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Reductive precipitation of molybdenum oxides for recovery of molybdenum from hypochlorite leach solutions

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dc.contributor.author Reid, Duncan Craig
dc.date.accessioned 2010-03-05T22:08:25Z
dc.date.available 2010-03-05T22:08:25Z
dc.date.copyright 1979 en
dc.date.issued 2010-03-05T22:08:25Z
dc.identifier.uri http://hdl.handle.net/2429/21573
dc.description.abstract The feasibility of reductive precipitation of molybdenum oxides as the molybdenum recovery stage of a hypochlorite leach of Cu-Mo rougher concentrates has been investigated. Hydrogen gas at elevated temperature and pressure and hydrazine at moderate temperature and atmospheric pressure were used as reductants. Reduction was performed on solutions containing 5 to 17 g/l Mo as sodium molybdate. Hydrogen reduction was successful only in the presence of a Pt catalyst, temperature = 200°C, pressure = 30 atm of H₂, and initial acidification to pH = 2. Ten hours was required to obtain 90% recovery of molybdenum as MoO₂. Reduction with hydrazine yielded an MoO(OH)₃ precipitate with 90% recovery obtained in 40 minutes at 50°C, pH = 4.5, and initial mole ratio of hydrazine to molybdenum of 4:1. Precipitation under the same conditions in the presence of 3 M NaCl gave only 70% recovery in 4 hours and the precipitate contained 3.3% sodium. The effect of NaCl is explained in terms of stabilization of mixed valent ionic molybdenum species in the presence of NaCl. en
dc.language.iso eng en
dc.relation.ispartofseries UBC Retrospective Theses Digitization Project [http://www.library.ubc.ca/archives/retro_theses/] en
dc.title Reductive precipitation of molybdenum oxides for recovery of molybdenum from hypochlorite leach solutions en
dc.type Electronic Thesis or Dissertation en
dc.degree.name Master of Applied Science - MASc en
dc.degree.discipline Metallurgical Engineering en
dc.degree.grantor University of British Columbia en
dc.degree.campus UBCV en
dc.description.scholarlevel Unknown en


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