Abstract
The recovery of titanium from the sulphuric acid leach of a titaniferous magnetite ore by solvent extraction has been investigated in two mini-plant campaigns. The leach liquor contained approximately 5 g l −1 titanium, 1 g l −1 vanadium, and 55 g l −1 iron in 75 g l −1 sulphuric acid. The objective was to achieve the maximum possible titanium recovery with maximum rejection of iron and vanadium. The organic phase comprised 10 vol.% tri- n-octylphosphine oxide (TOPO) in an aliphatic diluent. Stripping was effected using sulphuric acid. The first continuous counter-current mixer–settler mini-plant employed mixers of 100 ml capacity and was operated for 180 h. A larger mini-plant of 500 ml mixer capacity was subsequently commissioned and operated for 102 h. The degree of titanium extraction varied between 76 and 88%. Vanadium co-extraction was negligible (less than 1%), while the iron concentration in the loaded strip liquor was reduced to less than 2 g l −1. Approximately 60% of titanium loaded onto the organic phase was stripped, while 97% of the iron and 76% of the vanadium were stripped.
Published Version
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