烧结温度对钢渣陶粒结构及性能的影响

以钢渣为原料制备陶粒,从钢渣陶粒表面玻璃相及孔洞、体积膨胀、内部结构、吸水率及孔隙率、单颗抗压力、矿物相生成及变化等方面探讨烧结温度对所制备陶粒结构与性能的影响。结果表明,随烧结温度升高,陶粒骨架结构逐渐密实,膨胀率增大,表面孔洞增多,内部闭气孔直径增大;烧结温度为1 140℃时,单颗粒抗压力最大,陶粒结构致密度较大,闭气孔密集且均匀,联通气孔较少。钢渣中大量钙元素参与反应,与硅灰及高岭土生成Ca-Si-Al系矿物相钙长石,提供陶粒骨架强度。

Effect of Sintering Temperature on Structure and Properties of Ceramsite Prepared from Steel Slag

The purpose of this study is to investigate the influence of sintering temperature on the structure and properties of ceramsite prepared from steel slag from the aspects of glass phase and pore on the surface of ceramsite,volume expansion,internal structure,water absorption and porosity,single pressure resistance,formation and change of mineral phase.The results show that with the increase of sintering temperature,the framework structure of ceramsite gradually becomes dense,the expansion rate increases,the number of surface holes increases,and the diameter of internal closed pores increases;when the pressure resistance of single particle is maximum at sintering temperature of 1140℃,compared with the ceramsite prepared at other sintering temperatures,the structure of ceramsite is denser,the closed pores are dense and uniform,and the connecting pores are less.A large number of calcium elements in steel slag take part in the reaction,and form Ca-Si-Al mineral anorthite with silica fume and kaolin,which provides ceramsite skeleton strength.