Scholarlink

<p>Red mud, a waste byproduct of aluminum oxide production with a utilization rate below 10%, exhibits potential as a soil substrate for vegetation regeneration. This study employed synergistic treatment of red mud using citric acid (0.1–0.6 mol/L) and calcium nitrate (molar ratio Ca(NO₃)₂:citric acid (Ca/CA) = 3:1–1:3) under reaction temperatures of 25–90&#xa0;°C and durations of 30–240 min, Subsequently, the reaction conditions were optimized. Post-treatment analyses including inductively coupled plasma optical emission spectroscopy (ICP-OES), pH measurement, BCR sequential extraction (a standardized method for heavy metal speciation), laser particle size analysis, and scanning electron microscopy (SEM) revealed significant outcomes: Reduced sodium content, decreased pH, increased particle size, and reduced bioavailability of heavy metals. The treated red mud was mixed with natural soil at ratios of 5:3, 3:1, and 7:1 to form red mud soil. Analysis using the core cutter method, loss-on-ignition method, Electrical conductivity meter (EC meter), ICP, Specific Surface Area Analyzer, and pH measurement demonstrated that the physicochemical properties of red clay soil were significantly improved, including bulk density, porosity, specific surface area, field water-holding capacity, electrical conductivity (EC), exchangeable sodium percentage (ESP), and organic matter content. Planting experiments of red mud soil achieved high germination rates (≥ 84%), with plant height, fresh weight, and dry weight comparable to natural soil. These results confirm the feasibility of modified red mud as plant growth medium, providing theoretical and empirical support for its large-scale utilization.</p> Graphical Abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Properties of Red Mud Treated Synergistically with Citric Acid and Calcium Nitrate and their Effects on Plant Growth after Soil Conversion

  • 期刊论文

  • 发表日期：

    2025年4月1日

查看全文
  • Zhifang Tong,
  • Pujie Hua,
  • Qiang Zeng,
  • Xianjun Li,
  • Shengzhou Zhang,
  • Zihao Hu,
  • Hanyu Jia

摘要

Red mud, a waste byproduct of aluminum oxide production with a utilization rate below 10%, exhibits potential as a soil substrate for vegetation regeneration. This study employed synergistic treatment of red mud using citric acid (0.1–0.6 mol/L) and calcium nitrate (molar ratio Ca(NO₃)₂:citric acid (Ca/CA) = 3:1–1:3) under reaction temperatures of 25–90 °C and durations of 30–240 min, Subsequently, the reaction conditions were optimized. Post-treatment analyses including inductively coupled plasma optical emission spectroscopy (ICP-OES), pH measurement, BCR sequential extraction (a standardized method for heavy metal speciation), laser particle size analysis, and scanning electron microscopy (SEM) revealed significant outcomes: Reduced sodium content, decreased pH, increased particle size, and reduced bioavailability of heavy metals. The treated red mud was mixed with natural soil at ratios of 5:3, 3:1, and 7:1 to form red mud soil. Analysis using the core cutter method, loss-on-ignition method, Electrical conductivity meter (EC meter), ICP, Specific Surface Area Analyzer, and pH measurement demonstrated that the physicochemical properties of red clay soil were significantly improved, including bulk density, porosity, specific surface area, field water-holding capacity, electrical conductivity (EC), exchangeable sodium percentage (ESP), and organic matter content. Planting experiments of red mud soil achieved high germination rates (≥ 84%), with plant height, fresh weight, and dry weight comparable to natural soil. These results confirm the feasibility of modified red mud as plant growth medium, providing theoretical and empirical support for its large-scale utilization.

Graphical Abstract