Washability assessment of Indian coking coal for optimized beneficiation and sustainable utilization

The characterization of coal is fundamental prerequisite for designing
washing circuits and achieving optimal utilization of cleaned coal
products. Unlike traditional approaches, this research employs
a particle size-specific washability analysis, providing a novel approach
to improving coal beneficiation processes. Using Indian coking coal as
a case study, the research evaluates washability characteristics across
various size fractions utilizing advanced washability parameters such
as Optimum Degree of Washability (ODW), Washability Number (WN),
Index of Washability (IW), and Near Gravity Material Index (NGMI).
Results reveal that smaller particle sizes enhance washability, with
consistent ODW values suggesting uniform characteristics across
sizes. Variations in WN and IW imply that finer fractions exhibit greater
cleaning potential, while NGMI highlights the challenges associated
with washing these finer particles. Key findings include achieving low
ash content (<18%) at a specific gravity of 1.65, rendering the coal
suitable for metallurgical applications. The comparison of washability
parameters provides a comprehensive understanding of coal suitability
for beneficiation processes and its potential to yield low ash content
in cleaned coal products. These insights are pivotal for optimizing
coal beneficiation processes and promoting sustainable and efficient
utilization of Indian coking coal in the metallurgical industry.