摘要
通过添加不同比例的硅藻土粉,在200℃高温、200 MPa高压条件下烧结制备硅藻土-磷石膏复合材料。采用X射线衍射(XRD)仪、扫描电子显微镜(SEM)、颗粒(孔隙)及裂隙图像识别与分析系统(PCAS)软件等,研究硅藻土掺量对磷石膏体系物相、显微组织形貌、孔隙结构的影响。结果表明,不同磷石膏体系在高温高压条件下,矿物种类及含量发生了明显变化,二水石膏全部转化为硬石膏,且硬石膏含量随硅藻土掺量增加而减少;生成的硬石膏多呈板状、板条状、柱状、棒状或晶须状,长径比增大,晶体生长均匀性变差;随着硅藻土掺量增加,磷石膏体系孔隙度增大,样品致密度降低。
Diatomite phosphogypsum composite was prepared by adding a different proportion of diatomite powder at a high temperature of 200℃and high pressure of 200 MPa.The effect of diatomite content on the phase,microstructure and pore structure of the phosphogypsum system was studied by X-ray diffraction(XRD),electron scanning microscope(SEM)and PCAS software.The results show that the mineral types and contents of different phosphogypsum systems have changed significantly under high temperature and high pressure,the mineral of each phosphogypsum system is completely transformed from dihydrate gypsum to anhydrite,and the anhydrite content decreases with the increase of diatomite content;the anhydrite is mostly in the shape of the plate,strip,column,rod or whisker,with the increase of length diameter ratio,the uniformity of crystal growth becomes worse;with the increase of diatomite content,the porosity of the phosphogypsum system becomes larger,resulting in the decrease of the density of the sample.
作者
周登峰
单双明
杨瑞东
罗朝坤
倪莘然
汪龙波
Zhou Dengfeng;Shan Shuangming;Yang Ruidong;Luo Chaokun;Ni Xinran;Wang Longbo(School of Resources and Environmental Engineering,Guizhou University,Guiyang,Guizhou 550025;Key Laboratory of Karst Geological Resources and Environment,Ministry of Education,Guizhou University,Guiyang,Guizhou 550025;Institute of Geochemistry,Chinese Academy of Sciences,Guiyang,Guizhou 550002)
出处
《非金属矿》
CSCD
北大核心
2021年第4期1-3,共3页
Non-Metallic Mines
基金
国家重点研发计划项目(2018YFC1903500)。
关键词
硅藻土
磷石膏
高温高压试验
硫酸钙晶须
长径比
孔隙度
diatomite
phosphogypsum
high temperature and high pressure test
calcium sulfate whisker
aspect ratio
porosity
