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N263萃取分离锌铁及其热力学研究

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丁家杰, 谈定生, 王俊杰, 陈哲, 李启文, 杨健, 丁伟中. N263萃取分离锌铁及其热力学研究[J]. 矿产保护与利用, 2021, 41(4): 70-77. doi: 10.13779/j.cnki.issn1001-0076.2021.04.009
引用本文: 丁家杰, 谈定生, 王俊杰, 陈哲, 李启文, 杨健, 丁伟中. N263萃取分离锌铁及其热力学研究[J]. 矿产保护与利用, 2021, 41(4): 70-77. doi: 10.13779/j.cnki.issn1001-0076.2021.04.009
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DING Jiajie, TAN Dingsheng, WANG Junjie, CHEN Zhe, LI Qiwen, YANG Jian, DING Weizhong. Extraction Separation of Zinc and Iron with N263 and Its Thermodynamics[J]. Conservation and Utilization of Mineral Resources, 2021, 41(4): 70-77. doi: 10.13779/j.cnki.issn1001-0076.2021.04.009
Citation: DING Jiajie, TAN Dingsheng, WANG Junjie, CHEN Zhe, LI Qiwen, YANG Jian, DING Weizhong. Extraction Separation of Zinc and Iron with N263 and Its Thermodynamics[J]. Conservation and Utilization of Mineral Resources, 2021, 41(4): 70-77. doi: 10.13779/j.cnki.issn1001-0076.2021.04.009
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N263萃取分离锌铁及其热力学研究

  • 1.

    上海大学 材料科学与工程学院, 上海 200444

  • 2.

    上海大学省部共建高品质特殊钢冶金与制备国家重点实验室, 上海 200444

详细信息
    作者简介: 丁家杰(1995-), 男, 陕西省安康市人, 硕士研究生, 主要研究方向为湿法冶金
    通讯作者: 谈定生(1963-), 男, 博士, 副教授, 主要研究方向为湿法冶金。E-mail: tds1963@163.com

  • 中图分类号: TF803.2+3

Extraction Separation of Zinc and Iron with N263 and Its Thermodynamics

  • 1.

    School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China

  • 2.

    State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200444, China

More Information

    摘要

  • 研究了用N263从氯化物体系中萃取Zn2+、Fe2+和Fe3+，考察了振荡时间、萃取剂浓度、改性剂浓度、相比（O/A）、盐酸浓度对Zn2+、Fe2+和Fe3+萃取率的影响。结果表明，在有机相组成为20% N263+20%正己醇+60% 260#溶剂油、相比O/A=1 GA6FA 1、振荡时间5 min和25℃条件下，Zn2+、Fe2+和Fe3+的单级萃取率分别为90.97%、0.79%和75.85%，分离系数βZn2+/Fe2+和βZn2+/Fe3+分别为1 260和3.21。经过2级逆流萃取，水相中Zn2+浓度从9.61 g/L降至0.36 g/L，负载有机相采用0.5 mol/L H2SO4反萃，Zn2+的反萃率为41.86%，Fe3+的反萃率大于97%。N263萃取金属离子的机理是阴离子交换反应，计算了萃取反应相关的热力学函数值，结果表明，N263萃取Zn2+为放热反应，Fe3+的萃取反应为吸热反应，常温下Zn2+和Fe3+的萃取反应均可自发进行。

    The extraction of zinc and iron with N263 from chloride solution was studied. The effects of oscillation time, extractant concentration, modifier concentration, phase ratio(O/A), and hydrochloric acid concentration on the extraction rate of zinc and iron were investigated. The results showedthe extraction rate of Zn2+, Fe2+ and Fe3+ were 90.97%, 0.79% and 75.85%, respectively, and the separation coefficient of βZn2+/Fe2+and βZn2+/Fe3+ were 1 260 and 3.21, respectively, under the conditions of extractant composition of 20% N263+20% n-hexanol+60% 260# solvent oil, phase ratio(O/A) of 1 GA6FA 1, oscillation time of 5 min, 25 ℃. Meanwhile, the concentration of zinc in the aqueous phasedecreased from 9.61 g/L to 0.36 g/L by two-stage countercurrent extraction. The stripping rate of Zn2+ was 41.86% and more than 97% of Fe3+ was stripped with 0.5 mol/L sulfuric acid. Additionally, the mechanism of extraction of metal ions by N263 is anion exchange reaction. The extraction equilibrium isotherms of zinc and iron were plotted, and the thermodynamic functions of the extraction reaction were calculated. The results indicated that the extraction of Zn2+ by N263 is exothermic, and the extraction of Fe3+ is endothermic. The extraction of Zn2+ and Fe3+ can proceed spontaneously at room temperature.

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  • 图 1  振荡时间对锌铁萃取率的影响

    Figure 1. 

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    图 2  萃取剂浓度对锌铁萃取率的影响

    Figure 2. 

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    图 3  N263浓度对锌铁分离系数的影响

    Figure 3. 

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    图 4  相比对锌铁萃取率的影响

    Figure 4. 

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    图 5  相比(O/A)对锌铁分离系数的影响

    Figure 5. 

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    图 6  HCl浓度对锌铁萃取率的影响

    Figure 6. 

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    图 7  金属离子的萃取平衡等温线

    Figure 7. 

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    图 8  温度对锌铁萃取率的影响

    Figure 8. 

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    图 9  lgD与T-1的关系

    Figure 9. 

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    表 1  不同浓度正己醇对锌铁萃取率的影响

    Table 1.  Effect of n-Hexanol concentration on extraction of zinc and iron

    正己醇浓度/% 试验现象 萃取率/%
    Zn2+ Fe2+ Fe3+
    5 三相 -
    10 -
    15 92.54 0.64 93.77
    20 两相清澈透亮 90.57 0.73 76.69
    25 84.45 0.79 72.07
    30 81.02 0.70 67.64
    下载: 导出CSV

    表 2  反萃剂的反萃效果

    Table 2.  Stripping effect of different reagents

    反萃剂 试验现象/反萃率
    Zn2+/% Fe3+/%
    H2O 35.06 90.54
    0.1 MNH3·H2O 两相均浑浊且水相
    0.1 MNaOH 呈红褐色
    0.5 MH2C2O4 分相困难，久置后水相底部有白色沉淀
    0.1 MHCl 31.97 90.36
    0.1 MH2SO4 35.90 96.28
    0.5 MH2SO4 41.86 97.64
    1 MH2SO4 28.06 88.85
    下载: 导出CSV

    表 3  萃取时的lgD和T-1之间的拟合直线方程

    Table 3.  The equation of fitting line between lgD and T-1

    元素 方程式 R2
    Zn2+ y1=0.123 46x1+0.954 5 0.979 08
    Fe3+ y3=-1.688 99x3+5.692 61 0.992 96
    下载: 导出CSV

    表 4  N263萃取锌铁的热力学数值

    Table 4.  Thermodynamic functions of N263 extraction of zinc and iron

    元素 lgKex ΔH0/(kJ·mol-1) ΔG0/(kJ·mol-1) ΔS0/(J·mol-1·K-1)
    Zn2+ 2.12 -2.36 -12.10 32.67
    Fe3+ 0.77 32.34 -4.42 123.29
    下载: 导出CSV
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收稿日期:  2021-08-06
刊出日期:  2021-08-25

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