Iron Ore Pelletizing

 

 

 

Pelletizing is the kind of process which is compressing or molding a material into the shape of a pellet. Iron ore is one of the vast ranges of different materials which are pelletized.
Iron ore pellets are like the spheres which their size typically between 8–18 mm (0.31–0.71 in). They are as raw material for blast furnaces. They typically contain 67%-72% Fe and various additional materials adjusting the chemical composition and the metallurgic properties of the pellets.
 In this process, mixing of the raw material are combines, the pellets are forms and bakes the soft raw spheres pellets to the hard ones.
It is preferred to use the iron ore pellets rather than in the form of finer particles since, in shaping and arranging the iron ore pellets, a packed sphere in the blast furnace allows air to flow between the pellets, reducing the resistance to the air that flows up through the layers of material during the smelting. However, in the configuration of iron ore powder in a blast furnace is more tightly-packed and restricts the air flow, thus which is the reason.

Supplying of raw materials:

For preparing the final pellets, other materials are added to the iron ore. This activity is done by placing the mixture in the pelletizer. It can hold different kinds of ores and additives, and mixing to adjust the chemical composition and the metallurgic properties of the pellets.
In general, this period of processing has the following stages: concentration / separation, homogenization of the substance ratios, milling, and classification, increasing thickness, homogenization of the pulp and filtering.


Formation of the raw pellets

In formation of raw pellets, both mechanical force and thermal processes are used. From equipment point of view there two alternatives for industrial production of iron ore pellets to produce the correct pellet properties: drum and pelletizing disk.
Disc Pelletize the formation of raw iron ore pellets, also known as pelletizing. It has the purpose of producing pellets in an appropriate band of sizes and with mechanical properties high usefulness during the stresses of transference, transport, and use.  


Thermal processing:

The pellets are subjected to thermal processing, in order to give the pellets high resistance metallurgic mechanics and appropriate characteristics. This process consist several stages as: drying, daily pay burn, burn, after-burn and cooling (in a cooling tower). The duration of each stage and the temperature are that the pellets subjected to have a strong influence on the final product quality.