Conclusions
The periclase in chrome-magnesite containing iron oxides in its composition in the form of solid solutions secretes them during service in the sintering zone of rotary kilns, becomes lighter, recrystallizes, increasing in size through the intergrowth of several neighboring grains within the aggregates. The longer the refractory remains in the furnace, the more marked this effect.
It is incorrect to transfer mechanically the metallurgical explanation of the brown fringe on the periclase aggregates and consider it to be a sign of their saturation with iron oxide.
The recrystallization of the periclase is a positive factor furthering the service life of the refractory.
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Sharafiyev, M.S., Orlova, G.V. Periclase in chrome-magnesite lining of rotary kiln for firing cement clinker. Refractories 3, 111–112 (1962). https://doi.org/10.1007/BF01293167
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DOI: https://doi.org/10.1007/BF01293167