1.Introduction:
Ferrochrome (FeCr) is an alloy of chromium and iron containing
between *0% and *0% chromium.
The ferrochrome is produced by electric arc melting of chromites,
an iron magnesium chromium oxide and the most important chromium
ore. Most of the world's ferrochrome is produced in South Africa,
Kazakhstan and India, which have large domestic chromites
resources. Increasing amounts comes from Russia and China.
2. Usage:
Over *0% of the world's ferrochrome is utilised in the production
of stainless steel. In ***6 *8 Mt of stainless steel were produced.
Stainless steel depends on chromium for its appearance and its
resistance to corrosion. The average chrome content in stainless
steel is approximately *8%. It is also used when it is desired to
add chromium to carbon steel. FeCr from Southern Africa, known as
'charge chrome' and produced from a Cr containing ore with a low Cr
content, is most commonly used in stainless steel production.
Alternatively, High Carbon FeCr produced from high grade ore found
in Kazakhstan (among other places) is more commonly used in
specialist applications such as engineering steels where a high Cr
to Fe ratio and minimum levels of other elements such as Sulfur,
Phosphorus and Titanium are important and production of finished
metals takes place in small electric arc furnaces compared to large
scale blast furnaces.
3. Production
Ferrochrome production is essentially a carbothermic reduction
operation taking place at high temperatures. Cr Ore (an oxide of
chromium and iron) is reduced by coal and coke to form the
iron-chromium alloy. The heat for this reaction can come from
several forms, but typically from the electric arc formed between
the tips of the electrodes in the bottom of the furnace and the
furnace hearth. This arc creates temperatures of about ***0°C. In
the process of smelting, huge amounts of electricity are consumed
making production in countries with high power charges very
costly.
Tapping of the material from the furnace takes place
intermittently. When enough smelted ferrochrome has accumulated in
the hearth of the furnace, the tap hole is drilled open and a
stream of molten metal and slag rushes down a trough into a chill
or ladle. The ferrochrome solidifies in large castings, which is
crushed for sale or further processed.
Ferrochrome is often classified by the amount of carbon and chrome
it contains. The vast majority of FeCr produced is charge chrome
from Southern Africa. With high carbon being the second largest
segment followed by the smaller sectors of low carbon and
intermediate carbon material.
4. Specification:
|
Product
|
Chemical compositon(%)
|
|
|
Size
|
|
Cr
|
C
|
Si
|
P
|
S
|
****0mm
*****0mm,
***0mm
****0mm
|
|
≥
|
≤
|
|
Ferro Chrome
|
*0
|
8
|
2&4
|
0.*4
|
0.*4
|
|
*0
|
1.5
|
2
|
0.*4
|
0.*3
|
|
*5
|
2
|
3
|
0.*5
|
0.*4
|
|
*0
|
0.*3&0.1
|
1
|
0.*4
|
0.*3
|
|
Package
|
in 1mt big bag or according to customer's need
|
