Production of composite pellets from waste coffee grounds, mill scale and waste primary battery to produce ferromanganese; a zero waste approach

Abstract

This study was aimed to produce ferromanganese by using waste battery as manganese source, mill scale as iron source and waste coffee ground as reduction agent and carbon source. Waste batteries were collected from waste battery collection bins. Mill scale was collected from hot rolling workshop. Waste coffee grounds were household used coffee. All starting materials were characterized. Weighted raw materials blended with addition of bentonite as a binder. Pelletizing equipment was used to produce composite pellets. Produced pellets were dried then used for reduction experiments. Reduction experiments were conducted in Argon purged tube furnace for 1250 oC, 1300 oC and 1400 oC according to thermodynamic background. Produced ferromanganese samples were characterized for chemical compositions and metallization rate.