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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
C22B34/00—Obtaining refractory metals
C22B34/30—Obtaining chromium, molybdenum or tungsten
C22B34/32—Obtaining chromium
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FR905938D1943-08-071944-07-20Procédé pour l'enrichissement des minerais métallifères pauvres, en particulier des minerais de chrome
ExpiredFR905938A
(fr)