CAJ | 학술논문

研究了转炉渣中钴氧压硫酸体系选择性浸出过程的行为及其动力学。通过改变搅拌速度、反应温度、硫酸浓度、氧分压、物料粒度以及反应时间等浸出条件，考察钴浸出率的变化及影响，获得转炉渣中钴的浸出动力学规律。结果表明，钴的浸出率随着温度、酸度、氧分压的增加而增加；硫酸质量浓度大于0.4 mol·L–1会导致铁大量溶出；浸出过程符合未反应芯收缩核模型，前期受化学反应控制，然后转变为混合控制，后期受固体产物层扩散控制。化学反应控制和固体产物层扩散控制过程的活化能分别为43.19 kJ·mol–1和10.49 kJ·mol–1。化学反应控制过程对硫酸浓度、氧分压及粒度的反应级数分别为0.79、0.85和–0.95。
연구료전로사중고양압류산체계선택성침출과정적행위급기동역학。통과개변교반속도、반응온도、류산농도、양분압、물료립도이급반응시간등침출조건，고찰고침출솔적변화급영향，획득전로사중고적침출동역학규률。결과표명，고적침출솔수착온도、산도、양분압적증가이증가；류산질량농도대우0.4 mol·L–1회도치철대량용출；침출과정부합미반응심수축핵모형，전기수화학반응공제，연후전변위혼합공제，후기수고체산물층확산공제。화학반응공제화고체산물층확산공제과정적활화능분별위43.19 kJ·mol–1화10.49 kJ·mol–1。화학반응공제과정대류산농도、양분압급립도적반응급수분별위0.79、0.85화–0.95。
The dissolution kinetics and behavior of cobalt extraction from low nickel matte converter slag by pressure oxidative leaching with sulfuric acid were investigated. The effects of stirring speed, temperature, sulfuric acid concentration, oxygen partial pressure and particle size on extraction rate of cobalt were studied for exploring the kinetics law of cobalt dissolution from the slag. The experimental results showed that the extraction efficiency of cobalt increased with the increases of temperature, sulfuric acid concentration and oxygen partial pressure, but the sulfuric acid concentration above 40 g·L–1 can cause an increase of iron extensive dissolving in the solution. The stirring speeding above 700 r·min–1, oxygen partial pressure beyond 650 kPa and particle size of less than 74μm were found to have no effect on the extraction of cobalt. The dissolution kinetics analysis of the experimental data based on the shrinking core model for various conditions indicated that the reaction rate of leaching was mainly controlled by the chemical reaction during its early stages, then switched to be controlled by mixed chemical-reaction and product-layer diffusion, and finally was controlled solely by diffusion through a surface product layer in the later stage. The activation energy was calculated to be 43.19 kJ·mol–1 in the early surface chemical reaction controlled stage and 10.49kJ·mol–1 in the later diffusion controlled stage, respectively. In the chemical reaction controlled stage, the reaction orders with respect to sulfuric acid concentration, oxygen partial pressure and particle size are 0.79, 0.85and –0.95,respectively.