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St. James Parish, Louisiana
Roberts & Schaefer provided engineering, procurement, startup,
and construction services for this facility, which handles materials
including coal, Pet coke, Met coke, iron ore pellets, and DRI. The
facility moves iron ore pellets to the nearby DRI processing facility,
which then conveys the processed DRI back to the handling facility,
where it is loaded onto oceangoing vessels, river barges, or trains.
The project consisted of the following six major systems:
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A travelling grab unloader, which unloads river barges
or oceangoing vessels at a rate of 3,000 tph, either
to a travelling stacker for storage, or directly to the
DRI processing facility.
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A travelling ship loader, to load oceangoing vessels
with DRI (at a rate of 1,100 tph) Pet coke (at 1,100
tph), or coal (at 2,000 tph).
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A barge loader (supplied by R&S), to load river
barges with DRI (at 1,100 tph) or coal (at 1,700 tph).
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A rotary car dumper, to unload coal (at 3,000 tph)
or Pet coke (at 3,000 tph) to the travelling stacker,
for storage, or onto conveyor belts for direct loading
onto oceangoing vessels or river barges.
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A unit train batchweight load out, to load rail cars
with DRI or Pet coke.
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A travelling stacker, to stockpile iron ore, coal, Pet
coke or Met coke. Material is reclaimed using front-end
loaders feeding portable conveyors or dozer traps.
The project uses over 16,000 feet of conveyor. Since materials
vary in density, many conveyors use variable frequency drives
to move materials at the proper rate. A programmable logic
controller (PLC) automatically selects the correct conveyor
speed based on the material being conveyed. Also, because
several conveyors move material both in and out of the facility,
they had to be reversible.
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