The effect of tributyl phosphate on the extraction of nickel(ii) and cobalt(ii) ions with di(2-ethylhexyl)phosphoric acid.

Abstract

The paper presents the results of studies on the extraction of nickel(II) and cobalt(II) ions from sulphate solutions with di(2-ethylhexyl)phosphoric acid (D2EHPA). As the modifier of extracting capacity, tributyl phosphate (TBP) was used. The obtained experimental results indicate that a high excess of TBP in relation to D2EHPA reduces the extracting capacity of the latter, whereas its small amount (in a proportion of 1:1) improves the extraction of nickel(II) ions, while not affecting the extraction of cobalt(II) ions.