四元矿化剂对硅砖微观形貌及物理性能的影响  

Effect of Quaternary Mineralizer on Microstructure and Physical Properties of Silica Brick

作　　者：王家燕 董博 余超[1] 邓承继[1] 丁军[1] 祝洪喜[1] WANG Jiayan;DONG Bo;YU Chao;DENG Chengji;DING Jun;ZHU Hongxi(The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学省部共建耐火材料与冶金国家重点实验室,武汉430081

出　　处：《硅酸盐通报》2023年第3期1115-1121,共7页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金联合基金(U21A2057);湖北省重点研发计划(2021BAD002,2022BAA032)。

摘　　要：以两种不同粒径的石英砂为原料,石灰乳和纸浆废液为结合剂,经1430℃高温烧成制备硅砖,研究复合矿化剂及保温时间对硅砖物相组成、显微结构及主要物理性能的影响规律。研究结果表明,经1430℃保温10 h后,烧成试样由鳞石英、方石英及少量残余石英组成。添加铁鳞粉-CaO-MnO_(2)-SiC或铁鳞粉-CaO-MnO_(2)-TiO_(2)四元矿化剂时,硅砖中典型的骨料-基质耐火材料结构消失,并逐步出现“均质化”效应。当矿化剂为铁鳞粉-CaO-MnO_(2)-TiO_(2)时,经1430℃保温10 h后,烧成试样具有较好的综合性能,其体积密度、显气孔率及常温耐压强度分别约为(1.93±0.01)g·cm^(-3)、(14.9±0.1)%及(55.05±0.64)MPa。在最佳矿化剂组分及烧成制度基础上,延长保温时间至15或20 h时,材料中残余石英含量降低,但鳞石英含量增大,导致体积膨胀效应增强,使材料的物理性能受损。Quartz sand with two kinds of particle sizes was used as raw materials and the lime milk and waste paper pulp were used as binders to prepare silica brick after sintering at 1430℃.The effects of multi-mineralizer and holding time on the phase composition,microstructure and main physical properties of silica brick were studied.The results show that the fired specimen is composed of tridymite,cristobalite,and a small content of residual quartz after sintering at 1430℃for 10 h.With the addition of iron scale powder-CaO-MnO_(2)-SiC or iron scale powder-CaO-MnO_(2)-TiO_(2),the typical aggregate-matrix refractory structure in silica brick disappears,as well as the homogenization effect appears.The fired specimen has good comprehensive properties after sintering at 1430℃for 10 h when the mineralizer is iron scale powder-CaO-MnO_(2)-TiO_(2),and the bulk density,apparent porosity,and cold crushing strength are(1.93±0.01)g·cm^(-3),(14.9±0.1)%,and(55.05±0.64)MPa,respectively.Based on the optimal mineralizer composition and firing system,when the holding time is extended to 15 or 20 h,the residual quartz content in the material decreases,and tridymite content increases,which make that the volume expansion effect is enhanced,and the physical properties of the material are damaged.

关 键 词：硅砖 复合矿化剂 物相组成 鳞石英 方石英 残余石英 显微结构 物理性能 

分 类 号：TQ175[化学工程—硅酸盐工业]