The term "calcination" broadly refers to a process at extremely high temperatures which effects a desired change in a given material. Calcining can include oxidation, reduction, removal of chemically bound water or other types of molecular change, crystal structural change or pyrolysis that converts a material's physical or chemical properties. Calcining is typically used to process materials that are fine and dusty, sensitive to oxidization, combustible, explosive, potentially contaminating and/or thermally sensitive.
Heyl & Patterson Blog
Flour mills may not seem to be particularly dangerous places, but they have been the source of some devastating explosions. In 1878 in Minneapolis, Minnesota, a spark ignited airborne flour dust within the Washburn “A” Mill, the largest flour mill in the U.S. at the time, and resulted in the deaths of 18 people, a fire that destroyed five other mills and reduced the city’s milling capacity by one third. Powders such as flour have a very high surface area, so they can combust with explosive force if ignited.
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