| 摘要 |
This invention is directed to the oxidation of ferrous chloride in liquid aqueous solution, such as, waste HCl pickle liquor, to a solution containing ferric chloride, by intimately intermingling said ferrous chloride solution with free oxgyen in the presence of a dissolved promoter cation selected from the class consisting of ammonium, chromium, cobalt, copper, manganese, nickel, zinc and mixtures thereof at an elevated temperature between about 120 DEG -500 DEG F. for a time sufficient to obtain a ferric chloride containing solution. The invention is also directed to producing hydrochloric acid from ferric chloride solution in water by heating the liquid solution at a temperature of about 250 DEG -400 DEG F. at subatmospheric pressure, preferably, by means of hot submerged combustion gases, to obtain a hydrogen chloride gas-water vapor mixture and a bottoms aqueous slurry of iron oxide.
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