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Copper recofery process
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Production of iron sulphate
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Flotation of cement copper
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Recovery of oxidized copper
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Method of and apparatus for treating ores and similar materials
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Apparatus for the absorption of gases by liquids
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Method of fixing sulphur dioxide as sulphuric acid and ferric sulphate
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Percolation leaching method
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Open drainage leaching process
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Aeration of liquids
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