Carbon Cycle in A Steelmaking Mill: Recycling of Kish Graphite and Its Subsequent Application for Steelmaking Carburant

Abstract

Abstract The reclamation management of the solid waste produced by iron and steel enterprises is an urgent problem. The recycling and utilization of kish graphite associated with steel slag are of great significance to achieve a circular economy and environmental protection. This study explored a recycling process that combined gravity separation and flotation, and the feasibility of carburant preparation from kish graphite was determined. During the recycling process, the concentrate of a teeter bed separator went into a flotation tank, then the rougher flotation concentrate was re-ground four times and underwent cleaning flotation five times. The final concentrate held a yield of 20.28%, a grade of 94.85%, and a recovery rate of 95.32% and a kish-graphite-based carburant was prepared. The results indicated that recycling the kish graphite from steelmaking slag with a gravity-flotation process and using it as a carburant for steelmaking is a feasible route for its resource utilisation and an effective carbon emission reduction technology.