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<p>The resource utilization of raffinate acid is hindered by its high impurity content and viscosity. This study evaluates a low-cost purification process using guar gum modified adsorbents. Screening of 9 materials identified guar gum modified 001 × 7 resin as the most effective for removing Fe, Mg, and Al ions. Furthermore, in three-step static adsorption experiments, integrating an SiC membrane pretreatment step proved critical, reducing the adsorbent consumption from 50% to 10% while maintaining high removal efficiencies of 87% for Fe, 89.5% for Mg, and 89.6% for Al. The adsorption kinetics for the guar-gum-modified resin followed a pseudo-second-order model. This integrated membrane-adsorption process presents a viable and efficient solution for raffinate acid purification, advancing sustainable practices in the phosphorus industry.</p> Graphical Abstract <p></p>

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Purification of Raffinate Acid with Concentrated Fe-,Mg-,Al-oxides by using Three-Step Static Adsorption Methods Based on Adsorbents Modified by Guar Gum

  • 期刊论文

  • 发表日期：

    2026年2月2日

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  • Xin Wang,
  • Guanghai Xue,
  • Cheng Li,
  • Yongguang Wang,
  • Guangfeng Tai,
  • Meng Wu,
  • Shewei Pan

摘要

The resource utilization of raffinate acid is hindered by its high impurity content and viscosity. This study evaluates a low-cost purification process using guar gum modified adsorbents. Screening of 9 materials identified guar gum modified 001 × 7 resin as the most effective for removing Fe, Mg, and Al ions. Furthermore, in three-step static adsorption experiments, integrating an SiC membrane pretreatment step proved critical, reducing the adsorbent consumption from 50% to 10% while maintaining high removal efficiencies of 87% for Fe, 89.5% for Mg, and 89.6% for Al. The adsorption kinetics for the guar-gum-modified resin followed a pseudo-second-order model. This integrated membrane-adsorption process presents a viable and efficient solution for raffinate acid purification, advancing sustainable practices in the phosphorus industry.

Graphical Abstract