Augmentation of Clean Coal from accumulated/fresh slurry of different washeries of BCCL/CCL for metallurgical purposes. DR KALYAN SEN Director,CFRI

 million tonnes of coking coal is being washed every year to produce clean coal for steel making. INTRODUCTION  15-20% of coal input is screened out as fines (-0.5 mm).  Hardly 20-25% is recovered by existing slurry treatment circuits.

Constraints  High ash (25 – 35%)  Coal fines contain lot(25-45%) of ultrafines(<45 micron)  Failure of conventional recovery processes.

Scope More than 4.6 million coal slurry is already accumulated as waste in BCCL area. Equal amount may be impounded in CCL. In addition to that 0.5 million tonne fresh slurry is produced and impounded every year.

CFRI’S View Utilization of waste slurry for steel making purpose thru froth flotation (patented) techniques, developed and commercialized by CFRI.

Mini Flotation Plant(5-12 tph)  A few mini flotation plants( total 40t/h) are already available to upgrade the accumulated(4.6 M t) and fresh (0.5 Mt/yr) fines  Total capital invested for 40 tph capacity building is around Rs 3 crore.  Possibility of installing additional capacity (say 50tph in 6 months at a cost of Rs 2 crore)

Benefit on accumulated slurry only Accumulated fines at BCCL 46,00000 t Recovery by CFRI Process at less than 15 % ash 23,00000 t Cost of beneficiated concentrated (Rs/t) Market price (Rs/t) Value additionRs 120 crore

OTHER BENFITS  Reduction of import of high quality coking coal to substantial extent, which leads to savings of foreign exchange and energy security  Increasing the qualitative yield of clean coal from the existing washeries  Utilization of waste and effluents.  Pollution free environment  Encouragement of National Award Winning Process in core sector…