PURPOSE: To obtain a porous glass filler with an average particle size of 0.1W30μm, by applying heat treatment to soda glass comprising a three- component system of SiO2/B2O3/Na2O to perform phase splitting thereof and, after coarse grinding and acid elution treatment, performing finely grinding operation and classification operation.
CONSTITUTION: A stock mixture, wherein SiO2=60.3%, B2O3=30% and Na2O=9.7%, is melted under heating and, after quenched to room temp., subjected to phase splitting by heat treatment. Next, thus obtained glass is coarsely ground so as to obtain a particle size of 50μm or more and successively subjected to the adjustment of a particle size and acid elution treatment to obtain porous glass. Subsequently, this porous glass is finely ground by an impact type pin mill while pneumatic classification is applied to the finely ground one and elutriation classification is further applied thereto. By this method, because porous glass fine particles can be prepared by selecting an average particle size in an arbitrary size within arrange of 0.1W30μm, said fine particles are suitable as the porous glass filler for high performance chromatography.
MURAKAMI YUKIO
TAGUCHI YOICHI
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