Production of intermediate grade manganese concentrate from low grade manganiferous ores
Patent 5496526 Issued on March 5, 1996. Estimated Expiration Date: 
August 30, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 30, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesInventorsAssigneeApplicationNo. 130080 filed on 08/30/1993US Classes:423/49, Group VIIB metal (Mn, Tc, or Re)75/749, With physical separation or classification of solids209/1, MISCELLANEOUS209/39, Magnetic and fluid suspension241/23With heating or cooling of materialExaminersPrimary: Bos, StevenAttorney, Agent or FirmForeign Patent References
International ClassesC22B 047/00C22B 001/00 C01G 049/00 B03C 001/30 AbstractA process for producing intermediate grade manganese concentrate from low grade manganiferous ores is disclosed. A low grade manganiferous ore containing silicon, iron, between 1 and 20 per cent manganese and oxides of silicon, iron and manganese is first crushed to reduce the size of the manganiferous ore to a fraction of its original size. The crushed manganiferous ore is then heated to a temperature sufficient to chemically transform the manganese and iron in the manganiferous ore to an artificial magnetic, manganese-iron spinel. The heat treated manganiferous ore is cooled, preferably by air, and then beneficiated by further crushing and grinding to liberate the artificial manganese iron spinel from the silicon and other oxides within the ore. Finally, the artificial manganese-iron spinel is magnetically separated from the silicon and other oxides within the ore to increase the concentration of the manganese and thereby provide an intermediate grade manganese concentrate.Other References
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