- 荒煙楚楚Lv 61 0 年前最佳解答
- TigerLv 51 0 年前
I couldn't find any better Chinese version, let me copied this reference for you...please let me know if further question.ManufactureHistorically, nitre-beds were prepared by mixing manure with either mortar or wood ashes, common earth and organic materials such as straw to give porosity to a compost pile typically 1.5 metres high by 2 metres wide by 5 metres long. The heap was usually under a cover from the rain, kept moist with urine, turned often to accelerate the decomposition and leached with water after approximately one year. The liquid containing various nitrates was then converted with wood ashes to potassium nitrates, crystallized and refined for use in gunpowder.In England, the privilege of manufacturing explosives had been in the hands of the family of John Evelyn, the celebrated diarist, as a crown monopoly since before 1588.Today, most potassium nitrate comes from the vast deposits of sodium nitrate (NaNO3, nitratine) in the Chilean deserts. The sodium nitrate is purified and then reacted in solution with potassium chloride (KCl, sylvite), from which the less-soluble potassium nitrate is precipitated out.ApplicationsOne of the most useful applications of potassium nitrate is in the production of nitric acid, by adding concentrated sulfuric acid to an aqueous solution of potassium nitrate, yielding nitric acid and potassium sulfate which are separated through fractional distillation.Potassium nitrate is also used as a fertilizer, as a model rocket propellant, and in several fireworks such as smoke bombs, in which a mixture with sugar produces a smoke cloud of 600 times their own volume. In the process of food preservation, potassium nitrate is a common ingredient of salted meat, but heart patients need take care with it. Potassium Nitrate is also a main component in stump remover; it accelerates the natural decomposition of the stump. It has also been used in the manufacture of ice cream and is the active ingredient in toothpaste for sensitive gums.
2006-04-12 07:20:11 補充：
A popular misconception is that potassium nitrate is an antaphrodisiac and was added to food in all-male institutions. In fact potassium nitrate has no such effect in humans.
2006-04-12 07:20:22 補充：
Recently, the use of potassium nitrate in toothpastes for sensitive teeth has increased dramatically, despite the fact that it has not been shown to actually help dental hypersensitivity.參考資料： from Tiger & google.com
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- 睿達Lv 41 0 年前