Cast
iron is an alloy of iron with carbon, containing more than 2% C. The ore freed
from gangue is a chemical compound of metal with other elements. In order to
obtain the metal from the ore, it is necessary to carry out certain chemical
reactions. At the same time, the elements connected to the metal are affected
by substances having a lower affinity with it than with other elements.
Since
in iron ores iron is usually in combination with oxygen, it is necessary to
carry out regenerative processes to produce this metal. In its pure form, iron
in technology is used in very small quantities. In general, only in the
engineering industry, alloys of iron and carbon are required. One such alloy is
cast iron.The Iron Work Burnaby offers best cast iron
works.
Blast furnace
Cast
iron from iron ore is produced in blast furnaces. These furnaces have the form
of towers (shaft furnaces). The inner parts of the blast furnace are laid with
refractory fireclay bricks.
Shihta,
i.e., ore, fuel and flux, is fed from the hopper by a lift 1 into the
backfilling apparatus of the top 2, from where it enters the internal cavity of
the furnace. The furnace has a shaft 4, a vapor 5, shoulder 8,and a hearth 9,
the bottom of which is called a bream. The output of molten iron is produced
through a hole - a cast iron tap, above which there is a slag tap, through
which liquid slag is discharged.
The
air necessary for the production of cast iron is blown under pressure in the
preheated state (up to 1200 ° C) into the lances 7 (12-18 pieces), passing
along the annular pipe 6 located above [the air pressure at the tuyeres to 350
kn / m2 (3 , 5 kg / cm 2 )]. Blast furnace gas is discharged through pipes 3 to
purification devices, since it is further used as fuel for the needs of blast
furnace production and other purposes at the Iron Work Delta factories.
