钒铬还原渣碱浸提钒工艺及其动力学

采用常压下空气氧化-碱浸工艺，对钒冶炼的钒铬还原渣进行提钒. 通过正交实验考察了碱浓度、浸出温度、液固比对钒浸出率的影响，研究了钒的浸出动力学. 结果表明，最佳条件为碱浓度100 g/L、浸出温度100℃、液固比4 mL/g、浸出时间1 h. 该条件下钒浸出率最高达98%. 钒的浸出过程符合核收缩模型，受扩散步骤控制，表观活化能为11.04 kJ/mol.

Leaching Technology and Kinetics of Vanadium from Vanadium and Chromium-bearing Slag by Alkaline Process

Vanadium was extracted from vanadium and chromium-bearing slag from the vanadium smelting process by air oxidation process and alkaline leaching process under atmospheric pressure. The effects of alkali concentration, leaching temperature, ratio of liquid to solid on the leaching rate of vanadium by orthogonal experiments were examined, and the leaching kinetics was also studied. The results showed that the optimum leaching conditions were the NaOH concentration of 100 g/L, leaching temperature 100℃, ratio of liquid to solid 4 mg/L and leaching time 1 h. Under the conditions, the leaching rate of vanadium reached 98%. Vanadium leaching process was in line with nuclear shrinkage model, the leaching process was controlled by diffusion step, and the apparent activation energy was 11.04 kJ/mol.