Image talk:Moving bed reactor; zoom on ions.png

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To my opinion the stream going from raw solution to concentrated solution is confusing since it moves in opposite direction as the aqueous flow. I therefore think it is better to remove that arrow since it is only the solid ion exchanger that is transporting the Cu2+ ions.--Åke Sandström 14:30, 22 February 2008 (CET)

  1. Distribution of ions in moving bed columns (half-reactors) is not so simple because the sorption front occupies almost the whole length. So, I would diffuse grains of different colours along the columns. Andrei
    1. Now the front it is more diffused in both half-reactors. --Anna Bauer 14:51, 10 December 2007 (CET)
  2. Why do you write Fe2+? Isn't iron oxidised to Fe3+? Andrei
    1. I have exchanged Fe(II) to Fe(III) but I think anykind would do, depending on the redox and pH of the solution:
      • At basic pH: Fe(II) and Fe(III) insoluble
      • At neutral pH: Fe(II) is chemically stable if oxygen is not present. Fe(III) is insoluble
      • pH<3 makes Fe(II) chemically stable in solution
      • --Anna Bauer 14:51, 10 December 2007 (CET)
  3. If you want to have Cu2+ and Fe3+ ions, distribution of Fe3+ in the left column will be much shorter than Cu2+ and vise versa; i.e. Fe3+ will be much wider spread along the right column (do you need such details?:))Andrei
    1. Actually, this time I have avoided the problem since the rinsing step could actually wash out bound Fe(III) but still let Cu(II) stay bound. But it could be a point to have two pictures, one with your suggestions (which probably is more relevant if the purpose is to purify water); the other where Fe(III) is removed in the rinsing step (If purpose is to purify and concentrate Cu-ions)--Anna Bauer 14:51, 10 December 2007 (CET)
    2. Why would Fe(III) spread wider in the elution-step than the sorption step? --Anna Bauer 14:51, 10 December 2007 (CET)

Continuous IE system operating at commercial scale in biohydrometallurgy industry?

  • According to user:Francisco Sanchez: We have been looking if any continuous IE system is currently (2007) in operating at commercial scale; we have only found a process mainly for water treatment.
    • But what about the Higgins contactor then: In this presentation. they claim to use it as an alternative to Solvent Extraction. They also say that it is used in the Chemical, Mining, Nuclear & Municipal Industries. --Anna Bauer 14:36, 11 December 2007 (CET)
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