General Dynamics Corp.
Marblehead Lime Kiln Grinding Mill Plant
Buffington, Indiana
Roberts & Schaefer provided engineering, procurement, and
construction services to General Dynamics Corp. for a grinding
mill system at the Marblehead lime kiln and plant. A fines storage
plant holds processed 1/4 inch X 0 fines, which are reclaimed
using a fixed rate screw feeder ahead of an elevator rated at
25 TPH. Material then moves via two 14-inch diameter screw conveyors
to a 24-inch fines transfer belt, which also receives 1/4 inch
X 0 material from the existing facilities. The belt delivers 1/4
inch X 0 material to a 490-ton storage tank. From the storage
tank, material may either be loaded directly onto rail cars or
move via a 20-inch diameter screw conveyor to a mill surge bin.
Downstream from the new screw mill circuit addition, a 30-inch
lime transfer conveyor, rated at 170 TPH, returns coal and lime
to a crusher feed belt. The material passes through a railroad
crusher to produce nominal 3/4 inch X 0 size. The crushed material
is delivered to a 108-ton storage tank, from which it is reclaimed
by a pebble feeder that discharges to the mill storage bin.
From the mill storage bin, the product feeds two Whizzer 400
HP air-swept mills, which include exhausters and oils pumps, and
collects in two independent cyclone circuits, which share a common
dust collection system. Each cyclone discharges into a separate
720-ton tank. The dust product discharges into a third 720-ton
tank or via a 24-inch line screw conveyor to a 600-ton 150-mesh
storage tank.
The final product collects in one of six storage tanks, based
on product size. Each tank includes a truck loading spout as well
as a 24-inch loadout screw to move the material to a rail car
loading facility.
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