The kiln was used for the transformation of He Mni Can-Barn Bluff’s raw limestone into commercial lime, quick lime or unslaked lime for use in mortar and plaster. Wood was used to fire the kiln. The lime burning process started with the raw material, a calcite limestone (calcium carbonate) which was placed in the kiln to be “burnt” or roasted at a temperature of 2,000 degrees Fahrenheit for several hours. The carbon dioxide was driven off in the burning process, leaving lime (calcium oxide). One ton or 2,000 pounds of limestone made 1,000 pounds of quicklime.

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Elevation 230 m

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Saturday 25 October

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Location: Red Wing, Goodhue County, Minnesota, United States

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