C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 34/32 (2006.01) C01B 9/02 (2006.01) C01G 1/06 (2006.01) C22B 1/08 (2006.01) C22B 34/12 (2006.01)
Patent
CA 2418546
A method for increasing the chrome to iron ratio of chromite product selected from the group consisting of ore and ore concentrate comprising the steps of contacting a mixture of the chromite product, a salt such as NACl or any other adequate salt or combination of salts, chlorine and carbon monoxide in a reactor maintained at a temperature between about 250° and about 750° C whereby a portion of iron oxide in converted into gaseous iron chloride. In specific embodiments, the mwthod may comprise any of the following steps;the excess of chlorine gas leaving the reactor is contacted with scrap of iron metal in a washing tower and transformed in aqueous iron chloride, the condensed iron chloride is washed from the condenser and mixed with the iron chloride flux exiting the washing tower and reacted with NaOH to produce NaCl which is subsequently electrolyzed to NaOH and Cl2 which are recycled in the process as reagents, the unreacted carbon monoxide is burned with air to yield carbon dioxide. The solid material produced, with a high chrome to iron ratio, is useful as a starting material for the production of enriched ferrochromium.
Bergeron Mario
Richer-Lafleche Marc
Bergeron Mario
Goudreau Gage Dubuc
Institut National de La Recherche Scientifique
Richer-Lafleche Marc
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