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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/5124

Title: Leachability of nitrided ilmenite in hydrochloric acid
Authors: Swanepoel, JJ
Van Vuuren, DS
Heydenrych, M
Keywords: Titanium nitride
Upgraded nitrided ilmenite
Hydrochloric acid leaching
Metallic iron dissolution
Issue Date: Oct-2010
Citation: Swanepoel, JJ, Van Vuuren, DS, and Heydenrych, M. 2010. Leachability of nitrided ilmenite in hydrochloric acid. Light Metals Conference, Misty Hills, Muldersdrift, 27-29 October 2010, pp. 228-238
Series/Report no.: Workflow;4966
Abstract: Titanium nitride in upgraded nitrided ilmenite (bulk of iron removed) can selectively be chlorinated to produce titanium tetrachloride. Except for iron, most other components present during this low temperature (ca. 200 °C) chlorination reaction will not react with chlorine. It is therefore necessary to remove as much iron as possible from the nitrided ilmenite. Hydrochloric acid leaching is a possible process route to remove metallic iron from nitrided ilmenite without excessive dissolution of species like titanium nitride and calcium oxide. Calcium oxide dissolution results in unrecoverable acid consumption. The leachability of nitrided ilmenite in hydrochloric acid was evaluated by determining the dissolution of species like aluminium, calcium, titanium and magnesium in a batch leach reactor for 60 minutes at 90 °C under reflux conditions. The hydrochloric acid concentration (11%, 18% and 25%), initial acid-to-iron mole ratio (2:1, 2.5:1 and 3.3:1), and solid-to-liquid mass ratio (1:8.33 to 1:2.13) were varied. The results indicate that a hydrochloric acid concentration of 25 wt. % supplied in a 2:1 acid-to-iron mole ratio would produce the most favourable upgraded nitrided ilmenite product. The dissolution of iron in this solution reached 97 percent after only 60 minutes. The total dissolution of calcium and titanium species was 0.01 and 0.11 wt. % respectively. Hydrochloric acid can therefore be used as lixiviant to remove metallic iron from nitrided ilmenite.
Description: Light Metals Conference, Misty Hills, Muldersdrift, 27-29 October 2010
URI: http://hdl.handle.net/10204/5124
ISSN: 0038-223X/3
Appears in Collections:Metal and metal processes
General science, engineering & technology

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