Mineral Resources of the United StatesU.S. Government Printing Office, 1883 |
Dentro del libro
Resultados 1-5 de 57
Página 227
... roasting , as well as the production of iron sponge from the residues after leach- ing , has been considered . In 1882 shipments of copper ore from San Francisco to England by sea amounted to 864,700 pounds . During the same period the ...
... roasting , as well as the production of iron sponge from the residues after leach- ing , has been considered . In 1882 shipments of copper ore from San Francisco to England by sea amounted to 864,700 pounds . During the same period the ...
Página 249
... roasting enor- mous quantities in heaps , leaching , and precipitating the copper with scrap iron . The resulting copper , called precipitate , is an impure metal running from 50 to 70 per cent . Efforts have been made during the past ...
... roasting enor- mous quantities in heaps , leaching , and precipitating the copper with scrap iron . The resulting copper , called precipitate , is an impure metal running from 50 to 70 per cent . Efforts have been made during the past ...
Página 266
... roasting , but a still higher proportion of the iron is oxidized . 3. When , therefore , this roasted matte is again fused , either with a siliceous desulphureted ore or a siliceous slag , there is produced what is technically known as ...
... roasting , but a still higher proportion of the iron is oxidized . 3. When , therefore , this roasted matte is again fused , either with a siliceous desulphureted ore or a siliceous slag , there is produced what is technically known as ...
Página 269
... roasting five times , 16 tons , at $ 1.50 ....... Concentrating in black - copper furnace 13 tons of roast , at $ 1.50 . Roasting and concentrating 2 tons of white metal , at $ 3 .. Total ..... As against reverberatory treatment .. 4 00 ...
... roasting five times , 16 tons , at $ 1.50 ....... Concentrating in black - copper furnace 13 tons of roast , at $ 1.50 . Roasting and concentrating 2 tons of white metal , at $ 3 .. Total ..... As against reverberatory treatment .. 4 00 ...
Página 273
... roasting to sulphatize copper . - The sulphatization of the copper may , however , be accelerated by roasting the ore slowly . When roasting mixed sulphurets of iron and copper , sulphate of iron is produced at a low heat . This at a ...
... roasting to sulphatize copper . - The sulphatization of the copper may , however , be accelerated by roasting the ore slowly . When roasting mixed sulphurets of iron and copper , sulphate of iron is produced at a low heat . This at a ...
Contenido
1 | |
108 | |
172 | |
186 | |
213 | |
306 | |
346 | |
387 | |
449 | |
450 | |
457 | |
458 | |
459 | |
464 | |
465 | |
476 | |
477 | |
478 | |
479 | |
480 | |
482 | |
532 | |
566 | |
578 | |
585 | |
595 | |
601 | |
607 | |
664 | |
777 | |
789 | |
Otras ediciones - Ver todas
Términos y frases comunes
alloy amount anthracite antimony average barrels beds bituminous coal bullion California carbon Carolina Carroll county cement cents per pound chalcopyrite charge clay coal field Coal Measures cobalt coke color Colorado Company containing copper cost creek crystals cupola deposits district eastern estimated exports extensive feet fire-clay flasks following table fuel furnace galena gems gold Grafton county Gross tons heat hematite important inches industry iron Jersey Lake lead lime limestone Limonite localities Madison county manganese manufacture marl matte metal miles mineral mines Missouri mountain Nevada nickel obtained occurs Ohio output oxide Pacific Pennsylvania phosphate plates present production pyrites quarries quartz quicksilver railroad refining region reported river roasting rock Saint salt San Francisco sandstone seams siliceous silver slag small quantities smelting solution South spelter steel stone sulphate sulphide sulphuric acid supply surface thick tion Total United valley vats vein Virginia West western York zinc
Pasajes populares
Página 785 - Articles the growth, produce, and manufacture of the United States, when returned after having been exported, without having been advanced in value or improved in condition by any process of manufacture or other means...
Página 778 - ... advanced in value or condition by refining or grinding, or by other process of manufacture, and not specially provided for in this act, ten per centum ad valorem.
Página 781 - ... shafting; pressed, sheared, or stamped shapes, not advanced in value or condition by any process or operation subsequent to the process of stamping; hammer molds or swaged steel; gun-barrel molds not in bars; alloys...
Página 782 - Old copper, fit only for remanufacture, clippings from new copper, and all composition metal of which copper is a component material of chief value, not specially provided for in this act, one cent per pound.
Página 781 - ... tools ; all descriptions and shapes of dry sand, loam, or iron-molded steel castings; sheets and plates and...
Página 779 - ... per square foot; above that, and not exceeding twenty-four by thirty inches square, one and one-fourth cents per square foot...
Página 786 - Philosophical and scientific apparatus, instruments and preparations ; statuary, casts of marble, bronze, alabaster, or plaster of Paris ; paintings, drawings, and etchings, specially imported in good faith for the use of any society or institution incorporated or established for religious, philosophical, educational, scientific, or literary purposes, or for encouragement of the fine arts, and not intended for sale.
Página 787 - ... shall be given under such rules and regulations as the Secretary of the Treasury may prescribe, for the payment of lawful duties which may accrue should any of the articles aforesaid be sold...
Página 786 - The same be specially imported, in good faith, for the use -of any society incorporated or established for philosophical, literary or religious purposes, or for the encouragement of the fine arts, or for the use or by the order of any college, academy, school, or seminary of learning in the United States...