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化工学报  2015 

低冰镍转炉渣中钴的氧压酸浸行为及其动力学

DOI: 10.11949/j.issn.0438-1157.20150226, PP. 3971-3978

Keywords: 浸取,转炉渣,氧压浸出,动力学,多相反应

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Abstract:

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0.4mol·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43.19kJ·mol-1和10.49kJ·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。

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