CA187772A
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Zinc recovery
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CA183078A
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Zinc production
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CA183076A
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Zinc purification
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CA183074A
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Zinc recovery
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CA183081A
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Ore purification
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CA168441A
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Zinc recovery
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US1167701A
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Process of recovering zinc from its ores.
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US1167700A
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Process of extracting zinc from its ores.
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US1115689A
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Leaching-solution-heating system.
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US1104907A
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Process of reducing cuprous chlorid.
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US1114372A
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Process of roasting ores.
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US1090549A
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Ore-cooler.
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US1114371A
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Roasting-furnace.
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US1070490A
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Roasting-furnace.
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US1076833A
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Process of extracting copper from ore.
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US903732A
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Copper-leaching process.
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CA90545A
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Ore treating process
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