Fe-chloride solutions can be regenerated when Fe is
a) Fe(2+) with classic Pyrohydrolysis (Sprayroaster or Fluid bed). But impurities from the process like Zn, Si, etc. create big troubles.
b) Fe(3+) with “hydrothermal” process - hydrolysis of FeCl3 to Fe2O3 at elevated temperature.
In most cases Fe containing ores or e.g. EAFD contain a mixture of Fe(2+) and Fe(3+), in this case Fe(2+) must be oxidized prior to hydrolysis.
Pureox provides new (protected) process for oxidation of Fe(2+) to Fe(3+) which is much more efficient and economic than other oxidation technologies