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US2767056A
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Process for making hydrochloric acid and recovering metal oxides
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US2565718A
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Liquid rotor spray mechanism
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US2471724A
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Gas washer
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US2448297A
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Liquid rotor spray mechanism
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US2404273A
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Method of and apparatus for spraying
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US2414718A
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Gas washer
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US2363572A
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Treatment of zinc carbonate ores
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Method and apparatus for spraying
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US2035592A
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Apparatus for treating mixtures of finely divided solids and liquids in thickening and countercurrent washing operations
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US2001409A
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Process of treating ores with sulphuric acid
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US1937636A
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Process of treating lead-zinc sulphide ores
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Process of making pigments from lead ores
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US1937635A
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Process of treating lead sulphide ores
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US1937637A
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Process of treating lead sulphide ores
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US1937632A
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Process of treating zinc ores
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US1937639A
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Process of making zinc sulphide pigment
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US1937638A
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Process of treating zinc ores
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US1937634A
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Process of treating zinc ores
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US1937631A
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Process of treating zinc ores
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US1937633A
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Process of treating zinc ores
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