CAJ | 학술논문

对湿法炼锌净化渣的浸出动力学进行了研究，并探讨了硫酸浓度、反应温度、粒度等对钴、锌浸出率的影响规律。从动力学的角度分析了整个浸出过程，得到优化条件：液固比50：1(mL/g)，硫酸浓度100 g/L，反应温度70°C，粒度75~80μm，反应时间20 min。在此优化条件下钴的浸出率为99.8%，锌的浸出率为91.97%。结果表明：在硫酸体系中钴的浸出符合不生成固体产物层的“未反应收缩核”模型。通过 Arrhenius 经验公式求得钴和锌表观反应活化能分别为11.693 kJ/mol和6.6894 kJ/mol，这表明浸出过程受边界层扩散控制。
대습법련자정화사적침출동역학진행료연구，병탐토료류산농도、반응온도、립도등대고、자침출솔적영향규률。종동역학적각도분석료정개침출과정，득도우화조건：액고비50：1(mL/g)，류산농도100 g/L，반응온도70°C，립도75~80μm，반응시간20 min。재차우화조건하고적침출솔위99.8%，자적침출솔위91.97%。결과표명：재류산체계중고적침출부합불생성고체산물층적“미반응수축핵”모형。통과 Arrhenius 경험공식구득고화자표관반응활화능분별위11.693 kJ/mol화6.6894 kJ/mol，저표명침출과정수변계층확산공제。
The leaching processes of zinc plant purification residue in sulfuric acid solution were investigated with respect to the effects of sulfuric acid concentration, reaction temperature, and particle size. A particle size of 75?80 μm was required to leach 99.8%cobalt and 91.97%zinc at 70 °C for 20 min when the sulfuric acid concentration was 100 g/L and the ratio of liquid to solid was 50?1 (mL/g). The leaching kinetics of zinc plant purification residue in sulfuric acid solution system conformed well to the shrinking core model, and the dissolution rates of cobalt and zinc were found to be controlled by diffusion through a porous product layer. The apparent activation energy values of cobalt and zinc reaction were calculated to be 11.6931 kJ/mol and 6.6894 kJ/mol, respectively, according to the Arrhenius formula equation. The results show that diffusion through the inert particle pores is the leaching kinetics rate-controlling step.