高炉水砕スラグからのカオリナイトの水熱合成

概要

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Water quenched blast furnace slag was examined as raw material for the hydrothermal synthesis of kaolinite at 220℃. Kaolinite could not be obtained from the raw slag with a lower polycondensation state of unhydrated silica nor from the annealed slag with gehlenite-structure. The HCl-treatment of the slag successively makes hydration and polycondensation of the silica so as to form a silica-gel consisting of hydrated silanol and unhydrated silica. The obtained silica-gel reacts with aluminum hydroxide under the hydrothermal condition to form kaolinite with bohmite. The uses of acidic solutions as the hydrothermal liquids can improve the formation of kaolinite. Spherical kaolinite was dominantly formed with the reaction in the H_2SO_4-solution, whereas platy kaolinite was crystallized in the HNO_3-solution.
日本粘土学会の論文
1994-07-07