June 2016
|
World Coal
|
21
Classification in
coal preparation
Aaron Noble, West Virginia University
and Gerald H. Luttrell, Virginia Tech,
USA,
demonstrate why ultra-fine size
classification is an important part of
coal preparation and explain why it
should not be overlooked.
M
odern coal preparation plants use several
parallel cleaning circuits to remove inorganic
and noncombustible waste material from ROM
coal. The various cleaning units and separation
technologies are only effective for a narrow range of particle
sizes and, as a result, each parallel circuit is designed to treat a
single size fraction. For example, most modern coal
preparation plants in the US use dense medium vessels and
dense medium cyclones for particles greater than 1 mm,
