An investigation into ash-ring formation in a rotary lime kiln

This paper describes an investigation into the nature of an ash-ring formed in a coal-fired lime kiln. Apart from various cementitious phases identified in the ash-ring, evidence was found that various liquid compounds were formed during the ash-ring build-up. It was concluded that these phases, together with the discovery that the ash-ring reacted to a significant extent with the brick lining of the kiln, caused the ash-ring formation in this particular case.