利用内衬聚氨酯搅拌磨制备高纯超细SiO_2微粉的研究

Study on preparation for high-purity superfine SiO_2 micro powders by agitator mill with polyurethane lining

以高硬度的钇稳定氧化锆球为研磨介质,对内衬聚氨酯的搅拌磨制备高纯超细SiO2微粉的可行性进行了研究,并研究了SiO_3微粉粒径特征参数D_(50)随搅拌粉磨时间延长的变化规律,考察了钇稳定氧化锆球对SiO_3微粉的污染程度,探讨了1μm以下SiO_2微粉的形貌特征。结果表明:用该搅拌磨磨细石英粉并经过沉降分级,可获得SiO_2含量为99.91%、粒径为1μm以下的高纯超细SiO_2微粉,不经分级可以获得SiO_2含量为99.99%、粒径为61.5μm以下的SiO_2微粉,但难以获得球形SiO_2微粉;钇稳定氧化锆球对SiO_2微粉的污染程度小,磨损带进的ZrO_2杂质仅含0.0246%,带进的Y_2O_3杂质为0.0014%。

Taking the high-hardness yttria-stabilized zirconia balls as grinding medium, the paper analyzes the feasibility preparation for high-purity superfine SiO2 micro powders by agitator mill with polyurethane lining, studies on the changing regulations of the grain-diameter characteristic parameter D50 of SiO2 micro powders with the grinding time expanding, researches on the contamination degree of yttria-stabilized zirconia balls on the micro powers, and discusses the patterns of SiO2 micro powers with the size below 1μm. The result shows that the quartz powers obtained by the method can acquire high-purity superfine powders with 99.91% SiO2 and the size below 1μm through the classification of sedimentation; without classification, it can acquire powders with 99.99% SiO2 and the size below 61.5μm but not spherical SiO2 powders; yttria-stabilized zirconia balls characterizes the light contamination on SiO2 micro powders, and there is 0.0246% ZrO2 and 0.0014% Y2O3 as impurity during grinding.