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<p>Low-grade copper oxide ore containing high silicon, composed of mainly of chrysocolla, quartz, muscovite, dolomite, kaolinite, and Na-feldspar, is a promising source for recovery, which processing by existing methods are not economical. An alkali-dissolving desilication method, followed by ammonia leaching for extraction of copper from low-grade copper oxide ore was explored in this research. The samples were characterized by using chemical analysis, X-ray diffraction, and SEM-EDS. While the Eh-pH diagrams were applied to be predicted the desilication mechanism for chrysocolla, quartz, muscovite, kaolinite, and Na-feldspar. The porous structure of desiliconized ore enhanced ammonia leaching of copper from copper oxide ore. The results show that the Si removal rate was 73.34&#xa0;pct from copper oxide ore at the optimal desilication conditions: NaOH/copper oxide ore mass ratio 6/10, desiliconizing temperature 200&#xa0;°C and desiliconization time 2&#xa0;hour and that the Cu extraction from copper oxide ore desiliconized was 96.60&#xa0;pct at the optimal ammonia leaching conditions of ammonia concentration 1.20&#xa0;mol/L, ammonia-ammonium carbonate 0.9&#xa0;mol/L, liquid-solid ratio 3:1&#xa0;mL/g, and leaching time 1.5&#xa0;hour. Consequently, the technology of processing of low-grade raw materials is proposed, that allows to increase the comprehensiveness of raw materials usage.</p>

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Efficient Extraction of Cu from Copper Oxide Ores with High Silicon by Alkali-Dissolving Desilication Coupling with Ammonia Leaching

  • 期刊论文

  • 发表日期：

    2025年1月24日

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  • Yiting Hu,
  • Zhixiong Liu,
  • Yuhang Tian,
  • Fei Li,
  • Qiuling Zou

摘要

Low-grade copper oxide ore containing high silicon, composed of mainly of chrysocolla, quartz, muscovite, dolomite, kaolinite, and Na-feldspar, is a promising source for recovery, which processing by existing methods are not economical. An alkali-dissolving desilication method, followed by ammonia leaching for extraction of copper from low-grade copper oxide ore was explored in this research. The samples were characterized by using chemical analysis, X-ray diffraction, and SEM-EDS. While the Eh-pH diagrams were applied to be predicted the desilication mechanism for chrysocolla, quartz, muscovite, kaolinite, and Na-feldspar. The porous structure of desiliconized ore enhanced ammonia leaching of copper from copper oxide ore. The results show that the Si removal rate was 73.34 pct from copper oxide ore at the optimal desilication conditions: NaOH/copper oxide ore mass ratio 6/10, desiliconizing temperature 200 °C and desiliconization time 2 hour and that the Cu extraction from copper oxide ore desiliconized was 96.60 pct at the optimal ammonia leaching conditions of ammonia concentration 1.20 mol/L, ammonia-ammonium carbonate 0.9 mol/L, liquid-solid ratio 3:1 mL/g, and leaching time 1.5 hour. Consequently, the technology of processing of low-grade raw materials is proposed, that allows to increase the comprehensiveness of raw materials usage.