Effect of alkalis on reduction behavior of acid iron ore pellets.

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Under conditions relevant to the process of an iron blast furnace with alkali cycling, acid iron ore pellets were tested. The alkalis were introduced in three different ways: as part of the pellets gangue phase, as fine crystals of alkali carbonates near the pellets surface, and, as metal vapor mixed with the reducing gas.<br>During reduction alkalis flux the silicate binding bridges and react with ferrous iron oxide forming low melting point slag which weakens the pellets and causes them to degrade. A mechanism of degradation will be given which relates the behavior of the pellets to the formation of this primary slag. Also, certain measures to control the reduction will be discussed.

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