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A kiln is a thermally insulated chamber, a type of oven, that produces temperatures sufficient to complete some process, such as hardening, drying, or chemical changes. Various industries and trades use kilns to harden objects made from clay into pottery, tiles and bricks. Various industries use rotary kilns for pyroprocessing—to calcinate ores, produce cement, lime, and many other materials. ==Uses of kilns== The earliest known kiln dates to around 6000 BC, and was found at the Yarim Tepe site in modern Iraq. Neolithic kilns were able to produce temperatures greater than 900 °C (1652 °F).〔James E. McClellan III; Harold Dorn. ''(Science and Technology in World History: An Introduction )''. JHU Press; 14 April 2006. ISBN 978-0-8018-8360-6. p. 21.〕 Uses include: *Annealing, fusing and deforming glass, or fusing metallic oxide paints to the surface of glass *Ceramics *Brickworks *Smelting ore to extract metal *Heating limestone with clay in the manufacture of Portland cement, the Cement kiln *Heating limestone to make quicklime or calcium oxide, the Lime kiln *Heating gypsum to make plaster of Paris *For cremation (at high temperature) *Drying of tobacco leaves *Drying malted barley for brewing and other fermentations *Drying hops for brewing (known as a hop kiln or oast house) *Drying corn (grain) before grinding or storage, sometimes called a corn kiln, corn drying kiln. *Drying green lumber so it can be used immediately *Drying wood for use as firewood *Heating wood to the point of pyrolysis to produce charcoal 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Kiln」の詳細全文を読む スポンサード リンク
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