Fuel, Vol.186, 320-327, 2016
Attempts to produce blast furnace coke from Victorian brown coal. 4. Low surface area char from alkali treated brown coal
A Victorian brown coal (VBC) has been heated with strong aqueous KOH under severe conditions, neutralized with dilute H2SO4 and then hot-briquetted with or without coking coal tar pitch as a binder, optionally air cured and finally carbonized. The final products were evaluated as a blast furnace (BF) coke substitute. The least reactive final product had a much lower reactivity than the product obtained by carbonizing a hot-briquetted VBC-VBC tar mixture. Furthermore, the final product obtained from alkali treated coal had a surface area as low as that of a BF coke. However, the reactivity remained higher and the amount of graphitic structure lower than those of a BF coke. In addition, although the coal/coal-binder mixture, like coking coal, appeared to have fused during carbonization, the final products had virtually no meso + macropore volume, in contrast to a typical BF coke. (C) 2016 Elsevier Ltd. All rights reserved.
Keywords:Blast furnace coke;Brown coal;Alkali treatment;Coke strength and reactivity;Surface area and pore volume and graphitic structure