Iron Pellets
Iron Pellets are a better feed for iron making as compared to other feeds due to its various benefits, which includes uniform size, high metallisation rate, increased permeability in blast furnace to optimise fuel consumption rate among others.
Description
Iron Pellets are spheres of typically 6-18 mm to be used as raw material for blast furnaces. They typically contain 64%-72% Fe and various additional material adjusting the chemical composition and the metallurgic properties of the pellets. The process of pelletizing combines mixing of the raw material, forming the pellet and a thermal treatment baking the soft raw pellet to hard spheres. The raw material is rolled into a ball, then fired in a kiln or in travelling grate to sinter the particles into a hard sphere. The configuration of iron ore pellets as packed spheres in the blast furnace allows air to flow between the pellets, decreasing the resistance to the air that flows up through the layers of material during the smelting. The configuration of iron ore powder in a blast furnace is more tightly-packed and restricts the air flow. This is the reason that iron ore is preferred in the form of pellets rather than in the form of finer particles.
Specification
| Chemical analysis(On dry basis) | Unit | Value | Tolerance |
|---|---|---|---|
| Fe | % | 65 | Minimum |
| FeO | % | 0.3 | Maximum |
| SiO2 + Al2O3 | % | 5 | Maximum |
| CaO | % | 0.03 | ± 0.01 |
| MgO | % | 0.06 | ± 0.01 |
| Basicity | % | 65 | Maximum |
| Phosphorus | % | 0.05 | Maximum |
| Physical properties | |||
| Bulk Density | t/Cum | 2.2 | ± 0.2 |
| Tumbler Index | % | 93 | Minimum |
| Abrasion Index | % | 3 | Min ± 0.5 % |
| Cold Crushing Strength (Avg) | Kg/P | 250 | Minimum |
| Size analysis | |||
| 8 - 16 mm | 94 | Minimum | |
| -5 mm | % | 2 | Maximum |
| +16 mm | % | 4 | Maximum |
| Metallurgical properties | |||
| Porosity | % | 18 | Minimum |
| Reducibility | % | 62 | Minimum\ |
Grade / Size / Packing: As per customer’s request.