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为了提高湿法浸出低钒钢渣中钒的浸出率,并为湿法浸出低钒钢渣中钒提供理论依据,从动力学角度分析整个浸出过程,并考察温度、液/固比、浸出时间和搅拌速度对浸出过程的影响。结果表明,在90℃,液/固比为10:1以及4.0mol/L盐酸,过氧化氢8.0mL,浸取90min条件下,低钒钢渣中钒的浸出率可达到98.8%。通过正交实验和动力学推导,得到描述浸出过程的经验方程。低钒钢渣湿法浸出钒的动力学模型为未反应收缩核模型,浸出过程的表观活化能为7.21kJ/mol。该模型表明浸出过程中的控制步骤取决于边界层的扩散速度。提高温度、液/固比和浸出时间,均可增加钒的浸出速度,提高钒的浸出率。
In order to improve the leaching rate of vanadium from low vanadium slag by wet leaching and to provide a theoretical basis for wet leaching of vanadium from low vanadium slag, the whole leaching process was analyzed from the kinetic point of view, and the effects of temperature, liquid / solid ratio, leaching time and stirring Effect of velocity on leaching process. The results showed that the leaching rate of vanadium in low vanadium slag reached 98.8% at 90 ℃, liquid / solid ratio of 10: 1, 4.0 mol / L hydrochloric acid and 8.0 mL of hydrogen peroxide for 90 min. Through orthogonal experiment and kinetic derivation, the empirical equation describing the leaching process is obtained. The kinetic model of vanadium leaching with low vanadium steel slag is an unreacted core model, and the apparent activation energy of the leaching process is 7.21 kJ / mol. The model shows that the control steps in the leaching process depend on the rate of diffusion of the boundary layer. Increasing the temperature, liquid / solid ratio and leaching time can increase the leaching rate of vanadium and increase the leaching rate of vanadium.