H - Electricity – 05 – B
Patent
H - Electricity
05
B
307/15
H05B 6/20 (2006.01) C04B 35/10 (2006.01) C04B 35/101 (2006.01) C04B 35/66 (2006.01) F27D 1/00 (2006.01)
Patent
CA 1263882
A B S T R A C T An improved refractory inductor block is provided for channel induction furnaces for melting aluminum com- prising a hearth and an inductor. The improvement comprises casting the refractory inductor block from a refractory resistant to corrosion by molten aluminum comprising 9.5 to 40 wt.% calcium aluminate, 0.5 to 10 wt.% of a borosilicate frit, and 60 to 90 wt.% of an aggregate consisting of an alumina-bearing compound, a silica-bearing compound or mixtures thereof. The refractory is cast around a solid core pattern made from a material capable of desolidifying upon the application of heat, such as a wax pattern. The channel core pattern is shaped to provide the desired channels within the refractory inductor block. After formation of the green refractory, the mold material, such as wax, may be melted off and the refractory cured by firing at a temperature of from 760 to 871°C. (1400 to 1600°F.), preferably about 815.5°C (1500°F.), for from 5 to 20 hours and preferably about 6 hours. To ensure temperature uniformity during firing, the temperature is slowly raised from ambient up to the firing temperature at a rate of up to 5.6°C; (10°F,) per hour.
495247
Hammersmith Virginia L.
Ormesher Robert J.
Aluminum Company Of America
Gowling Lafleur Henderson Llp
Hammersmith Virginia L.
Ormesher Robert J.
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