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为了提高湿法浸出低钒钢渣中钒的浸出效率,并对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。考察温度、液固比、硫酸质量分数和搅拌速率对浸出过程的影响。研究结果表明:在90℃、液固比为10?1以及硫酸浓度6.0mol/L时,浸取9h,低钒钢渣中钒的浸出率可达到95.3%。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收缩核动力学模型,浸出过程的表观活化能为12.794kJ/mol,该模型表明浸出过程中的控制步骤取决于固膜扩散速率。提高温度、液固比和硫酸质量分数,均可加速钒的浸出速度,提高钒的浸出率。
In order to improve the leaching efficiency of vanadium in low vanadium slag by wet leaching, and to provide a theoretical basis for leaching vanadium in low vanadium slag by wet leaching, the whole leaching process was analyzed from the viewpoint of kinetics. The effects of temperature, liquid-solid ratio, sulfuric acid concentration and stirring rate on the leaching process were investigated. The results show that the leaching rate of vanadium in the low vanadium slag can reach 95.3% when the liquid-solid ratio is 10? 1 and the concentration of sulfuric acid is 6.0mol / L at 90 ℃ for 9h. The empirical equation describing the leaching process was obtained through orthogonal experiment and kinetic derivation. The kinetic model of wet vanadium leaching from low vanadium steel slag was a contracting nuclear kinetic model. The apparent activation energy of the leaching process was 12.794 kJ / mol. This indicates that the control steps in the leaching process depend on the rate of diffusion of the solid film. Increasing temperature, liquid-solid ratio and sulfuric acid mass fraction can accelerate the leaching rate of vanadium and increase the leaching rate of vanadium.