摘要：为优化电熔法生产氧化锆过程副产物硅灰 (DR-GH) 加工技术、提高其利用价值, 采用粒度分布测试、扫描电子显微镜 (SEM) 和透射电子显微镜 (TEM) 观察, 并结合化学元素、X射线衍射 (XRD) 分析、DR-GH水悬浮液搅拌手段, 对DR-GH的化学成分、物相组成、颗粒特性进行研究。结果表明, DR-GH主要由无定形SiO₂实心体微球和少量ZrO₂粒子组成, SiO₂微球原级粒径为0.5～3μm, 彼此间先聚集形成结合力强的二次颗粒, 再由二次颗粒凝聚成结合力较弱的SiO₂团聚体。对DR-GH水悬浮液搅拌可使SiO₂团聚体解聚至二次颗粒尺度, 其粒度d₉₀由18.551μm降至5.379μm, d₅₀由2.582μm降至1.88μm。

关键词：硅灰；无定形 SiO₂；颗粒解聚

Abstract：For optimizing the processing technology of by-product DR-GH during the production of electric smelting zirconia and increasing utilization value of DR-GH, the chemical composition, phase composition and particle characteristics of DR-GH were studied through particle size distribution testing, scanning electron microscope (SEM) and transmission electron microscope (TEM) observing combining with the analyzing of chemical elements and X-ray diffraction (XRD) .The results show that the DR-GH is composed of amorphous SiO₂ solid sphere and a few ZrO₂ particles.The diameter of SiO₂ primary particle is0.5～3μm, and the primary particles first aggregate to form secondary particles with strong binding force.The secondary particles agglomerate into a weakly bound SiO₂ agglomerate.The SiO₂ secondary particles can be obtained by stirring the DR-GH suspension, of which the d₉₀of DR-GH dropped from 18.551μm to 5.379μm and the d₅₀dropped from 2.582μm to 1.88μm.

Keywords：silica fume；amorphous SiO₂；particle characteristics