banner-1 Hon. Minister of Steel Sh. Narendra Singh Tomar
माननीय इस्पात मंत्री, श्री नरेंद्र सिंह तोमर
banner-1 Hon. Prime Minister of India
भारत के माननीय प्रधानमंत्री जी
banner-1 Hon. Minister of State for Steel Sh. Vishnu Deo Sai
माननीय राज्य इस्पात मंत्री, श्री विष्णु देव साई

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Pellets

Pellets

First, moistened concentrates are fed to a rotating drum or an inclined disc, the tumbling action of which produces soft, spherical agglomerates. These “green” balls are then dried and hardened by firing in air to a temperature in the range of 1,250° to 1,340° C (2,300° to 2,440° F). Finally, they are slowly cooled. Finished pellets are round and have diameters of 10 to 15 millimeters, making them almost the ideal shape for the blast furnace.
The earliest kind of firing equipment was the shaft furnace. This was followed by the grate-kiln and the traveling grate, which together account for more than 90 percent of world pellet output. In shaft furnaces the charge moves down by gravity and is heated by a counterflow of hot combustion gases, but the grate-kiln system combines a horizontal traveling grate with a rotating kiln and a cooler so that drying, firing, and cooling are performed separately. In the traveling-grate process, pellets are charged at one end and dried, preheated, fired, and cooled as they are carried through successive sections of the equipment before exiting at the other end. Traveling grates and grate-kilns have similar capacities, and up to five million tons of pellets can be made in one unit annually.