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Recent content by capral

  1. capral

    CAUSTICISATION

    I am currently researching the effect of lime addition to aluminate/carbonate containg solutions in the bayer process in aluminium refineries. Does anyone know a good source of technical information located on the net?
  2. capral

    ALUMINIUM DISSOLUTION

    What is the concentration of NaOH required in a caustic/water solution to cause maximum dissolution rate of aluminium? We currently use 25% NaOH to dissolve aluminium from extrusion dies.
  3. capral

    DIFFUSION DIALYSIS MEMBRANES

    Does anyone know if it is possible to use cation membranes in a diffusion dialysis system to remove free NaOH and retain sodium aluminate (dissolved aluminium in caustic). Is this process possible? Can the membranes withstand the 25% NaOH soln and the pH 13? Are there companies out there that...
  4. capral

    Caustic Soda Recovery

    To my knowledge, aluminium hydroxide best precipitates at pH between 8 and 9 - at a pH of 13, a lot of the aluminium would be redesolved. The other major contaminant would be sodium carbonate which I believe would also be removed if using membranes - requiring a top up of the caustic solution...
  5. capral

    Caustic Soda Recovery

    I am currently researching methods to recover a spent sodium hydroxide solution used to dissolve aluminium from extrusion dies. We have two 900L tanks of 25% NaOH and one 900l rinse tank. When the aluminium concentration reaches about 20-30g/L, the spent solution is dumped (handled by...
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