Solvent Extraction of tetravalent titanium from chloride and nitrate solutions by 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (EHEHPA) in Kerosene

The extraction of titanium (IV) from chloride, and nitrate solutions has been studied using 2- ethylhexyl phosphonic acid mono-2-ethylhexyl ester (EHEHPA) in kerosene as a solvent. The effect of acid concentration on extraction examined and it has been specified when concentration in aqueous solution (feed) is varied from 0.5-4 mol L-1, the distribution ratios of titanium showed minimal values at 1-2 mol L-1 acid. The distribution ratio of titanium (IV) increases with the extractant concentration in the organic phase. The extraction of titanium (IV) has been done in presence of other metal ions viz. iron (III), silicon (IV), calcium (II), magnesium (II), manganese (II) and aluminum (III) which are associated with titanium in the titaniferous magnetite. At the next stage, the stripping of titanium was studied using H2SO4, H2SO4+H2O2 and Na2CO3. The kinetics of the stripping was very slow when sulphuric acid was used, but it was improved with complex forming stripping agents (H2SO4+H2O2) and Na2CO3. The titanium recovery was 97% using aqueous nitrate medium as an extractant and sodium carbonate as a stripper. Third phase formation was observed during extraction stage

Author(s): A. Borsalani1, H. Ghahremani2 , S. Seyfi3 and M. Abdi3

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