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<p>Columbite ore (FeNb<sub>2</sub>O<sub>6</sub>) is a critical niobium resource, yet conventional extraction via hydrofluoric acid digestion poses severe environmental challenges. This study proposes an eco-friendly process based on soda-ash-assisted reduction roasting that achieves simultaneous Fe/Nb separation and the preparation of a high-purity sodium niobate (NaNbO<sub>3</sub>). During the reductive roasting process, the presence of sodium carbonate facilitates the formation of sodium niobate and metallic iron. Following roasting at a temperature of 1100°C for 30&#xa0;min, the metallization ratio of iron exceeds 95%. Concurrently, titanium and manganese species undergo transformation into sodium titanate and MnO, respectively, both of which demonstrate high solubility in acid. Subsequently, metallic iron and non-magnetic material (enriched in NaNbO<sub>3</sub>) were separated through magnetic separation. Furthermore, high-purity NaNbO<sub>3</sub> is obtained via the washing of the non-magnetic material with sulfuric acid. The proposed process eliminates HF, achieving dual recovery of commercial-grade Fe (94.63%) and Nb products (99.6% NaNbO<sub>3</sub>), showcasing environmental and economic advantages over conventional methods.</p>

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Eco-Friendly Separation of Fe/Nb and High-Purity Sodium Niobate Preparation via Soda-Ash-Assisted Reductive Roasting of Columbite Ore

  • 期刊论文

  • 发表日期：

    2025年10月28日

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  • Zhong Ai,
  • Guanghui Li,
  • Tao Jiang,
  • Zhao Yang,
  • Guoying Yan,
  • Dan Wu,
  • Zhongshuai Jia,
  • Mingjun Rao

摘要

Columbite ore (FeNb2O6) is a critical niobium resource, yet conventional extraction via hydrofluoric acid digestion poses severe environmental challenges. This study proposes an eco-friendly process based on soda-ash-assisted reduction roasting that achieves simultaneous Fe/Nb separation and the preparation of a high-purity sodium niobate (NaNbO3). During the reductive roasting process, the presence of sodium carbonate facilitates the formation of sodium niobate and metallic iron. Following roasting at a temperature of 1100°C for 30 min, the metallization ratio of iron exceeds 95%. Concurrently, titanium and manganese species undergo transformation into sodium titanate and MnO, respectively, both of which demonstrate high solubility in acid. Subsequently, metallic iron and non-magnetic material (enriched in NaNbO3) were separated through magnetic separation. Furthermore, high-purity NaNbO3 is obtained via the washing of the non-magnetic material with sulfuric acid. The proposed process eliminates HF, achieving dual recovery of commercial-grade Fe (94.63%) and Nb products (99.6% NaNbO3), showcasing environmental and economic advantages over conventional methods.