Preparation of High Strength Coke from Indonesian Lignite by Deeply Pulverized

Abstract

Coke production from lignite was studied as a continuation of research showing the effectiveness of a sequence of hot briquettes and carbonization on preparations high strength coke from Indonesian lignite. The hot briquetting and carbonization cokes from three Indonesian lignites with a deeply pulverized. Ball milling carried out for 10 hours and 20 hours to obtain a small particle size. Raw lignite hot briquettes at mechanical pressure and temperature of 128 MPa and 200 °C, respectively, allowed cokes to be produced with a tensile strength (TS) of 7-11 MPa. Pretreatment, 10 hour and 20 hour ball milling, respectively increasing TS from the resulting coke to 15-23 and 19-36 MPa. Moreover, it is proved in this study that the structure on the coke fracture has a smooth texture and solid with less pore. There is a strong correlation between TS and coke density of individual lignites.