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alloy aluminum amount analysis average bed was measured blast furnace bony Bull capacity carbon cars cent charge clay coal bed coal sampled coke composite concentrates conducted connection consumption containing copper cost described drift east electric furnace Electrochem electrode entry experiments face feet ferro-alloys ferrochrome ferrosilicon field figure floor formation given hard heading heat holder inches included in sample iron kilowatts Laboratory lignite loading loss manufacture material measured and sampled melting metal method miles mined mixed mouth necessary obtained opened operation output oxide plant possible pounds practice present production Railroad reducing represents resistance Roof sandstone screens Section A sample Sections of coal shaft shale shown silicon slag slope smelting steel sulphide sulphur taken temperature Thickness Thickness of bed Thickness of coal tons United zinc
Page 72 - ... obtained at cost price only through the Superintendent of Documents, Government Printing Office, Washington, DC The Superintendent of Documents is not an official of the Bureau of Mines. His is an entirely separate office and he should be addressed: SUPERINTENDENT OF DOCUMENTS, Government Printing Office, Washington, DC The general law under which publications are distributed prohibits the giving of more than one copy of a publication to one person. The price of this publication is 10 cents.
Page ii - The Bureau of Mines, in carrying out one of the provisions of its organic act — to disseminate information concerning investigations made — prints a limited free edition of each of its publications. When this edition is exhausted, copies may be obtained at cost price only through the Superintendent of Documents, Government Printing Office, Washington, DC The Superintendent of Documents is not an official of the Bureau of Mines.
Page 411 - Reprint of United States Geological Survey Bulletin 343. BULLETIN 27. Tests of coal and briquets as fuel for house-heating boilers, by DT Randall.
Page 408 - REPORT OF PROGRESS IN 1877. The Geology of LAWRENCE COUNTY, to which is appended a Special Report on the CORRELATION OF THE COAL MEASURES in Western Pennsylvania and Eastern Ohio. 8 vo., pp. 336, with a colored Geological Map of the county, and 134 vertical sections. By IC White.
Page 74 - In its pure condition it contains 11.4 per cent of potassa (K2O), 37 per cent of alumina (A12O3), 38.6 per cent of sulphuric anhydride (SO?), and 13 percent of water (H2O).
Page 61 - ... matter of fact, the cost of an electric furnace plant would be the cost of a regular plant plus the electrical installation, exclusive of the generating plant, because it is assumed that it would be possible to purchase power from some power company, and, if not, the generating plant would probably be considered as a separate organization, selling power to the smelter at so much per unit. Therefore, by electrical installation we mean the cost of transformers, bus-bars, cables, instruments, etc....
Page 197 - Experiments at Sault Ste. Marie on the electrical reduction of iron ores. Trans. Am. Electrochem. Soc. 12, 81-95 (1907) ; CA 2, 1412. Gas circulation in electric reduction furnaces. Trans. Am. Electrochem. Soc. 21, 403-407 (1912). Metallurgical calculations. Electrometallurgy...
Page 84 - ... and we understand that it is the intention to smelt copper ores regularly at this plant in the electric furnace. More or less experimental work has been done upon the subject, and, as a result of this work and reasoning by analogy, there seems no good reason why copper-bearing ores cannot be as successfully treated in an electric furnace as in a combustion furnace. In all furnaces of the latter class which are used for the treatment of copper ores, the fuel used takes no part in the reactions...
Page 92 - Although, as previously stated, more progress has been made to date in the electric smelting of zinc ores than with the electric smelting of any of the nonferrous metals except aluminum and metals forming ferro-alloys, such as silicon, chromium, ami tungsten, nevertheless the process is still largely in the experimental stage. There is no plant operating on a commercial scale except the Trollhattan works, which take 7,500 to 10,000 kilowatts.