Iron processing - Ores | Britannica

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.

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