Silver and Gold: an Account of the Mining and Metallurgical Industry of the United States: With Reference Chiefly to the Precious MetalsJ.B. Ford, 1873 - 566 من الصفحات |
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الصفحة 412
... Cupellation of rich lead . The first fusion . -Eleven years ' experience has proved that the most efficient slag is one approaching the composition of a bi - silicate . The following is an average analysis : Silica .. Alumina ...
... Cupellation of rich lead . The first fusion . -Eleven years ' experience has proved that the most efficient slag is one approaching the composition of a bi - silicate . The following is an average analysis : Silica .. Alumina ...
الصفحة 414
... Cupellation. is. performed. in. a. German. furnace. ,. with. movable. hood. ,. made very low so that the heat from the fuel is thoroughly util- ized . Inasmuch as none of the side products are sold , and there is no need of having them in ...
... Cupellation. is. performed. in. a. German. furnace. ,. with. movable. hood. ,. made very low so that the heat from the fuel is thoroughly util- ized . Inasmuch as none of the side products are sold , and there is no need of having them in ...
الصفحة 415
... cupellation , 1866 . Quantity . Lead ,. * In calculating this it is to be remembered that 28 tons of matte from the previous year were smelted , which must be counted as ore in calculating the expense of char- coal and labor . coal and ...
... cupellation , 1866 . Quantity . Lead ,. * In calculating this it is to be remembered that 28 tons of matte from the previous year were smelted , which must be counted as ore in calculating the expense of char- coal and labor . coal and ...
الصفحة 416
... Cupellation Total Labor , Charcoal , Wood , Lead , days . bushels . cords . pounds . 1.8 65.2 0.46 16.6 8.0 0.24 0.37 0.69 9.7 2.50 82.17 0.69 17.7 To this must be added a small quantity of wood , or refuse charcoal , and labor used in ...
... Cupellation Total Labor , Charcoal , Wood , Lead , days . bushels . cords . pounds . 1.8 65.2 0.46 16.6 8.0 0.24 0.37 0.69 9.7 2.50 82.17 0.69 17.7 To this must be added a small quantity of wood , or refuse charcoal , and labor used in ...
الصفحة 418
... cupellation , would complete the process . We should then have a process divided as follows : 1. Concentration of poor ore . 2. Roasting of concentrated and rich ore . 3. Fusion of roasted ore with lead . 4. Roasting of matte . 5 ...
... cupellation , would complete the process . We should then have a process divided as follows : 1. Concentration of poor ore . 2. Roasting of concentrated and rich ore . 3. Fusion of roasted ore with lead . 4. Roasting of matte . 5 ...
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