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AssigneeCDEM Holland, B. V.
InventorsJoseph Jan Peter Biermann, Robert Bleijerveld, Nicolaas Voogt, Hendrik Jacobus Hulscher
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A method of making a hydraulic material which contains metakaolinite and calcium hydroxide from a kaolin-containing compound. The method is performed in a fluidized bed installation having a freeboard under conditions such that the amount of calcium oxide formed is minimized. Preferably, the method is performed at a fluidized bed temperature of 780.degree. C. and a freeboard temperature of no more than 780.degree. C. By minimizing the amount of calcium hydroxide formed, the use of an additional installation for converting calcium oxide to calcium hydroxide is avoided. The starting material is typically waste paper and other residues from recycling of waste paper for reuse in the paper industry. The product may be used to form concrete having a high compression strength.
A method for the thermal conversion of kaolin-containing material to a meta-kaolin containing material comprising treating the kaolin-containing material thermally in a fluidized bed installation having a freeboard in the presence of oxvgenous gas wherein the kaolin-containing material used is waste paper or residues that stem from recycling waste paper for reuse in the paper industry, and the fluidized bed is operated at a temperature between 720.degree. C. and 850.degree. C. and the temperature of the freeboard is 850.degree. C. or lower and the fluidized bed is provided with means for promoting heat transfer.
Dependencies are inferred from the claim text.