铁尾矿掺量对尾矿瓷质砖性能和结构的影响  

Effect of Iron Tailings Addition Content on the Performance and Microstructure of Porcelain Tiles

作　　者：陈永亮[1,2] 杜金洋 张惠灵[1,2] 张一敏[1] CHEN Yongliang;DU Jinyang;ZHANG Huiling;ZHANG Yimin(School of Resources and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,China;Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学资源与环境工程学院,武汉460081 [2]武汉科技大学冶金矿产资源高效利用与造块湖北省重点实验室,武汉460081

出　　处：《中国陶瓷》2018年第11期42-47,共6页China Ceramics

基　　金：国家“十一五”科技支撑计划重点项目(2007BAB15B02);湖北省教育厅科学技术研究项目(Q20141108);国家自然科学基金项目(41571306)

摘　　要：以湖北某地低硅铁尾矿为主要原料制备瓷质砖,考察了铁尾矿掺量对瓷质砖性能、结构及烧成温度的影响,分析了其影响的作用机理。结果表明,铁尾矿可以促进烧结过程中液相的生成,降低烧成温度,然而掺入过多的铁尾矿则会导致瓷质砖烧成温度范围变窄,在铁尾矿掺量为55%~65%范围内,样品性能满足国家标准陶瓷砖(GB/T4100-2015)中对于干压瓷质砖的要求,其烧成温度范围大于40℃。分析表明,由于铁尾矿中铁、钙含量较高,其可与原料中的石英及硅铝酸盐反应形成低共熔物,促进坯体的烧结致密,随着铁尾矿掺量的进一步增加,坯体中形成富余Fe2O3、CaO的液相,其高温粘度随温度的升高而急剧下降,导致样品膨胀变形而烧成温度范围变窄。Porcelain tiles were prepared with the low-silicon iron tailings from Hubei province of China as the main raw materials, the effects of tailings content on properties, microstructure and firing temperature of porcelain tiles were investigated, and the mechanism of effects were analyzed. The results showed that the iron tailings addition could promote the formation of liquid phase and lower the firing temperature,but excess tailings addition could narrow firing densification interval. The obtained samples with iron tailings addition content of 55 ~65 wt% were conformed to the requirements for drying press porcelain tiles in Chinese standard specifications Ceramic Tiles(GB/T4100-2015), revealed a densification interval of more than 40 ℃. The mechanism analysis indicated that the high content of Fe and Ca in iron tailings reacted with quartz and aluminosilicate and formed eutectic solution at lower temperature, thus promoted the firing densification of porcelain tiles samples. With the increasing addition amount of the tailings, the liquid phases of samples with more Fe2 O3 and CaO were formed, the liquid viscosity quickly decreased with increasing temperature and gave rise to overfiring with deformation of samples at lower temperature, and then narrowed the firing temperature interval.

关 键 词：铁尾矿掺量 瓷质砖 性能 烧成温度 

分 类 号：TQ174.4[化学工程—陶瓷工业]