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Solvent extraction of vanadium from a H2SO4-HF mixed acids leaching solution of stone coal
LI Xingbin #,WEI Chang *,LI Cunxiong,DENG Zhigan,LI Minting,FAN Gang
Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming 650093
*Correspondence author
#Submitted by
Subject:
Funding: Research Fund for the Doctoral Program of Higher Education of China (No. No. 20115314110001), NSFC (No.Natural Science Foundation of China, Nos. 51474115 and 51304093)), National Basic Research Program of China (No.No. 2014CB643404)
Opened online: 7 November 2014
Accepted by: none
Citation: LI Xingbin,WEI Chang,LI Cunxiong.Solvent extraction of vanadium from a H2SO4-HF mixed acids leaching solution of stone coal[OL]. [ 7 November 2014] http://en.paper.edu.cn/en_releasepaper/content/4616474
 
 
Di (2-ethylhexyl) phosphoric acid (P204) and tri-n-butyl phosphate (TBP) were used to extraction vanadium from a H2SO4-HF mixed acids leaching solution of stone coal in this paper. Effect of different operational factors such as equilibrium pH, extractant concentration, extraction stage, strip solution concentration, phase ratio were examined to optimize the condition for selective and quantitative extraction and stripping of vanadium. Based on the results of extraction as well as stripping isotherm, the extraction of vanadium was quantitative in six stages using 10% P204 and 5% TBP at A:O ratio of 1:1 and equilibrium pH of 2.4; 99.6% percentage stripping of vanadium from the loaded organic phase was obtained by five stage stripping using 1.5 mol/L H2SO4 at A:O ratio of 1:8. In the solvent extraction process, scrubbing is necessary for removing co-extracted and entrainment impurities by dilute sulfuric acid solution, more than 90% iron and arsenic can be scrubbed by 0.2 mol/L sulfuric acid.
Keywords:Solvent extraction; Vanadium; P204; Stone coal
 
 
 

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