(f) Finished product storage area.
A mill complex will usually end in a
finished product storage area.
(g) Controlled cooling warehouse. Some special products such as structural
steel and railway rails, require controlled cooling conditions to minimize
distortion from contraction.
A controlled cooling warehouse will be present to
accommodate such products. It can be recognized by its large roofed monitors and
vents which allow good ventilation.
f. The charge for a blast furnace consists of coke, iron ore, limestone, air,
and water used as a cooling agent.
The layering yard and roasting and sintering
areas are involved in the preparation of iron ore, limestone, and coke prior to it
being charged into the blast furnace (Figure 2-68).
Figure 2-68. Preparation for the Blast Furnace (Layering Yard).
(1) Various grades of iron ore, which have been previously crushed, are mixed
in the layering yard prior to roasting and sintering. Coke dust may also be added
at the sintering stage.
(2) Limestone is prepared for the blast furnace by either slacking or
Both processes are rare at a steel plant, lime preparation normally
being accomplished at the mine site.
(3) All these processes are optional and will not be seen at all coke, iron,
and steel works.
Layering is only required where various grades of ore are used
and mixed. Roasting is used to remove impurities from low grade ores and sintering
to form ore and coke fins Into clinker or sinter as a preparation for the blast