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---水体系酸性溶液中钒的提取热力学分析
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1.东北大学 冶金学院,辽宁 沈阳 110819;2.多金属共生矿生态化冶金教育部重点实验室,辽宁 沈阳 110819

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中央高校基本科研业务专项资金资助(N182504018),国家自然科学基金面上项目(Nos.51874078),辽宁省科技项目资助(20180551008)


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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    摘要:

    针对含钒酸浸液中钒的有效提取问题,研究了298 K时磷-硫-钒-水溶液酸性体系中钒的提取热力学分析过程。结果表明,在 P(V)-V(V)-H2O酸性溶液体系中,pH=1~4时VO2+首先转变为磷钒杂多酸阴离子,pH=4~7时磷钒杂多酸阴离子转变为同多酸阴离子;在S(VI)-V(V)-H2O酸性溶液体系中,pH=0~1时钒主要以VO2+和 VO2SO4-形式存在,pH=2~6时钒逐渐转变为同多酸阴离子;在P(V)-S(VI)-V(V)-H2O酸性溶液体系中,pH=1~3 时VO2+和 VO2SO4-逐渐转变为磷钒杂多酸阴离子,当pΗ=2时ΣPV14(所有磷钒杂多酸阴离子之和)的摩尔分数最大为88.55%;pH=4~6 时,磷钒杂多酸阴离子消失并逐渐转变为同多酸阴离子,当pΗ=5时ΣV10(所有同多酸阴离子之和)的摩尔分数最大为100.00%。

    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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张伟光,张廷安,孙颖,吕国志,曹雪娇.磷---水体系酸性溶液中钒的提取热力学分析[J].稀有金属材料与工程,2021,50(12):4265~4271.[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.]
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历史
  • 收稿日期:2020-09-20
  • 最后修改日期:2020-11-12
  • 录用日期:2020-12-07
  • 在线发布日期: 2021-12-30
  • 出版日期: 2021-12-24