Augmentation of Clean Coal from accumulated/fresh

slurry of different washeries of BCCL/CCL for

metallurgical purposes.

DR KALYAN SENDirector,CFRI

10-12 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.

ConstraintsHigh ash (25 – 35%)

Coal fines contain lot(25-45%) of ultrafines(<45 micron)

Failure of conventional recovery processes.

ScopeMore 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) finesTotal 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 onlyAccumulated fines at BCCL

46,00000 t

Recovery by CFRI Processat less than 15 % ash

23,00000 t

Cost of beneficiated concentrated (Rs/t)

2477.00

Market price (Rs/t) 3000.00

Value addition Rs 120 crore

OTHER BENFITS

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