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<p>The separation of quartz and feldspar remains a significant challenge due to the environmental hazards of fluoride-based methods. This work investigated the effects of four organic acids on the flotation separation of quartz from feldspar using dodecylamine (DDA) as a collector under fluoride-free alkaline conditions. Single mineral flotation experiments revealed that under optimized conditions (pH 11, 30℃, 1 × 10<sup>–3</sup>&#xa0;mol/L sodium oxalate (SO), 6 × 10<sup>–5</sup>&#xa0;mol/L DDA, size of 180 ~ 105 μm), a 95.56% quartz-feldspar recovery difference was achieved. Artificial mixed mineral at a feldspar/quartz mass ratio of 20% flotation results obtained a yield of 86.14%, SiO<sub>2</sub> grade of 96.01%, SiO<sub>2</sub> recovery of 88.80%, and selectivity index (<i>SI</i>) of 1.89. Adsorption capacity, zeta potential, Fourier transform infrared spectroscopy (FTIR), contact angle, surface energy, and X-ray photoelectron spectroscopy (XPS) analyses showed that SO selectively adsorbs onto the feldspar surface through chelation with exposed Al sites, forming stable complexes. This process enhances surface polarity while blocking active sites, thereby disrupting feldspar hydrophobicity by inhibiting DDA adsorption, while quartz maintains hydrophobicity with minimal effect. This work pioneered the use of low-cost, non-toxic organic acids as selective inhibitors, offering a sustainable alternative to fluoride reagents for high-purity quartz sand industries.</p>

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Sodium Oxalate as an Eco-Friendly Inhibitor in Flotation Separation of Quartz and Feldspar

  • 期刊论文

  • 发表日期：

    2025年11月6日

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  • Xuyang Fan,
  • Hanjun Wu,
  • Tingting Xiao,
  • Haoran Wang,
  • Zhiquan Pan,
  • Han Zhang,
  • Hong Zhou

摘要

The separation of quartz and feldspar remains a significant challenge due to the environmental hazards of fluoride-based methods. This work investigated the effects of four organic acids on the flotation separation of quartz from feldspar using dodecylamine (DDA) as a collector under fluoride-free alkaline conditions. Single mineral flotation experiments revealed that under optimized conditions (pH 11, 30℃, 1 × 10–3 mol/L sodium oxalate (SO), 6 × 10–5 mol/L DDA, size of 180 ~ 105 μm), a 95.56% quartz-feldspar recovery difference was achieved. Artificial mixed mineral at a feldspar/quartz mass ratio of 20% flotation results obtained a yield of 86.14%, SiO2 grade of 96.01%, SiO2 recovery of 88.80%, and selectivity index (SI) of 1.89. Adsorption capacity, zeta potential, Fourier transform infrared spectroscopy (FTIR), contact angle, surface energy, and X-ray photoelectron spectroscopy (XPS) analyses showed that SO selectively adsorbs onto the feldspar surface through chelation with exposed Al sites, forming stable complexes. This process enhances surface polarity while blocking active sites, thereby disrupting feldspar hydrophobicity by inhibiting DDA adsorption, while quartz maintains hydrophobicity with minimal effect. This work pioneered the use of low-cost, non-toxic organic acids as selective inhibitors, offering a sustainable alternative to fluoride reagents for high-purity quartz sand industries.