烧成制度对高碳铬铁合金渣多孔骨料性能的影响  

Effects of Calcination System on Properties of Lightweight Aggregate Produced from High Carbon Ferrochrome Slag

作　　者：刘辉[1] 廖其龙[1] 刘来宝[1] 张礼华[1] 唐凯靖[1] 张韶华[1] 

机构地区：[1]西南科技大学材料科学与工程学院,四川绵阳621010

出　　处：《非金属矿》2015年第6期37-41,共5页Non-Metallic Mines

基　　金：西南科技大学大学生创新创业训练项目(201410619001)

摘　　要：以高碳铬铁合金渣为主要原料,添加适量黏土制备轻质多孔骨料。研究烧成制度对轻骨料物理性能的影响,并利用X射线衍射仪(XRD)和扫描电镜(SEM)对物相组成及形貌进行分析。结果表明,黏土在1000℃分解产生游离Si O2和铁的氧化物,分别与碳铬渣中镁橄榄石和镁铝尖晶石反应生成顽辉石及铁铝尖晶石固溶体,该过程能有效降低焙烧温度。烧成制度的影响如下:随预热温度升高,气孔孔径减小;焙烧温度及保温时间决定骨料烧胀性,随之增加,表观密度呈降低趋势,颗粒强度先升高后降低;冷却方式严重影响骨料强度,随炉冷却时,骨料内部气孔与基体形成连续架状结构,晶体发育更完整,晶粒更大,该结构使骨料慢冷下强度约为急冷的5倍。Using high carbon ferrochrome slag as main raw material, and adding some amount of clay to prepare lightweight aggregate （LWA）. The effects of preheating temperature, firing temperature, soaking time and cooling types on properties of LWA were researched, and XRD, SEM were used to analyze the phase composition and morphology. The results indicated, in 1000 ~C clay can resolve free SiO2 and iron oxide, which reacted with forsterite and spinel respectively, and generated enstatite and solid solution such as hercynite, this phenomenon effectively lowered firing temperature. The pore size decreased as a rise of preheating temperature, the firing temperature and soaking time made great difference with expansibility of LWA, when they increased, bulk density reduced, particle strength first rose then fell. The cooling types had a strong impact on particle strength, when cooling slowly, it could form a continuous structure, and crystal grew more completely, which resulted as the particle strength of slow cooling aggregate being about 5 times higher than that of rapid cooling.

关 键 词：高碳铬铁合金渣 轻骨料 烧成制度 物理性能 微观分析 

分 类 号：TU528.041[建筑科学—建筑技术科学]