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.
365/392 page 341
![_ pure malleable tin, whose weight agreed well with that found by calculation. Mixtures of the pure tinstones with other ores containing either copper or iron, yield exactly the same result. It may be objected to the employment of hydrochloric acid for the separation of oxide of tin from oxide of iron, that it does not belong to blowpipe analyses ; but if the difficulties which are to be encountered in the dry way with the blow- pipe, in order to purify peroxide of tin from the oxides of iron and copper, be compared with the easy and accurate method by the moist way, there is no doubt the latter will be chosen as the best which can be employed in the quantitative examination of ferruginous and cupriferous minerals and dressed ores for tin. In respect to the quantitative examination for tin ;—mine- rals, ores, and artificial products, in which this metal forms an essential ingredient, may be classed as follows :— (a) Such as contain the tin combined with sulphur ; (6) Those containing the tin in an oxidized state ; and, (c) Those in which metallic tin is alloyed with other metals. (a) DETERMINATION OF TIN IN MINERALS, ORES, AND ARTIFICIAL PRODUCTS, IN WHICH THE TIN IS COMBINED WITH SULPHUR. Besides Tin Pyrites, tin schlichs,* dressed on the great scale, may be placed in this division ; although they contain tin in the state of oxide, they very often, notwithstanding the roasting, exhibit traces of metallic sulphurets and arsenical compounds. Of the artificial products which belong to this class, I will only mention Mosaic Gold (sulphur, combined with excess of tin). To determine the tin in any of the substances belonging to this class, an assay powder should be prepared according to the method given at page 263,—100 milligrammes of which is to be weighed and roasted, in order to free it from volatile ingredients. But as the roasting of tin assays is exactly * [Explained in note, page 161.]—Trans.](https://iiif.wellcomecollection.org/image/b29334810_0365.jp2/full/800%2C/0/default.jpg)
