Title: Study on Separation of Vanadium and Impurities from Acid Leach Supernatant of Vanadium-containing Stone Coal
Abstract: The vanadium-containing supernatant,after acid leaching of some stone coal from Shaanxi Province,was firstly pretreated by being neutralized with lime milk and reduced with sodium thiosulfate.Then,a combination of P204+TBP+sulfonated kerosene was used for extraction and concentration,obtaining leach liquor of vanadium pentoxide.At last,sulfuric acid with different acidity was used as stripping agent in back-extraction of load organic phase for separation between vanadium and iron.Tests results showed that after the supernatant was pretreated by neutralization with lime milk and reduction with sodium thiosulfate,the solution was controlled at a pH of 2.5,with an electric potential of-200 mV.After six-stage countercurrent extraction at A/O=2,the vanadium extraction rate was more than 99% while the iron extraction rate only 11%.When the acidity of stripping agent was controlled within 1.0-1.25 mol/L,5-stage countercurrent back-extraction at O/A=18 resulted in back-extraction rate of over 99% and 9% for vanadium and iron,respectively.The concentration of V2O5 and Fe in the liquid phase after back-extraction is 75.3 g/L and 1.2 g/L,respectively,with the mass ratio of vanadium to iron being 62.8,which can meet the requirement for the follow-up process.
Publication Year: 2013
Publication Date: 2013-01-01
Language: en
Type: article
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