process for the production of an aqueous solution of iron iii chloride

摘要

Prepn. of FeCl3 in aq. soln. involves: (a) contacting aq. HCl with an Fe ore, in molar ratio Fe3O3/HCl 1:6 until the disappearance of HCl; (b) decanting and recovering the supernatant aq. soln. of FeCl3; (c) in presence of the prod. decanted in (b), contacting fresh aq. HCl with a fresh amt. of Fe ore, in molar ratio Fe2O3/HCl of 1:6, until the disappearance of the HCl, and decanting and recovering the supernatant aq. soln. of FeCl3; (d) repeating operation (c) n times; (e) in a final stage, contacting the prod. decanted in the penultimate stage with aq. HCl, so that the molar ratio of HCl/Fe2O3 used in (a) is 6:1; and (f) filtering the final suspension.