METHOD FOR PRODUCING HIGH-PURITY MOLYBDENUM CHEMICALS FROM MOLYBDENUM SULFIDES

The integrated process of the subject invention is directed to the production of high purity molybdenum chemical products from molybdenum sulfide containing materials by a series of steps, including roasting, sulfuric acid leaching of the calcine to remove impurities from the calcine, ammonia digest...

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Bibliographische Detailangaben
Hauptverfasser:	JHA, MAHESH, C, MAY, WILLIAM, A
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F FERROUS OR NON-FERROUS ALLOYS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS INORGANIC CHEMISTRY METALLURGY PRETREATMENT OF RAW MATERIALS PRODUCTION AND REFINING OF METALS TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	The integrated process of the subject invention is directed to the production of high purity molybdenum chemical products from molybdenum sulfide containing materials by a series of steps, including roasting, sulfuric acid leaching of the calcine to remove impurities from the calcine, ammonia digesting of the calcine to form a pregnant molybdate solution containing dissolved molybdenum, and recovery of the dissolved molybdenum by crystallization and/or molybdic acid precipitation. The process is a "zero discharge" process in that all process waste streams are combined to produce a ferrous ammonium sulfate fertilizer byproduct. Le procédé intégré de la présente invention concerne la production de produits chimiques de molybdène très purS à partir de matières contenant du sulfure de molybdène par une série d'étapes comprenant la calcination, le lessivage du calcinat à l'acide sulfurique afin d'éliminer les impuretés du calcinat, la digestion du calcinat au gaz ammoniac pour former une solution de molybdate additionnée contenant du molybdène dissous, et la récupération du molybdène dissous par cristallisation et/ou précipitation à l'acide molybdique. Le procédé est un procédé à "zéro décharge" en ce sens que tous les flux résiduels du traitement sont combinés pour produire un produit dérivé constituant un engrais à base de sulfate d'ammonium ferreux.