A Preliminary Report on a Part of the Iron Ores of Georgia: Polk, Bartow and Floyd Counties (Classic Reprint) - Softcover

Excerpt from A Preliminary Report on a Part of the Iron Ores of Georgia: Polk, Bartow and Floyd Counties

The most common impurities of the brown iron ore are silica, alumina, phosphorus, sulphur and manganese. The two first of these impurities usually occur, in great measure, in the brown ores of Georgia, in the form of chert or sand with Clay, as a physical mixture. They are readily reduced to a minimum, by washing and hand-picking. The other physical impurities are of such chemical constitution, that they determine the Character of the iron produced by the furnace. The phosphorus is present, chiefly in the form of apatite. It renders the iron brittle, when cold. This element is especially objectionable, in ores to be used, for making steel, by What is known as the Bessemer pro cess. The Bessemer limit of phosphorus has been placed at 0 5. Per cent. For 50 per cent. Ore, Which is much lower, with only one or two exceptions, than the percentage of phosphorus given in any of the analyses of the brown ores, in this report. Sulphur, which occurs chiefly in the form of pyrite, a sulphide of iron.

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