常規(guī)濕法煉鋅過程中會(huì)產(chǎn)生大量的酸浸渣,該殘?jiān)写罅扛鞣N有價(jià)值的金屬。本研究的目的是評(píng)估使用硫酸熟化、水浸和氯化浸出（吹氧技術(shù)）回收鉛和銀的能力,接著通過冷卻結(jié)晶并用鉛片置換出銀,實(shí)現(xiàn)酸浸鋅渣中所有有價(jià)金屬的全面回收,該工藝取得了良好的效果。條件實(shí)驗(yàn)研究得出最佳工藝條件如下:硫酸用量為原樣質(zhì)量的70%,焙燒溫度300°C,焙燒時(shí)間2 h,焙燒渣按液固比5 1室溫水浸1h,此時(shí)鋅、鐵的浸出率最高（鋅:98.69%,鐵:92.36%）。氯化浸出系統(tǒng)主要參數(shù)如下:Cl^-濃度300 g/L,Fe³⁺濃度25 g/L,酸濃度2 mol/L,液固比9 m L 1 g,溫度90°C,浸出時(shí)間0.5 h,該條件下鉛和銀浸出率分別高達(dá)98.87%和96.74%;最后,對(duì)在富氧介質(zhì)下使用Cl-浸出銀進(jìn)行動(dòng)力學(xué)研究,發(fā)現(xiàn)浸出過程受內(nèi)擴(kuò)散控制,活化能為19.82 k J/mol。 

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

【文章頁數(shù)】：14 頁

【文章目錄】：
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


【參考文獻(xiàn)】：
期刊論文
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