Coal Feeding: Pressure-Sealing Solids Pump® Improves Feed Lone Star Industries - Cape Girardeau, Missouri The Need At Lone Star Industries’ Cape Girardeau, Missouri cement plant, reliable coal feed to the kiln is crucial for keeping the entire clinker production process on- line. When their coal supply was interrupted, plant personnel had only 15 minutes to restore feed before the pre-calciner and rotary kiln shut down. Coal was transferred from outdoor stockpiles to a pulverizing roller mill via a belt conveyor and a triple-gate dump valve located at the mill inlet. When air leaked into the mill, the pulverized coal was not conveyed away efficiently. Consequently, poor flowing coal accumulated in the mill and clogged the unit requiring costly downtime. Since the triple-flap gates were

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