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 Engineering
design, procurement, and construction management services were
provided for Blue Circle Inc.'s Roberta Plant, a major producer
of cement and lime in Calera, Alabama. The project consisted of
a complete new raw material facility serving the production plant,
and designed to produce raw material feed stock at a rate of 1,200
TPH. Selective mining procedures deliver run-of-quarry rock to
a truck dump and primary crushing station located in the quarry
pit. Primary crushed limestone rock is conveyed from the pit to
a location adjacent to the cement and lime production circuits.
The lime stone rock is further crushed in a secondary crusher
before reporting to a primary screening station for sizing. Oversize
material reports to a tertiary crusher arranged in closed circuit
and, after crushing, is recombined with the primary screen station
feed. When producing cement grade limestone, two grades of limestone
are produced and report to separate storage stations. When producing
lime grade limestone, a secondary screening station sizes the
limestone in the variety of size fractions required for each grade,
and delivers the finished product to separate storage stations.
All materials are reclaimed from storage, reporting to each production
plant. The facility also provides means to handle clay/shale and
dirty rock materials directly to the cement production plant.
The facility incorporates the most modern of process technology.
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