The use of overburden from the Korpanga deposit, Karelia, as quartz-feldspathic raw material

Abstract

The paper discusses the potential of leptite gneiss from the Korpanga iron deposit, Karelia, as a raw material for the production of facing ceramics. The properties of feldspar concentrate, produced by floto-magnetic enrichment of leptite gneiss, are described. It is shown that the use of the concentrate as additive for ceramics decreases roasting temperature and increases its strength.