text: *Furnace Type (spray roaster, fluidised bed or combined furnace)
  *Physical Properties of Iron Oxide By-Product (ferric oxide powder or pellets)
  *Purity and commercial value of Iron Oxide By-Product
  **Cl content
  **SiO content (typically 40 to 1000 ppm)
  **other impurities
  **specific weight (typically 0.3 to 4 kg per litre)
  **specific surface (typically 0.01 to 8 m2/g)
  *Energy Consumption (between 600 and 1200 kcal/L)
  *Fuel type
  *Concentration of regenerated acid (typically approx. 18% wt/wt)
  *Purity of regenerated acid (remaining Fe content, Cl content)
  *Recovery efficiency (typically 99%)
  *Rinse water utilization
  *Stack emissions (HCl, Cl, Dust, CO, NOx)
  *Liquid effluents (composition, amount)