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A process flow diagram illustrating <strong>the</strong> production of FeCl3 based on scrap iron, hydrochloric
acid and chlorine is given in Figure 1.7 below:
14
HCl
Spent liquor
Cl2(g)
Water
Reactor
Scrap
iron
Filtration
Chlorination
H2
(Ferrous Chloride (FeCl2)
Sludge
FeCl3
Figure 1.7: Process diagram - production of FeCl3 based on scrap iron, HCl and chlorine
[CEFIC-INCOPA, 2004 #112]
1.4.2.3 Ferric chloride solution (spent FeCl2 liquor + chlorine)
Reaction:
FeCl2 + ½ Cl2 (g) FeCl3
The spent liquor (FeCl2 + free HCl) recovered from different industries (for example: steel
industry, galvanising industry, wire industry, …) can be added to a reactor with iron to
neutralise free HCl (in case when <strong>the</strong> concentration of free HCl >1 %), and <strong>the</strong>n oxidised to
ferric chloride by chlorine (see Figure 1.7 above) or, alternatively, directly converted into ferric
chloride by chlorination if <strong>the</strong> concentration of free HCl 70 %) in hydrochloric
acid (HCl >33 %). The reaction takes place at <strong>the</strong> temperature of 80 – 120 °C and under ambient
pressure, reaction time being 1 – 2 h.
A process flow diagram illustrating <strong>the</strong> production of FeCl3 based on iron ore and hydrochloric
acid is given in Figure 1.8 below: