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钠化钒渣浸取液是水法提钒的必经步骤。在这种钒浸取液中,除钒外还有硅、磷、硫等。钒主要以五价形态存在,而硫主要以S~(2-)形态存在。因此在浸取过程中有氧化还原反应发生。此溶液中必定有以四价状态存在的钒。在提取优质五氧化二钒的工艺中,其中一个重要指标是V(Ⅴ)氧化率>99％,否则就应设法将V(Ⅳ)氧化至V(Ⅴ)。所以要求测定溶液中的四价钒。 本文采用在磷酸介质中用高锰酸钾直接
Sodium vanadium slag leaching solution is an essential step in the Vanadium extraction process. In this vanadium leaching solution, in addition to vanadium there are silicon, phosphorus, sulfur and so on. Vanadium exists mainly in pentavalent form, while sulfur mainly exists in S ~ (2-) form. Therefore, there is redox reaction in the leaching process. There must be vanadium in the tetravalent state in this solution. In the process of extracting high-quality vanadium pentoxide, one of the most important indicators is the V (V) oxidation rate> 99%. Otherwise, V (Ⅳ) should be oxidized to V (Ⅴ). Therefore, the determination of tetravalent vanadium in solution is required. In this paper, using phosphoric acid medium with potassium permanganate directly