湿法酸浸锌渣硫酸熟化-富氧氯化浸出提取铅、银的实验研究（英文）

发布时间：2021-05-16 01:35

　　常规湿法炼锌过程中会产生大量的酸浸渣,该残渣含有大量各种有价值的金属。本研究的目的是评估使用硫酸熟化、水浸和氯化浸出（吹氧技术）回收铅和银的能力,接着通过冷却结晶并用铅片置换出银,实现酸浸锌渣中所有有价金属的全面回收,该工艺取得了良好的效果。条件实验研究得出最佳工艺条件如下:硫酸用量为原样质量的70%,焙烧温度300°C,焙烧时间2 h,焙烧渣按液固比5 1室温水浸1h,此时锌、铁的浸出率最高（锌:98.69%,铁:92.36%）。氯化浸出系统主要参数如下:Cl^-浓度300 g/L,Fe³⁺浓度25 g/L,酸浓度2 mol/L,液固比9 m L 1 g,温度90°C,浸出时间0.5 h,该条件下铅和银浸出率分别高达98.87%和96.74%;最后,对在富氧介质下使用Cl-浸出银进行动力学研究,发现浸出过程受内扩散控制,活化能为19.82 k J/mol。 

【文章来源】：Journal of Central South University. 2020,27(12)EISCICSCD

【文章页数】：14 页

【文章目录】：
1 Introduction
2 Experimental
    2.1 Materials
    2.2 Experimental procedure
        2.2.1 Process and reactions
        2.2.2 Sulfation roasting and water leaching
        2.2.3 Oxygen-rich chlorination leaching
    2.3 Analytical methods
3 Results and discussion
    3.1 Sulfation roasting
        3.1.1 Influence of roasting temperature
        3.1.2 Influence of sulfuric acid dosage
        3.1.3 Influence of roasting time
    3.2 Characterization of raw material and sulfation roasting residue
    3.3 Oxygen-rich chlorination leaching
        3.3.1 Effects of Cl-ion concentration
        3.3.2 Effects of liquid-to-solid ratio
        3.3.3 Effects of Fe3+ion concentration
        3.3.4 Effects of acidity
        3.3.5 Characterization of chlorination leaching residue
        3.4 Kinetics of oxygen-rich silver chloride
        3.4.1 Effects of various factors on Ag extent of leaching
        3.4.2 Determination of control steps
        3.4.3 Establishment of mathematical kinetics model
4 Conclusions
Contributors
Conflict of interest


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期刊论文
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