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Abstract

There is provided a method of preparing silica (SiO.sub.2) nanoparticles from siliceous mudstone which is silica mineral sources, using a chemical reaction. The method of preparing silica nanoparticles from siliceous mudstone comprises: solving a silica constituent into a sodium silicate aqueous solution by a sodium hydroxide leaching reaction of the siliceous mudstone (S100); performing ion exchange to remove a sodium constituent from the sodium silicate aqueous solution and to prepare a silicate aqueous solution (S200); and performing flame spray pyrolysis to prepare silica nanoparticles with an average particle dimension being in a range of 9 to 57 nm from the silicate aqueous solution. The present invention provides the method of preparing nanoparticles from siliceous mudstone by preparing the silicate aqueous solution from the siliceous mudstone by the chemical reaction and ion exchange process, and spraying the silicate aqueous solution being aerosolized and injecting generated liquid droplets of the solution into a flame reactor.

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