Efficient Extraction of V(V) in Aqueous Solution by Microemulsion System

Abstract

Vanadium slag is the main raw material to produce vanadium product. The mainstream approach that has been used to extract vanadium from vanadium slag is roasting–leaching. The above leaching solution through precipitation of ammonium polyvanadate (APV), APV-precipitated wastewater was produced. APV-precipitated wastewater contains a certain concentration of vanadium, which needs to require further treatment. In this research, we put forward an efficient method for the extraction of V(V) in aqueous solution using an Aliquat 336/isoamyl alcohol/n-heptane/NaCl microemulsion system. Suitable conditions of extracting vanadium in aqueous solution were studied, including surfactant concentration, the volume ratio of aqueous phase to microemulsion, as well as contacting time. And the extraction mechanism on the microemulsion system has been researched. Extraction of V(V) in APV-precipitated wastewater by microemulsion system also has been investigated; the extraction ratio of V can reach to 99.74%.