Читать книгу Henley's Formulas, Recipes and Processes (Applied Chemistry) - Various - Страница 687
Drosses.
Оглавление—All the softer grades of metal throw off considerable dross, which is usually skimmed off; especially with tin and its composition. Should much of this gather on the top of the molten {152} metal, the drosses should all be saved, and melted down when there is enough for a kettle full. Dross may be remelted five or six times before all the good metal is out.
