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The Iron Age 1880-03-18: Vol 25 Iss 12

1880 Reed Business Information US

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# ES ia. Vol. XXV : No. 12. Notes on the Siemens Direct Process.* BY A. L. HOLLEY, There is a growing demand for pure and cheap material for fine open-hearth steel ; a material not only very free from phos- phous, but from carbon and silicon, so that it may be rapidly converted into steel. Iron and steel scrap are not trustworthy as to quality, and they are often dear. There are three methods of purifying cheap materials .for the open-hearth. 1 Mechanical puddling, as done at Creusot, which removes 90 per cent. of the phosphorus from pig iron. 2. Krupp’s washing process (the conduct and results of which I fully described in a for- mer paper), wuich eliminates 70 to 80 per cent. of the phosphorus and most of the sulphur and silicon from pig iron. Neither of these processes would sufficiently purify, for very fine steel, those very impure pigs which are cheapest in many parts of the United States. 3. The process of producing directly from the ore, an iron which is practically pure chemically, although mechanically mixed with the impurities of the ore. This is the oldest of iron processes ; one form of it, the Catalan forge, employed to produce charcoal blooms, is still in use, but it…

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The Iron Age 1880-03-18: Vol 25 Iss 12. Reed Business Information US. 1880.