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( I. INTRODUCTION Rain Cll Carbon, LLC (RainCII), owns and operates

a coke calcining facility located at 863 Old Richburg Road in Purvis, Lamar County, Mississippi. Figure

1 shows the location of the facility A Site Plan is provided
as Figure
2 and a Process Flow Diagram

is included
as Figure 3. A.

. Process Description The primary process equipment
at the RainCII Purvis facility includes

a natural gas fired rotary kiln, a cooler quencher, and cyclones for control of particulate matter (PM) emissions. Process support services include bulk material receiving, storage, and handling systems for green and calcined coke. The plant receives green coke via railcar or truck. The material

is off loaded into storage buildings,

is then transferred
by front-end loader onto
a covered conveyor, then into a bucket elevator to the green coke day storage tank. The green coke continuously feeds from the day tank into the elevated end of the inclined rotary kiln for processing
to reduce volatile organic compounds (VOCs) and moisture content of the coke and chemically reform the carbon content of the material to produce the final product, calcined coke. The kiln is 120 feet long and 9 feet in diameter with an approximate 0.5-inch slope per foot. Since the kiln is inclined, the coke flows by gravity into the cooler and the flue gases flow countercurrent

to the coke. The coke is heated to a temperature
of approximately 2,400°F as it proceeds through the kiln for approximately

SO minutes to one hour. As the coke is heated, the VOCs and water are removed and enter the flue gas stream along with entrained coke particles. The coke proceeds through the kiln and is discharged from the low end into the quench section (rotary cooler), which
is 52 feet in length and 8 feet in diameter. The calcined coke is "quenched" using
a water spray of approximate 20-30 gallons per minute to reduce the coke temperature
to about 350-400°F. A natural gas fired burner with
a rated capacity of 40 million British Thermal Units (MMBTU) per hour is used during startup to heat the kiln prior to introducing feed. The burner
is then throttled to 20 to 35 MMBTU per hour until the kiln reaches an operating temperature
of approximately 2,400°F. Combustion
of volatilized compounds from the coke and consumption
of green coke, itself, provide the primary source of heat for the calcining process

. The process consumes approximately 20% of the green coke feed with the remaining 80% calcined to form the high purity carbon product, known as calcined coke. Flue gases from the kiln are directed into two parallel cyclones to remove particulate matter (PM) prior to exhausting
to the atmosphere. The flue gases exit the cyclones and discharge
to the atmosphere via an approximate 113-foot stack.

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