气淬法制备高炉渣玻璃微珠的性能

Properties of Glass Beads Prepared by Gas Quenching of Blast Furnace Slag

通过实验分别检测了高炉渣珠的堆积密度、粒度分布、化学侵蚀性、筒压强度和表观特性.结果表明,堆积密度随粒径的增加先增加后减小,0.3～1 mm粒径范围内渣珠堆积密度最大,并且渣珠粒径主要集中在0.30～1.0 mm之间,成珠率较高;渣珠不耐酸,在同一侵蚀溶液中,粒径较大的渣珠的抗侵蚀能力强于粒径较小的渣珠;粒径越小,渣珠筒压强度越大,渣珠承受压力的能力越强;高炉渣珠表面光滑平整,呈圆球状,粒径大小均匀;由于渣珠气淬的冷却速率较快,渣珠非晶相含量较高,当渣珠粒径<0.30 mm时,XRD曲线变为馒头峰,基本不再有晶相析出,矿相变为非晶相.

The bulk density,particle size distribution,chemical erosion,cylindrical compressive strength and morphology of air-quenched BFS(blast furnace slag)are measured by experiments.The results show that the bulk density increases first and then decreases with the increase of particle size and is the largest in the particle size range of 0.30~1.0 mm.The size of slag beads is mainly between 0.30~1.0 mm where the bead yield is high.The slag beads do not resist acid erosion.In terms of erosion resistance,larger slag beads are better than smaller ones in the same erosion solution.The smaller the particle size,the greater the cylinder compressive strength of the slag beads and the stronger the ability to bear pressure.The surface of slag beads is smooth and spherical,and the particle size is uniform.The content of amorphous phase of the slag beads is high because of the rapid cooling rate of the slag beads by gas quenching.When the slag beads sizes are less than 0.30 mm,the XRD curve becomes the shape of a teamed bread,showing that crystal phase is hardly precipitated and the minerals are amorphous.