ACID REGENERATION PLANT
U200 Acid regeneration system
The spent leach liquor from the pre-concentrator is processed in the spray roaster in which the liquid spray entering the furnace is heated by burning oil. The spent liquor then decomposes to metallic oxides and Hydrochloric acid. The Hydrochloric acid vapour is first cooled in the pre-concentrator and then absorbed in the wash liquor generated in the IBP.
4FeCl2 + 4H2O + O2 = 2Fe2O3 + 8HCl
2FeCl3 + 3H2O = Fe2O3 + 6HC