Metallurgical Treatment of the Low Grade And Complex Ores of Utah a Preliminary
Metallurgical Treatment of the Low Grade And Complex Ores of Utah a Preliminary
United States Bureau of Mines
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74, August 16, 1902, p. 217. & MacGregor, F. S. , Progress in electrostatic ore dressing: Trans. Am. Electrochem. Soc. , vol. 24, 1913, p. 352. c Hoover, T. J. , Concentrating ores by flotation (London), 1912, p. 91, d Hoover, T. J. , op. Cit. , p. 97. Hoover, T. J. , op. Cit. , p. 105. / Results are for 1913. g About. The following extract is from the same paper : In presenting these facts as regards the methods which are used for concen- trating zinc ores, we do not wish to be understood as c...riticizing any of the concentration processes mentioned, as they do the work for which they are installed, namely, to separate gold-silver-lead-copper-zinc-bearing ores into two products, one of which shall contain enough zinc to enable it to be profitably treated by the zinc smelter, and the other no more than will permit of its being satisfactorily treated in a copper or lead blast furnace. As is well known, in such furnaces, if the zinc content of the ore constituting the charge is not greater than 10 per cent, it can be gotten rid of in the slag and fumes.
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