The use of the blowpipe in the examination of minerals, ores, furnace-products, and other metallic combinations / By Professor Plattner ... Translated from the German, with emendations, by Dr. Seridan Muspratt ... With a preface by Professor Liebig.
- Karl Friedrich Plattner
- Date:
- 1845
Licence: Public Domain Mark
Credit: The use of the blowpipe in the examination of minerals, ores, furnace-products, and other metallic combinations / By Professor Plattner ... Translated from the German, with emendations, by Dr. Seridan Muspratt ... With a preface by Professor Liebig. Source: Wellcome Collection.
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![veins and gangues, or vein-stones, with Granite, Gneiss, Mica- ceous Schist, itharge, Talk-Clay, Calcareous Spar, and many other minerals and rocks, as also with Iron and Arsenical Pyrites, Speiss-Glanz, Blende, Wolfram, Molybdic Ochre, Iron Ochre, Magnetic Iron Ore, and, in a very large number of these minerals, only in so finely-disseminated a state that the presence of tin in them can scarcely be suspected, and cannot be ascertained with accuracy, even by a trial with the blowpipe, owing to the minute quantity present ; but by care- ful levigation and decantation of such an ore, reduced to a fine powder and weighed, the earthy particles may be removed and a schlich obtained in which the tin ore is concentrated, and from which, when perfectly dried and weighed, at least two quantitative tin assays should be made according to the man- ner 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 when 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: JOO: 24°5 <3 or, lL: 7::15:e2=7 X15 =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 : a; | OF x80 % 1:: 105 :a2——~= 0°21 per cent. of tin. ( b) 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, fin-ashes,* enamel, &c. * [ The drosseft on the floor of the reverberatory furnace in the re- fining of tin.]—Trans.](https://iiif.wellcomecollection.org/image/b29334810_0370.jp2/full/800%2C/0/default.jpg)
