应用化学 ›› 2023, Vol. 40 ›› Issue (5): 758-768.DOI: 10.19894/j.issn.1000-0518.230002

• 研究论文 • 上一篇    

Cextrant 230从低品位铜矿H2SO4-NaCl浸出液中选择性提取回收铜

方愈1,2, 况王强2, 邝圣庭2,3(), 廖伍平1,2,3()   

  1. 1.南昌大学化学化工学院,南昌 330031
    2.中国科学院赣江创新研究院,材料与化学研究所,赣州 341000
    3.中国科学院长春应用化学研究所,稀土资源利用国家重点实验室,长春 130022
  • 收稿日期:2023-01-08 接受日期:2023-03-27 出版日期:2023-05-01 发布日期:2023-05-26
  • 通讯作者: 邝圣庭,廖伍平
  • 基金资助:
    中国科学院赣江创新研究院自主部署项目(E055C002);江西省自然科学基金青年基金项目(20212BAB213033);江西省“双千计划”(Jxsq.2020101005)

Selective Extraction and Recovery of Copper from the Leaching of Low-grade Copper Ore by H2SO4-NaCl Solution Using Cextrant 230

Yu FANG1,2, Wang-Qiang KUANG2, Sheng-Ting KUANG2,3(), Wu-Ping LIAO1,2,3()   

  1. 1.School of Chemistry and Chemical Engineering,Nanchang University,Nanchang 330031,China
    2.Institute of Material and Chemistry,Ganjiang Innovation Academy,Chinese Academy of Sciences,Ganzhou 341000,China
    3.State Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China
  • Received:2023-01-08 Accepted:2023-03-27 Published:2023-05-01 Online:2023-05-26
  • Contact: Sheng-Ting KUANG,Wu-Ping LIAO
  • About author:wpliao@gia.cas.cn
    stkwong@gia.cas.cn
  • Supported by:
    Ganjiang Innovation Academy Chinese Academy of Sciences (No.?E055C002), Jiangxi Province Natural Science Foundation(20212BAB213033);Jiangxi “Double Thousand Plan”(Jxsq.2020101005)

摘要:

助浸剂NaCl可提高硫酸在常温常压下浸取低品位复杂铜矿时铜的浸出率,但也形成了含铜的混酸溶液。二(2-乙基己基)-(N-(2-乙基己基)氨基)甲基膦酸酯(Cextrant 230)对混酸(H2SO4+HCl)溶液中Cu2+、Fe3+、Co2+、Mg2+和Al3+的萃取行为进行了研究。结果表明, Cextrant 230对混酸溶液中的Cu2+和Fe3+具有良好的萃取能力和选择性,而对Co2+、Mg2+和Al3+的萃取能力较弱; Cl-可促进Cu2+的萃取,而SO42-和HSO4-对Cu2+的萃取起抑制作用; Cu2+的萃取过程是放热反应; 当水相初始pH值为1.16, ρ(Cl-)为20 g/L时,c(Cextrant 230)=0.60 mol/L对Cu2+的饱和负载容量为13.1 g/L;负载有机相中的Cu2+可用H2SO4完全反萃; 经2级逆流萃取优先除Fe3+,混酸模拟液中的ρ(Fe3+)从0.65 g/L减少至32 mg/L,Cu2+的共萃取率仅1.5%; 再经4级萃取,1级洗涤,3级反萃,可获得纯度大于99.7%的Cu2(OH)2CO3产品,铜收率为98.5%。

关键词: 铜, Cextrant 230, 混酸溶液, 溶剂萃取, 回收

Abstract:

The aid-leaching reagent NaCl can improve the leaching efficiency of copper from low-grade complex copper ore at ambient temperature and pressure, which gives a leach solution containing mixed acids. The extraction of Cu2+, Fe3+, Co2+, Mg2+ and Al3+ from the mixed H2SO4-HCl solutions using di(2-ethylhexyl)[N-(2-ethylhexyl) amino methyl] phosphonate (Cextrant 230) is studied here. Cextrant 230 has better extraction ability and selectivity towards Cu2+ and Fe3+ than Co2+, Mg2+ and Al3+ in the mixed acid solutions. The extraction of Cu2+ can be facilitated by Cl- while it is restrained by SO42- and HSO4-. The extraction reaction of Cu2+ is an exothermic process. The loading capacity of 0.60 mol/L Cextrant 230 for Cu2+ is determined to be 13.1 g/L at an initial pH of 1.16 with 20 g/L Cl-. The loaded Cu(Ⅱ) can be stripped completely by H2SO4. By 2 stages of extraction, the content of iron in the mixed acid solution is decreased from 0.65 g/L to 32 mg/L and only 1.5% copper is co-extracted. After iron removal, the copper product with the purity of 99.7% and the yield of 98.5% can be obtained by 4 stages of extraction, 1 stage of scrubbing and 3 stages of stripping.

Key words: Copper, Cextrant 230, Mixed acid solution, Solvent extraction, Recovery

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