OCL India Limited offers Slag Cleaning Furnace. OCL India Limited is an ISO 9001:2000 awarded company. OCL India Limited offers different types of ovens, furnace stoves, hot metal mixer, electric air furnace, slide plate etc. Copper rich oxide slags are melted in Slag Cleaning Furnace where coke and copper pyrite are added to reduce the copper content in the slag. In order to increase the reaction rate the slag are over heated producing low viscosity aggressive slag.