]