Sentence Examples with the word Hot blast

When, however, a hot blast is used on highly sulphuretted copper ores, a concentration of 8 of ore into i of matte is obtained, with a consumption of less than one-third the fuel which would be consumed in smelting the charge had the ore been previously calcined.

It is smelted raw with hot blast in cupola furnaces, the largest being 2 10 in.

In the other phase the cold blast, forced in at A, passes four times up and down, as shown by the unbroken arrows, and escapes as hot blast at B.

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The hot blast blowpipe of T.