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C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
C22B1/00—Preliminary treatment of ores or scrap
C22B1/02—Roasting processes
C22B1/08—Chloridising roasting
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FR568328D1923-06-021923-07-03Perfectionnements au traitement des minerais, mattes, etc., contenant des sulfures de zinc et de plomb
ExpiredFR568328A
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