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Copper dressing relied extensively on manual labour throughout the 18th and 19thcenturies though mechanisation did play a part. Copper crushers ‘Cornish rolls’ wereintroduced in the early 19th century and low grade or otherwise difficult ores were also
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processing copper ore disadvantages. Copper ores include copperII oxide and copperIIsulfide CopperII oxide can be reduced by reaction with carbon Some copper ores maycontain only small amounts of copper These are called low grade ores and have less than 1
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From ores. For copper-cobalt ores a sulfide concentrate is roasted under controlledconditions to transform most of the cobalt sulfide to a soluble sulfate while minimizingthe change of copper and iron to their water-soluble states. The product is leached the
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EPA promulgated the Ore Mining and Dressing Effluent Guidelines and Standards 40 CFRPart 440 in 1975 and amended the regulation in 1978 1979 1982 and 1988.The regulationcovers wastewater discharges from ore mines and processing operations.
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The basic disadvantages of classical methods for Re recovery from ores and concentrateswere shown. An alternative method by phytoextraction of Re from ore dressing soils wasproposed.
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