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729

(1904) Author: Gustav Sundbärg
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Full resolution (JPEG) - On this page / på denna sida - Second part - IX. Mining Industry and Metal Production - 2. The Iron and Steel Industry. By the late Prof. J. G. Wiborgh - Wrought iron

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wrought iron.

729

After a little slag has been put into the hearth, it is filled with charcoal a
little above the height of the tuyeres, then the red hot pig iron is raked
ont of the heating chamber, placed in the charcoal, after which the blast is
applied and the melting of the pig iron is begun. In order to replenish the
charcoal consumed, fresh charcoal is thrown into the hearth from time to time,
while from an adjacent little reservoir small quantities of water are poured
over the charcoal with a dipper, partly to make the heat from the hearth less
annoying to the workmen, and partly to prevent the carbonic oxide from burning
before entering the preheating chamber.

Lavcashire hearth.

The charcoal ought also to be washed before being used, which is done by
first dumping it into a large watertank, from which it is then brought direct to the
hearth. The object of the washing is to clean the charcoal from sand and mud,
which, if allowed to remain, would increase the percentage of silicon in the slag
and cause a larger waste. The charcoal being wet is also advantageous, because
then less charcoal is consumed by air, which enters the hearth from the
working port.

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