Study on speciation analysis of vanadate
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摘要: 在钒渣钙化焙烧-酸浸工艺中，产生的浸出液含有较多的杂质，其含钒相的变化情况会直接影响钒的总体回收率。在不同条件下，测定钒相在浸出过程中的迁徙和转变是一个巨大的挑战，因此研究了不同条件对钒形态的影响和转化规律。采用软件Visual MINTEQ 3.1模拟计算多钒酸结构的变化情况，为不同pH下沉钒提供了理论基础。使用基质辅助激光解吸飞行时间质谱仪(MALDI-TOF-MS)检测钒存在形态。测试结果表明，pH值较低时，V10O286−是主要物质，随着pH值的增加，VO3−、V4O124−的含量增加，成为主要物质之一；浓度导致相对含量发生了变化，浓度越低，VO3−含量越少，V10O286−含量越多；不同阴阳离子对钒形态影响不显著。此结果丰富了钒形态研究，为钒渣中钒元素的定向转化提供了理论基础，同时也为后续沉钒工艺提供了依据，提升转炉钒渣提钒效率。
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关键词:
- 提钒 /
- 钒酸盐 /
- 形态分析 /
- 质谱仪 /
- Visual MINTEQ 3.1模拟
Abstract: In the typical calcium calcination–acid leaching process of converter vanadium slag, the leaching solution contains many impurities, and the change of vanadium phase in this process will directly affect the overall recovery rate of vanadium. It is a great challenge to determine the migration and transformation of vanadium phase in the leaching process under different conditions. Therefore, the effects of different conditions on vanadium speciation and transformation rules were studied. The results show that the software Visual MINTEQ 3.1 simulates and calculates the structural change of polyvanadate, which provides a theoretical basis for the precipitation of vanadium at different pH. The matrix assisted laser desorption time-of-flight mass spectrometer (MALDI-TOF-MS) was used to detect the existing form of vanadium. The test results showed that when the pH value was low, V10O286−was the main substance. With the increase of the pH value, the content of VO3− and V4O124− increased and became one of the main substances. The concentration causes changes of the relative content, i.e., the lower the concentration, the less the VO3− content and the more the V10O286− content, while different anions and cations have no significant effect on vanadium morphology. This result enriches the study of vanadium morphology, provides a theoretical basis for the directional conversion of vanadium elements in vanadium slag, and also provides a basis for the subsequent vanadium precipitation process to improve the vanadium extraction efficiency of converter vanadium slag. -
图 4 不同酸调节溶液pH=2 质谱
Figure 4. Mass spectra of different acid regulating solutions (pH=2)
图 6 pH=2 一价金属阳离子钒酸盐质谱
Figure 6. Mass spectra of monovalent metal cation vanadate with pH=2
图 12 不同浓度NaVO3溶液质谱
Figure 12. Mass spectra of NaVO3 solution of different concentrations
图 13 pH=3时，不同浓度NaVO3溶液质谱
Figure 13. Mass spectra of NaVO3 solution of different concentrations (pH=3)
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