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钒渣钠化焙烧过程低价钒氧化不充分,不能被浸出,降低了钒渣的浸出率。实验采用蒽醌磺酸钠(ADA)和栲胶作载氧体实现氧的传递,强化低价钒的氧化行为。通过X射线衍射、扫描电镜、紫外光谱以及紫外可见漫反射光谱等检测方法,分析了转炉钒渣浸出反应前后物相变化行为,探索了反应过程机理,证实了其可行性。结果表明,采用ADA和栲胶作载氧体,能将转炉钒渣中的低价钒氧化成可溶的高价钒,实现空气催化氧化高效浸钒。此时,钒浸出率由89.47%分别提高到92.84%和93.64%,且催化剂对体系后续工艺没有不良影响,转炉钒渣中的尾渣含钒量由1.1%分别降至0.52%和0.47%。
Vanadium slag sodium roasting process of low vanadium oxidation is not sufficient, can not be leached, reducing the vanadium slag leaching rate. In the experiment, anthraquinone sulfonate (ADA) and xanthan gum were used as oxygen carriers to transport oxygen and to strengthen the oxidation behavior of vanadium. The phase transformation behavior before and after the leaching reaction of vanadium slag was analyzed by X-ray diffraction, scanning electron microscopy, ultraviolet spectroscopy and UV-visible diffuse reflectance spectroscopy. The reaction mechanism was explored and its feasibility was verified. The results show that using ADA and 栲 glue as oxygen carrier can oxidize the vanadium in converter vanadium slag into soluble high valence vanadium, and realize efficient vanadium leaching by air catalytic oxidation. At this point, the leaching rate of vanadium increased from 89.47% to 92.84% and 93.64% respectively, and the catalyst had no adverse effect on the subsequent process of the system. The vanadium content of tailings in the converter vanadium slag dropped from 1.1% to 0.52% and 0.47% respectively.