Hydrogen production in Bayer process digestion
It is generally accepted that hydrogen evolution in Bayer process digestion is a result of the action of caustic soda on organic compounds present in the bauxite, but little is known about the mechanisms and rates of hydrogen production, which particular types of organic compounds produce it, or how hydrogen production varies between bauxite ores. Investigations by CSIRO at the Waterford Wet Oxidation Facility are underway to quantify the rates of hydrogen production from a range of compounds known or likely to be present in bauxites or Bayer liquor, and to group compounds into classes according to their propensity for hydrogen production. Results from the anaerobic thermal degradation of formate, trimellitate, gallate, gluconate and tartrate at 250 ℃ demonstrate that hydrogen production is dependent on the compositions and structures of the parent organic compounds. Digestion tests on an Australian bauxite have shown a strong temperature dependence of hydrogen production at 150 ℃ and 250 ℃. Ongoing work is extending the number and variety of organic compounds investigated and will aim to quantify the specific hydrogen generation rates of a range of bauxites from the major bauxite provinces of the world.
hydrogen production organics bauxite digestion wet oxidation
Allan Costine Mark Schibeci Joanne Loh Greg Power Robbie McDonald
CSIRO Light Metals Flagship (GSIRO Poress Science and Engineering) and Parker CRC for ydrometallurgy PO Box 7229, Karawara, WA 6152, Australia
国际会议
XVIII International Symposium of ICSOBA(第18届国际铝土矿、氧化铝及铝工业学术年会)
郑州
英文
369-375
2010-11-25（万方平台首次上网日期，不代表论文的发表时间）