(57) This application discloses exemplary processes and systems for reducing mineral ring accumulation in calcination kiln. The processes and systems comprise inserting non-condensable gases ("NCGs") in a preheating zone of a calcination kiln, upstream of the burner end. The pre-heating zone may be characterized by temperatures ranging from 1300℉ to 1750℉. The system may desirably comprise a plenum for inserting the NCGs into the rotating calcination kiln at the pre-heating zone.
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