Silica-Based 2-Aminomethylpyridine Functionalized Adsorbent for Hydrometallurgical Extraction of Low-Grade Copper Ore

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• 作者：Xin Li ; Baohua Li ; Shan Wu ; Jingbing Li ; Qitai Xu ; Zhiqiang Yang ; Yuqiang Liu ; Shaohua Wang ; Dongsheng Chen
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2012
• 出版时间：November 21, 2012
• 年：2012
• 卷：51
• 期：46
• 页码：15224-15232
• 全文大小：479K
• 年卷期：v.51,no.46(November 21, 2012)
• ISSN：1520-5045

文摘

A silica-based 2-aminomethylpyridine functionalized adsorbent was synthesized to extract copper. Characterization of the adsorbent was carried out to determine the surface morphology, specific surface area, pore size, and grafting ratio of 2-aminomethylpyridine groups. The adsorption selectivity of the adsorbent for Cu(II) ions was 1353 times higher than that for Fe(III) ions. The adsorption capacity for Cu(II) ions maintained a stable value of 0.53 mmol/g with and without perturbation of Fe(III) ions. Density functional theory (DFT) calculations revealed a mechanism of selective adsorption of copper, through the formation of 2-aminomethylpyridine-Cu(II) complexes. Semi-industrial scale experiments revealed that Cu(II) ions in the acidic leachate of low-grade copper ore could be efficiently extracted by the adsorbent even in perturbation of substantial amounts of Fe(III) and other metal ions. Based on the adsorbent, a new process for copper hydrometallurgical extraction was developed, in which the adverse environmental impacts in traditional solvent extraction processes could be avoided.