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Procedure for refining ore after slag process
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Pyrometallurgical process for refining and casting copper
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New ore roasting process
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Process for refining elaterite
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Process for making sulfur protochloride
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Process for ore reduction
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Apparatus for refining metals
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Improved apparatus for refining metals
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Process of desulphurizing iron ores
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Metallurgical refining process
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Metallurgical process
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Process for obtaining sulphur
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Metallurgical process
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Metallurgical process
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Metallurgical process
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Process for improving the performance of foundry cupolas
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Apparatus for refining lead
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Process for desulphurizing metals
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Ores melting process
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Apparatus for smelting ores
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Process of treating ore
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Refining process for metals and alloys
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New naphtha refining process
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Metallurgical process
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Process for de-tinning iron
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