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Thermodynamic Analysis of Phosphorus-Sulfur-Vanadium- Water Acidic System for the Extraction of Vanadium
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1.School of Metallurgy, Northeastern University, Shenyang 110819, China;2.Key Laboratory of Ecological Metallurgy of Multi-metal Intergrown Ores of Ministry of Education, Shenyang 110819, China

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Fundamental Research Funds for the Central Universities (N182504018); National Natural Science Foundation of China (51874078); Fund of Liaoning S&T Project (20180551008)

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    Abstract:

    To extract vanadium efficiently from the acidic leachate of vanadium slag, a thermodynamic analysis of phosphorus-sulfur-vanadium-water acidic systems was established at 298 K. Results show that in the P(V)-V(V)-H2O acidic system, VO2+ is first conver-ted to phosphovanadic heteropolyacid ions when pH=1~4 and then converted to vanadium isopolyacid ions when pH=4~7. In the S(VI)-V(V)-H2O acidic system, VO2+ and VO2SO4- are the main existing chemical forms when pH=0~1 and gradually converted to vanadium isopolyacid ions when pH=2~6. In the P(V)-S(VI)-V(V)-H2O acidic system, when pH=1~3, VO2+ and VO2SO4- are gradua-lly converted to phosphovanadic heteropolyacid ions. The optimum molar fraction of ΣPV14 (total sum of phosphovanadic heteropolyacid ions) reaches 88.55% at pH=2. As the pH value increases to 4~6, phosphovanadic heteropolyacid ion gradually disappears and is converted to vanadium isopolyacid anions, and the optimum molar fraction of ΣV10 (total sum of vanadium isopolyacid ions containing ten vanadium) is 100.00% at pH=5.

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[Zhang Weiguang, Zhang Tingan, Sun Ying, Lv Guozhi, Cao Xuejiao. Thermodynamic Analysis of Phosphorus-Sulfur-Vanadium- Water Acidic System for the Extraction of Vanadium[J]. Rare Metal Materials and Engineering,2021,50(12):4265~4271.]
DOI:10.12442/j. issn.1002-185X. E20200046

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History
  • Received:September 20,2020
  • Revised:November 12,2020
  • Adopted:December 07,2020
  • Online: December 30,2021
  • Published: December 24,2021