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Production Facilities:

The Landmark plant has two rotary kilns. A new hydrate plant was built at Landmark in 1990 and most of the hydrate production was gradually moved from the Graystone plant to that location. (See plants for specific plant locations.)

Manufacturing Process:

At the Landmark plant high calcium limestone (calcium carbonate) is quarried, crushed, washed and screened. The sized limestone is then calcined (heated) in rotary kilns from an initial temperature of around 1750oF (954oC) to a final temperature around 1950oF (1066oC) which results in the conversion of limestone (calcium carbonate) to quicklime (calcium oxide). The final product is further screened into the various sized quicklime products that are sold. A portion of the quicklime that is produced is sent to our hydrate manufacturing plant, located adjacent to the kilns, where the quicklime is reacted with water to produce dry hydrated lime products.(calcium hydroxide). Both quicklime and hydrated lime are very important products and both are actively marketed throughout the Southeast. (For details on the chemical reactions involved in the calcination and hydration production processes see chemistry.)

Limestone Source:

The limestone that is processed at our Landmark plant near Alabaster, AL comes from the Newala ledge of Ordovician Period stone, an amorphous mineral of 96-98% calcium carbonate.

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