In the preparation of alum from clays or from bauxite, the material is gently calcined, then mixed with sulphuric acid and heated gradually to boiling; it is allowed to stand for some time, the clear solution drawn off and mixed with acid potassium sulphate and allowed to crystallize.
A strong solution of the chloride made into a thick paste with calcined magnesia sets in a few hours to a hard, stone-like mass, which contains an oxychloride of varying composition.
Potash-alum and pitch were calcined together, and the mass was treated with hydrochloric acid; charcoal and water to form a paste were next added, and the whole was dried and ignited in a current of air and steam.
On the one hand, it had been held that when a substance was burned or calcined, it combined with an air ; on the other hand, the operation was supposed to be attended by the destruc tion or loss of the igneous principle.
calcined与发音含义,同义词,反义词,翻译,刑和更多的