本文采用六种有机酸选择性溶解Mo,来自废催化剂的Ni和V,并确定了最有效的酸。然后,关键浸出参数的影响,包括酸浓度,温度,和S/L比,对金属浸出进行了系统的探讨,确定了浸出机理。结果表明,有机酸的浸出能力依次为:草酸>柠檬酸>酒石酸>丙二酸>乙酸>甲酸。酸解和络合分解共同影响金属的浸出过程。其中,Mo的93.07%以上,V的86.64%,用草酸在最佳条件下选择性浸出74.21%的Ni:S/l:1/20,草酸:1.0mol/L,温度:60°C从相关系数来看,由此产生的活化能,和n值,证明Mo和V遵循Avrami溶解反应模型,V浸出由扩散模式控制,钼浸出是通过化学反应和扩散的混合模式控制的。在不同的S/L比和草酸浓度下,两种金属的溶解行为始终符合Avrami动力学模型的线性趋势。
This article employs six organic acids to selectively dissolve Mo, Ni and V from spent catalysts, and the most effective acid is identified. Then, the effects of key leaching parameters, including acid concentration, temperature, and S/L ratio, on metal leaching are systematically explored to determine the leaching mechanism. The results demonstrate that the leaching ability of organic acids followed the order: oxalic acid > citric acid > tartaric acid > malonic acid > acetic acid > formic acid. The leaching process of metals was jointly influenced by acidolysis and complexolysis. Among them, more than 93.07 % of Mo, 86.64 % of V, and 74.21 % of Ni were selectively leached with oxalic acid at the optimum condition: S/l: 1/20, oxalic acid: 1.0 mol/L, temp: 60 °C. From the correlation coefficients, the resulting activation energies, and n values, it was demonstrated that Mo and V followed the Avrami dissolution reaction model, V leaching was controlled by the diffusion mode, and Mo leaching was controlled by a mixed mode of chemical reaction and diffusion. The dissolution behavior of both metals consistently adhered to the linear trend of the Avrami kinetic model under varying S/L ratios and oxalic acid concentrations.