氧化铁对稳定镁白云石材料性能的影响  

Effect of Iron Oxide on Properties of Stabilized Magnesia Dolomite

作　　者：陶梦雅 高正霞 刘伟 李祥 郭小腾 锁东 田世帅 马成良[1,2] TAO Mengya;GAO Zhengxia;LIU Wei;LI Xiang;GUO Xiaoteng;SUO Dong;TIAN Shishuai;MA Chengliang(School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China;Henan Key Laboratory of High Temperature Functional Ceramics,Zhengzhou 450052,China;Sanmenxia Electromelted Corundum Co.,Ltd.,Sanmenxia,472400,China)

机构地区：[1]郑州大学材料科学与工程学院,河南郑州450001 [2]河南省高温功能材料重点实验室,河南郑州450052 [3]三门峡电熔刚玉有限责任公司,河南三门峡472400

出　　处：《郑州大学学报（工学版）》2023年第4期101-106,共6页Journal of Zhengzhou University（Engineering Science）

基　　金：国家自然科学基金资助项目(51872265);郑州市协同创新重大专项(20XTZX12025)。

摘　　要：为了改善镁白云石材料的性能,以白云石、高硅菱镁矿、硅石、氧化铁粉为主要原料,采用二步煅烧和消化工艺合成氧化铁含量分别0、0.5%、1.0%、1.5%(质量分数,下同)的4个系列的稳定镁白云石砂,再以此为主要原料制备相应4个系列的镁白云石制品。探究了氧化铁含量对试样物理性能、抗水化性、挂窑皮性能的影响,并分析了试样物相组成和显微结构。结果表明:随着氧化铁含量的增加,试样的常温抗折强度和常温耐压强度增大,高温抗折强度和试样黏结强度降低,试样的热震残余强度保持率先升高后降低。当氧化铁含量增加至1.5%时,试样的水化增重率降低至0.12%,抗水化性提高。由XRD谱图分析得出,试样的主晶相为方镁石、硅酸二钙和硅酸三钙,并且随着氧化铁含量的增加,C_(2)S和C_(3)S的衍射峰变强,峰形尖锐,说明氧化铁可以促进C_(2)S和C_(3)S的晶体发育,提高试样的致密度。In order to improve the performance of magnesia dolomite materials,magnesium dolomite refractory materials whose iron oxide content(mass fraction)of 0,0.5%,1.0%,1.5%,respectively,were prepared from natural dolomite,high silicon magnesite,silica and iron oxide powder by two-stage calcination and slaking process.The influence of iron oxide content on the physical properties,hydration resistance and coatability adherence of the samples was investigated.The phase composition and microstructure of the specimens were characterized.The results showed that,as the iron oxide content increased,the room temperature flexural strength and the room temperature compressive strength increased,the high temperature flexural strength and the adherence strength decreased,and the retention rate of the thermal shock strength of the sample first increased and then decreased.With the iron oxide content increasing to 1.5%,the hydration weight gain rate of the sample decreased to 0.12%,and the hydration resistance improved.According to the XRD spectrum analysis,the main crystal phases of the sample were periclase,dicalcium silicate and tricalcium silicate.With the increase of iron oxide content,the diffraction peaks of C_(2)S and C_(3)S became stronger and the peak shapes were sharp.It showed that iron oxide could promote the growth of C_(2)S and C_(3)S crystals and increase the density of the sample.

关 键 词：氧化铁 稳定镁白云石 抗水化性 挂窑皮性能 物理性能 

分 类 号：TQ175.7[化学工程—硅酸盐工业]