|
Sections |
Our product |
The chemical and
physical characteristics |
|
|
 Venprecar
briquettes are produced by reducing iron ore (pellets and
lumps) in a single reactor with a counter current reducing
gas. Due to their high density and metallization, low gangue
and residual content, and inert character, Venprecar HBI is
the ideal metallic charge for steelmaking.
Physical and chemical specifications of Venprecar HBI make a
superior product for the merchant HBI/DRI market, as a
result of a low level of fines generated during
transportation and handling, as well as less gangue, higher
carbon, and higher metallization than that found in other
HBI/DRI products. |
|
Chemical Analysis |
| Total Fe |
91.5 % min |
|
Metallic Fe |
85.5 % min |
|
Metallization |
93.0 % min |
|
C |
1.5 % min |
| P |
0.09 % max |
|
S |
0.003 % max |
| SiO2 (Silice) |
1.9 % max |
|
MgO |
0.5 % max |
| CaO |
0.9 % max |
|
Al2O3 (Alumina) |
1.1 % max |
Gangue (CaO+MgO+
SiO2+Al2O3) |
4.4 % max |
|
Residual
elements |
Traces |
|
| |
|
Physical analysis |
| Size |
108 x 48 x
32 mm |
|
Weight |
0.5 - 0.7 Kgs |
| Bulk Density |
2.6 - 2.8
ton/M3 |
|
Apparent
density |
> 5.0 g / cm3 |
|
Granulometric distribution |
>4 mm :
98%
<4 mm : 2% |
|
Moisture |
0.5% max. |
|
|
|
Specific
Applications |
|
Use in Electric Arc Furnaces |
 Due
to their high density, Venprecar briquettes can
be used as an alternative metallic source by either
charging in buckets (batch charging) or continuous
feeding through the roof. By charging in buckets, it
is possible to reduce the number of back-charges
since briquettes are much denser than scrap. Up to
40% briquettes can be used when charging in buckets.
In continuous feeding, briquettes are more effective
than DRI due to their high density, which allows
them to penetrate to the slag/metal interface
quickly rather than hang up in the slag. It is
possible to continuously charge up to 100%
briquettes. One of the meltshops in the SIDETUR
group, Casima, uses an 85% briquette practice. By
continuous feeding, all back-charges can be
eliminated, which reduces tap to tap time and heat
losses due to swinging the roof. This results in a
more constant power input, which reduces line losses
and improves productivity. Because of the low
residual content of the briquettes, they are in
increased demand for the production of higher
quality steels. |
| |
|
Use in Ladle Furnaces |
 The
low residual content, compact shape, and high
thermal conductivity make briquettes attractive as a
coolant for liquid steel in ladle furnaces. |
| |
|
Use in BOF |
 The
Venprecar HBI are used as a replacement for oxide
pellets as coolant in BOFS to increase hot metal
production. Up to 5% briquettes have been used as
coolant in large BOF shops. They can also be used as
a trim coolant in ladles. HBI has been used in BOFs
as a high quality low residual scrap substitute with
excellent results. |
| |
|
Use in Blast Furnaces |
 Using
the Venprecar HBI in the burden of blast furnaces
allows the productivity to be increased and reduces
coke consumption. |
| |
|
Other uses |
|
The Venprecar HBI are used in smaller quantities
in cupolas with good results. Briquettes with up to
3% carbon are being used with excellent results in
EAF shops. |
|
|