Abstract In this study, the enhanced extraction of zinc from a blast furnace dust (BFD) ammonia leaching solution via carbon dioxide (CO2) was investigated. 1-Benzoyl-2-nonyl ketone (commercially known as Mextral54–100) and tri-alkyl phosphine oxide (TRPO) were used as the extractant and synergistic extractant, respectively. The effects of different operational factors, such as the CO2 pressure, extractant concentration, phase ratio, and extraction temperature, were examined to optimize selective and quantitative zinc extraction. The loaded organic phase was stripped using sulfuric acid and waste electrolyte. Quantitative zinc extraction was achieved in two stages using 1.2 mol/L Mextral54–100 and 0.2 mol/L TRPO at an initial pH of 8.0, CO2 at 0.2 MPa, and an aqueous:organic (A:O) ratio of 2:1. The loaded organic phase, which contained 0.08 mol/L zinc, could be stripped in a single stage using 1.6 mol/L H2SO4 at a phase flow ratio of A/O = 1:1 to create a loaded strip solution that contained 5.5 g/L zinc. Zinc extraction from BFD with the ammonia leaching solution was enhanced by CO2 addition. Fourier-transform infrared spectroscopy confirmed that CO2 could prevent the co-extraction of ammonia into the synergistic system of the Mextral54–100/TRPO mixture. Based on the experimental results, a flowsheet for the recovery of zinc from BFD was developed and tested. The extents of zinc leaching, extraction, and stripping were ~ 91%, 97%, and 99%, respectively.

中文翻译：

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二氧化碳在高炉烟尘氨浸液中溶剂萃取锌的强化作用

摘要 在这项研究中，研究了通过二氧化碳 (CO2) 从高炉粉尘 (BFD) 氨浸出溶液中强化提取锌。1-苯甲酰基-2-壬基酮（商业上称为 Mextral54-100）和三烷基氧化膦（TRPO）分别用作萃取剂和协同萃取剂。研究了不同操作因素（如 CO2 压力、萃取剂浓度、相比和萃取温度）的影响，以优化选择性和定量锌萃取。使用硫酸和废电解质汽提负载的有机相。使用 1.2 mol/L Mextral54–100 和 0.2 mol/L TRPO 在初始 pH 值为 8.0、CO2 为 0.2 MPa 和水：有机物 (A:O) 比为 2:1 的情况下，分两个阶段实现定量锌提取。加载的有机相，其中含有 0。08 mol/L 锌，可以使用 1.6 mol/L H2SO4 以 A/O = 1:1 的相流比在单个阶段中进行汽提，以创建含有 5.5 g/L 锌的负载汽提溶液。通过添加 CO2 增强了用氨浸出溶液从 BFD 中提取锌。傅里叶变换红外光谱证实，CO2 可以防止氨共萃取到 Mextral54-100/TRPO 混合物的协同系统中。根据实验结果，开发并测试了从 BFD 中回收锌的流程图。锌浸出、提取和溶出的程度分别为~91%、97%和99%。通过添加 CO2 增强了用氨浸出溶液从 BFD 中提取锌。傅里叶变换红外光谱证实，CO2 可以防止氨共萃取到 Mextral54-100/TRPO 混合物的协同系统中。根据实验结果，开发并测试了从 BFD 中回收锌的流程图。锌浸出、提取和溶出的程度分别为~91%、97%和99%。通过添加 CO2 增强了用氨浸出溶液从 BFD 中提取锌。傅里叶变换红外光谱证实，CO2 可以防止氨共萃取到 Mextral54-100/TRPO 混合物的协同系统中。根据实验结果，开发并测试了从 BFD 中回收锌的流程图。锌浸出、提取和溶出的程度分别为~91%、97%和99%。