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<p>Steel metallurgical processes generate substantial quantities of iron-bearing dust and sludge. As is typical of dust removal by-products, iron-bearing sludge (OG sludge) and iron-bearing dust (LT dust) exhibit high iron content and are rich in valuable elements such as Ca and Mg, presenting significant resource recovery potential. The present study employed a cold-press pelletizing method for the synergistic treatment of OG sludge and LT dust, investigating the process parameters for pellet preparation. Experiments were conducted to determine the optimal molding moisture, which was found to be 7.5%. The optimal molding pressure was determined to be 4.23&#xa0;MPa, while the pressure holding time was set to three minutes. The curing time was established at 72 hours, and the optimal OG sludge to LT dust ratio was determined to be 5:5. The optimal composite binder composition was determined to be 80% bentonite, 15% sodium silicate, and 5% starch, with a binder addition rate of 5%. The experimental findings demonstrate that pellets formulated according to this particular methodology attained a compressive strength of 37.62&#xa0;MPa and a drop strength of 13.5 counts. This outcome signifies a substantial enhancement in comparison to other pellets that have been subjected to comparable testing conditions. These findings provide a viable solution for the resource recovery of iron-bearing solid waste in the steel industry, holding considerable significance for advancing energy conservation, emission reduction, and sustainable development within the sector.</p>

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Preparation Process for Cold-Pressed Pellets of Iron-Bearing Sludge and Dust from Steel Production Process

  • 期刊论文

  • 发表日期：

    2026年3月10日

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  • Guoqiang Gao,
  • Shuning Sun,
  • Shihua Tang,
  • Shutang Zhang,
  • Shuhua Geng,
  • Yuwen Zhang,
  • Xionggang Lu

摘要

Steel metallurgical processes generate substantial quantities of iron-bearing dust and sludge. As is typical of dust removal by-products, iron-bearing sludge (OG sludge) and iron-bearing dust (LT dust) exhibit high iron content and are rich in valuable elements such as Ca and Mg, presenting significant resource recovery potential. The present study employed a cold-press pelletizing method for the synergistic treatment of OG sludge and LT dust, investigating the process parameters for pellet preparation. Experiments were conducted to determine the optimal molding moisture, which was found to be 7.5%. The optimal molding pressure was determined to be 4.23 MPa, while the pressure holding time was set to three minutes. The curing time was established at 72 hours, and the optimal OG sludge to LT dust ratio was determined to be 5:5. The optimal composite binder composition was determined to be 80% bentonite, 15% sodium silicate, and 5% starch, with a binder addition rate of 5%. The experimental findings demonstrate that pellets formulated according to this particular methodology attained a compressive strength of 37.62 MPa and a drop strength of 13.5 counts. This outcome signifies a substantial enhancement in comparison to other pellets that have been subjected to comparable testing conditions. These findings provide a viable solution for the resource recovery of iron-bearing solid waste in the steel industry, holding considerable significance for advancing energy conservation, emission reduction, and sustainable development within the sector.