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 - Fuel
<< prev. page << föreg. sida << >> nästa sida >> next page >>
Below is the raw OCR text
from the above scanned image.
Do you see an error? Proofread the page now!
Här nedan syns maskintolkade texten från faksimilbilden ovan.
Ser du något fel? Korrekturläs sidan nu!
This page has never been proofread. / Denna sida har aldrig korrekturlästs.
712- ix. mining industry and metal production op sweden.
When the burning is completed, the charcoal is taken out a little at the
time, care being taken to sprinkle the charcoal in case it, when exposed to the
air, should catch fire, and the charcoal is collected in a ring around the bottom
of the stack.
The charcoal ought to be left in this way at least eight days in order to
avoid danger of catching fire when transported into the storage-house; it is often
collected in a heap, close to the bottom of the stack, and is then covered and
kept there until the road allows transporting it.
An ordinary stack is 15 meter in diameter, and is burnt in four weeks.
From 30 hectoliters of wood piled in the stack, one »stig» — 20 hectoliters —
of charcoal is produced.
Charcoal stack after burning.
During the piling and raking out, as well as during the first week of the
burning, 2 men are required, but during the remaining time only one.
Horizontal stack. The bottom of this stack is rectangular, the length of
the wood 6 to 7 meters, and it is piled in such way that the length of the wood
measures the width of the stack. The stack is covered with spruce-twigs and
sand, after which the charring is conducted on the same principle as for the
vertical stack.
Charring in kilnB is practised only at a few iron works. The kilns, bnilt
of common bricks, are of a very simple design. Their capacity is 2,600 cubic
meter, their shape a parallelopiped with arched roof and brick bottom. Below
the bottom is one or two fireplaces, from which the gases by means of channels
enter into the wood through 4 to 5 openings in the bottom. By means of the
gases the water is expelled, the wood dried and charred, and the gases escaping
from the furnace are pulled out at the bottom of the furnace by means of draught
<< prev. page << föreg. sida << >> nästa sida >> next page >>
