Dechlorination of ferric chloride with oxygen
Because of increasing ecological concern, the Bureau of Mines is investigating the use of chlorination technology in extractive metallurgy. A key problem is the fact that ferric chloride is commonly generated during processing of a wide variety of ores and minerals. This paper describes small laboratory-scale studies designed to effect dechlorination of ferric chloride by oxygen in a fluidized bed reactor to produce a viable, nonpolluting iron oxide product and chlorine gas, which could be recycled in a chlorination process. These studies demonstrated that close to 100 pct conversions of ferric chloride to ferric oxide and chlorine can be effected by reaction with oxygen at temperatures ranging from 500° to 650°C. The off-gas from the single-stage reactor contained up to 95 pct chlorine. The study also demonstrated that the presence of a small amount of NaCl in the reactor catalyzed the reaction between ferric chloride and oxygen and permitted high conversions at temperatures as low as 500°C.
KeywordsFeed Rate Ilmenite Ferric Chloride Oxygen Flow Rate Titanium Tetrachloride
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