Method of manufacturing cement

Compositions: coating or plastic – Coating or plastic compositions – Proteinaceous material containing

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C04B 704, C04B 706

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048986151

ABSTRACT:
A novel method for manufacturing cement utilizing crushed refuse. The method comprises a first step of preparing a homogeneous powder mixture from a majority of crushed refuse substantially free of metal constituents and a minority of at least one first mineral material containing calcium oxide in the free or combined state. In a second step, the powder mixture is granulated under pressure. A third step comprises heat treating the granules at a temperature between 130.degree. C. and 230.degree. C. for a length of time sufficient to bring the water content of the granules to between about 0.1 and 1.0% by weight. The third step produces a refuse product. A fourth step comprises mixing the refuse product with a first starting mixture and firing the resulting clinker mixture in a kiln, producing a clinker. In the last step, gypsum is added to the clinker and the resulting cement mixture is crushed.

REFERENCES:
patent: 763685 (1904-06-01), Marsden
patent: 1004380 (1911-09-01), Daker
patent: 1627170 (1927-05-01), Gerlach
patent: 1731189 (1929-10-01), Bergquist
patent: 3600476 (1971-08-01), Suzuki
Henderson et al., Metallurgical Dictionary, 1983, p. 293.
Alsted-Nielsen et al., "Preparation des ciments aux cendres volantes", Ciments, Betons, platres, chaux, No. 1, pp. 36-41, (1981).

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