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potash
Potash is any of various mined and manufactured salts that contain potassium in water-soluble form.〔(Potash ), USGS 2008 Minerals Yearbook〕 The name derives from "pot ash", which refers to plant ashes soaked in water in a pot, the primary means of manufacturing the product before the industrial era. The word "potassium" is derived from potash.
Today, potash is produced worldwide at amounts exceeding 30 million tonnes per year, mostly for use in fertilizers. Various types of fertilizer-potash thus constitute the single largest global industrial use of the element potassium. Potassium was first derived by electrolysis of caustic potash (aka potassium hydroxide), in 1808.
==Terminology==
Potash refers to potassium compounds and potassium-bearing materials, the most common being potassium chloride (KCl). The term "potash" comes from the Middle Dutch word ''potaschen'' ("pot ashes", 16th century). The old method of making potassium carbonate () was by collecting or producing wood ash (an occupation carried out by ash burners), leaching the ashes and then evaporating the resulting solution in large iron pots, leaving a white residue called "pot ash". Approximately 10% by weight of common wood ash can be recovered as pot ash. Later, "potash" became the term widely applied to naturally occurring potassium salts and the commercial product derived from them.
The following table lists a number of potassium compounds which use the word ''potash'' in their traditional names:
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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