Environmentally friendly approach to recover vanadium and tungsten from spent SCR catalyst leach liquors using Aliquat 336.

However, the extraction followed an adverse trend, 99.79% to 50.24% and 95.9% to 39.93% for vanadium and tungsten, respectively, when equilibrium pH increased ( Fig. 3 ).

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While increasing chloride ion concentration from 0.025 mol L −1 to 1.0 mol L −1 , the efficacy in the extraction of vanadium showed a decreasing trend, i.e. , from 65.37% to 57.24%, whereas tungsten extraction decreased from 57.63% to 46.66%.

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