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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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FR692786D1929-03-281930-03-26Procédé catalytique pour le traitement des minerais de chrome en vue de l'extraction de ses composés
ExpiredFR692786A
(fr)
Procédé de traitement du chlorure de plomb ou du chlorure basique de plomb, en vue de sa transformation en autres composés de plomb, et application du procédé à l'extraction du plomb des minerais, résidus, etc.