443
OF ENGINEERING FOBMVLÆ.
Steel Manufactube—continued.
The furnace is lined with gannister, a species of millstone
grit; it is oval, about 2 ft. X 1 ft. 6 in., and 3 ft. 9 in. high.
The passage leading from the furnace to the chimney flue is
9 in. X 9. The crucibles are generally of fire-clay, holding
from 55 to 70 lbs. for the first charge, and 5 or 10 lbs. less
each time they are refined. Three charges are melted in
12 hours, with a consumption of to 3f of coke (equivalent
to 4 or 5 tons of coal) per ton of steel melted.
POT-STEEL MELTING HOM.
REGENERATIVE GAS
POT-STEEL MELTING Ft’KNACK.
The regenerative gas furnace effects a considerable saving
in fuel, requiring from 22 to 30 cwt. of small coal per ton of
metal melted.
The melting chamber in the regenerative gas furnace is
a long trench divided by cross walls into chambers, each
holding 6 pots arranged in two rows.
In America, plumbago crucibles are used having a capacity
of 1 cwt. Each pot lasts about 24 hours, yielding 5 charges
with a consumption of 1 ton of small coal per ton of metal
produced.
Bessemeb 5-ton Convektek.