Molybdenum extraction from molysulfide
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The most recent work on aluminothermic reduction appeared in an USBM report z~ where molysulfidealuminum compacts were reacted at approximately 800~ * The reaction products consisting of an impure *Factors for converting all data to SI units are given in Appendix I.
molybdenum alloy and aluminum sulfide were subsequently treated with water. The hydrolysis of aluminum sulfide resulted in the formation of hydrogen sulfide which was considered suitable for conversion to elemental sulfur by the Claus P r o c e s s . The p r o c e s s proceeded to r e c o v e r high purity MoOs by allowing the residue from the hydrolysis step to oxidize and then treating it with aqueous ammonia. Other than these aluminothermic p r o c e s s e s , several patents n - 14 were issued on molybdenite reactions with lead, tin, and sodium. In addition to the p r o c e s s e s reviewed above, many investigations on molybdenum extraction by electrometallurgical methods were reported. Electrowinning of molybdenum from its oxide, dissolved in a variety of molten baths containing pyrophosphate or tetraborate salts, was reported. 15-~6 In the method investigated by Surf, Mukherjee, and Gupta, ~7 molybdenum r e c o v e r y from sodium molybdate involved two steps. The first step consisted of preparation of pure di-molybdenum carbide (M%C) by fused salt electrolysis of the molybdenum salt in a NaF-KF-NazB4OT-Na2COs bath. The second step consisted in preparing the metal by interaction of MoaC and MoO2 under vacuum. In another case ~s M%C was prepared by molyhdenite electrolysis, and the metal was produced by Me,C-MoO s reaction in an inert atmosphere. In the case of electrolytic r e c o v e r y of molybdenum from halide baths, pioneering work was reported by Senderoff, and Brenner 19 in 1954. Electrodeposition of molybdenum was shown possible using molybdenum anode and KC1-KsMOC1e electrolyte. They concluded that the p r o c e s s was most suited for electroplating, electroforming, or electrorefining. Based on this conclusion, many investigations subsequently appeared on molybdenum electrorefining using the same halide bath. Cummings, Cattoir, and Sullivan z~ from the USBM r e : ported production of 99.99 pct pure molybdenum, using VOLUME 5, MARCH 1 9 7 4 - 7 0 7
scrap metal as the anode in an inert atmosphere electrolysis employing a KC1-K~MoC16 electrolyte. This bath was found to be the best among several halide baths, it was easily prepared and yielded a high-quality deposits. Recent investigations conducted in this laboratory led to the electrodeposition of high-purity molybdenum in this well established KC1-K3MoC16 electrolyte. These p r o c e s s e s involved use of molybdenum carbide, 2~ molybdenum di-oxide-carbon, ~2 and aluminothermic molybdenum ~ as soluble anodes. In a metallurgical processing sequence, the r e c o v e r y of molybdenum directly from the sulfide would be more attractive than via the oxides, as it would involve fewer steps. The present investigation was concerned with two different molybdenum extraction propositions from t
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