Ce2O3掺杂对白云石烧结性能的影响  

Influence of Ce2O3 Doping on the Sintered Properties of Dolomite

作　　者：方燕 张汪年[1] 邓宁[1] 许欢[1] 黄仁佑 王新海[1] Fang Yan;Zhang Wangnian;Deng Ning;Xu Huan;Huang Renyou;Wang Xinhai(School of Mechanical and Materials Engineering,Jiujiang University,Jiujiang,Jiangxi 332005)

机构地区：[1]九江学院机械与材料工程学院,江西九江332005

出　　处：《非金属矿》2020年第3期53-56,共4页Non-Metallic Mines

基　　金：江西省“十二五”重点学科(材料加工工程)建设项目;江西省教育厅科学技术研究项目(GJJ170948)。

摘　　要：以天然白云石为原料,添加不同含量Ce2O3粉末,通过二步煅烧法制备白云石熟料。利用X射线衍射仪、扫描电子显微镜及显气孔体密测定仪分析Ce2O3粉末对白云石熟料烧结性能、物相组成、微观结构影响。结果表明,在白云石中添加Ce2O3粉末有利于提高白云石烧结致密性,促进CaO、MgO晶粒长大。未添加Ce2O3粉末时,压制圆柱形试样经1600℃保温3 h高温烧结前后线变化率为26%,显气孔率为2.4%,体积密度为3.13 g/cm^3,MgO晶粒尺寸为3.38μm;加入质量百分数为0.75%Ce2O3粉末时,由于高温烧结过程中,Ce2O3可以与CaO发生固溶反应,引起CaO晶格畸变,降低晶体活化能,导致试样烧结前后线变化率增大为30%,制备白云石熟料体积密度为3.25 g/cm3,显气孔率为1.0%,MgO晶粒尺寸为5.89μm。The dolomite doped by Ce2O3 powders in different mass fractions was prepared by high-temperature calcination using natural dolomite as the raw materials in this study.The effects of Ce2O3 doping on the sintered properties,phase composition,and microstructures of dolomite clinker were characterized by apparent porosity tester,X-ray diffractometer,and scanning electron microscope.The results show that,the Ce2O3 doping can improve the compactness of dolomite clinker and promote the growth of MgO and CaO grain.Without the Ce2O3 doping,the line rate,bulk density,and apparent porosity of the dolomite clinker after sintering at 1600℃are 26%,3.13 g/cm^3,and 2.4%,respectively,and the particle size of MgO is 3.38μm.The line rate,bulk density,and apparent porosity of the dolomite clinker doped by Ce2O3 powders in the mass fraction of 0.75%after sintering at 1600℃are 30%,3.25 g/cm3,and 1.0%,respectively,and the particle size of MgO reaches to 5.89μm.The sintered dolomite doped by Ce2O3 powders at 1600℃can lead to the solid solution bewteen CaO and Ce2O3,cause the lattice distortion of CaO,reduce the activation energy of grain growth,and consequentially promote the sintering compactness of the dolomite.

关 键 词：白云石 掺杂 烧结性能 物相组成 微观结构 

分 类 号：TQ175.75[化学工程—硅酸盐工业]