The use of the blowpipe, in the qualitative and quantitative examination of minerals, ores, furnace products and other metallic combinations / Edited, with emendations, by Dr. Sheridan Muspratt. With a preface by Baron Liebig.
- Karl Friedrich Plattner
- Date:
- 1850
Licence: Public Domain Mark
Credit: The use of the blowpipe, in the qualitative and quantitative examination of minerals, ores, furnace products and other metallic combinations / Edited, with emendations, by Dr. Sheridan Muspratt. With a preface by Baron Liebig. Source: Wellcome Collection.
399/440 page 375
![manDer described; the resulting tin is then weighed, tested as to its purity, and the value for the undressed ore calculated. Thus, for example, if 5000 milligrammes of such a fine pulverized ore yield by levigation with water, and subsequent decantation, a quantity weighing 700 milligrammes w'hen dried, from which, when thoroughly mixed and triturated in an agate mortar, two tin assays are prepared; now, if both these assays give 1*5 per cent, of tin, there would be con¬ tained in the 700 milligrammes of schlich— 100 : 700 : : T5 : ^; or, 1: 7::T5:^=7xT5 = 10*5 milligrammes of tin. If the levigation has been carefully performed, these 10*5 milligrammes represent very nearly the whole value of the tin contained in the above 5000 milligrammes of raw ore, which gives the quantity in 100 at — 5000 : 100 : : 10*5 : x; or, 50 : I : : 10*5 : ^ ^ = 0*21 per cent, of tin. (6) Determination of Tin in Minerals and Products CONTAINING THIS MeTAL IN AN OXIDIZED STATE. To this class belong, of minerals, pure Tinstone; and of artificial products, tin ashes,enamel, &c. Such substances do not require roasting, nor, if oxides of iron, copper, or antimony be not accidentally present, the treatment with hydrochloric acid, previous to the reduction of the oxide of tin. It is merely necessary to weigh 100 milli¬ grammes of the perfectly dried and finely pulverized tinstone, or of such artificial products as are not combined with silicic acid; to dress them with — Soda, 100 milligrammes. Borax Glass, 30 milligrammes; and subject them to reduction in the same manner as the substances belonging to tbe preceding class. * [The dross left on the floor of the reverberatory furnace in the refining of tin.]—Ed.](https://iiif.wellcomecollection.org/image/b29333714_0399.jp2/full/800%2C/0/default.jpg)
