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 Blue
Resources, Inc.
Leatherwood, Kentucky
Roberts & Schaefer Company performed the engineering, procurement
and construction of a 1,250 TPH preparation plant and coal handling
facility. This project was unique because of the extreme site
constraints, resulting from mountain terrain.
 Raw
coal was received from two truck dump areas that obtain coal from
two separate seams. A storage and reclaim facility for raw coal
was designed to permit coal blending from the two seams. The screening
and breaker station was provided to make a 6" x 0 product,
which is fed to the preparation plant. Raw coal is wet screened
with a combination of incline and pre-wet screens to make a 6
x 4" feed to a heavy medium low flow bath circuit. The ¼"
x 0 raw coal is partly deslimed over sieve bends and passed through
super-scalping units for refuse scalping ahead of the raw coal
cleaning circuit. The raw ¼" x 0 overflow from the
super-scalping circuit is screened in high refuse capacity double
deck Deister tables. The 28 mesh x raw coal is classified at approximately
100 mesh; the classifying cyclone underflow reports to a spiral
circuit. The cyclone overflow is delivered to the water clarification
circuit, which used a 120' diameter high capacity thickener.
The clean coal products and refuse products are mechanically
dewatered. A stoker product is made from the bottom deck of the
low-flow circuit clean coal screens. The primary rejects from
the low-flow circuit are rewashed in a secondary vessel. The clean
coal stoker and the middling product are collected and transported
to a series of open storage piles with transfer belts, gates,
and lowering tubes that effect complete flexibility for product
storage. The entire storage system is located over a common reclaim
tunnel, approximately half a mile high in length.
Vibrating feeders and intermediate belt scales allow for blending.
The reclaimed/blended coal is transported on a high capacity reclaim
belt to a loadout system. This loadout system is unique in that
it adds a separate system for stoker batch weighing, to the conventional
batch-weighing concept.
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