B - Operations – Transporting – 22 – C
Patent
B - Operations, Transporting
22
C
6/45
B22C 1/00 (2006.01) B22C 1/18 (2006.01) C04B 35/02 (1980.01)
Patent
CA 1190004
CEMENT FOR THE MANUFACTURE OF CORES AND MOULDS AND METHOD FOR PREPARING SAME A b s t r a c t The cement of the invention comprises chemically combin- ed oxides, per cent by mass: CaO, 50 to 60; Al2O3, 28 to 37; Fe2O3, 0.01 to 1; SiO2, 0.1 to 8; Na2O, 0.1 to 1; K2O, 0.1 to 0.5; H2O9 3 to 12; and incorporates85 to 99% by mass of a fraction with a particle size of below 80 µm and 1 to 15% by mass of a fraction with a particle size of from 80 to 200 µm. The cement can also contain one or more additive: calcium oxide or calcium hydroxide, calcium carbonate, cal- cium carboaluminate. The method according to the invention for preparing said cement comprises a heat-treatment of calcium hydroalumosili- cate containing SiO2 in an amount of not more than 8% by mass at a temperature of from 250 to 600°C. The heat-treated product is disintegrated to produce 85 to 99% by mass of a fraction with a particle size of below 80 µm and 1 to 15% of a fraction with a particle size of from 80 to 200 µm. During the heat-treatment of the hydroalumosilicate it can be added with at least one component: calcium oxide or calcium hydroxide, calcium carbonate; calcium carboalumninate. The cement is useful in foundry engineering for the ma- nufacture of articles from ferrous and non-ferrous metals.
427363
Alexeev Alexei I.
Andreev Vladimir V.
Badaliants Khoren A.
Kaluzhsky Nikolai A.
Korneev Valentin I.
Leningradsky Tekhnologichesky Institut Imeni Lensoveta
Ogilvy Renault
Vsesojuzny Nauchno-Issledovatelsky I. Proektny Institut Aljumini Mag Nievoi I. Elektrodnoi Promyshlennosti
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