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<p>The elimination of sulfur oxides (SO<sub>2</sub>) and nitrogen oxides (NO<sub><i>x</i></sub>) from the sintering flue gas is a key chanllenge in pollutant treatment for the iron and steel industry. Using digested quicklime (Ca(OH)₂) as an adsorbent, this study systematically investigated the effects of temperature, relative humidity, SO<sub>2</sub> concentration, NO<sub>2</sub> concentration, CO<sub>2</sub> concentration, and O<sub>2</sub> concentration on the SO<sub>2</sub> and NO<sub>x</sub> removal process under ultra-low emission conditions. The growth mechanisms of sulfate and nitrate, along with the phase evolution mechanism, were elucidated. Sulfate formed as a superficial layer on the adsorbent surface, gradually connecting to form a dense barrier. This led to a sharp decrease in BET surface area, pore volume, and pore size, ultimately causing adsorbent exhaustion. In contrast, the products of NO₂ removal exhibited an inward growth model, forming small holes and cracks on the adsorbent surface. The mechanism underlying the significant simultaneous increase in quicklime consumption and CaCO₃ formation in the products during the transition from low-emission to ultra-low emission standards for SO₂ and NOₓ reduction was clarified.</p>

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The simultaneous removal of SO2 and NOx from sintering flue gas with hydrated lime under low-temperature

  • 期刊论文

  • 发表日期：

    2025年10月1日

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  • Shuhua Geng,
  • Guoqiang Gao,
  • Tiehua Cao,
  • Guangshi Li,
  • Yuwen Zhang,
  • Xingli Zou,
  • Xionggang Lu

摘要

The elimination of sulfur oxides (SO2) and nitrogen oxides (NOx) from the sintering flue gas is a key chanllenge in pollutant treatment for the iron and steel industry. Using digested quicklime (Ca(OH)₂) as an adsorbent, this study systematically investigated the effects of temperature, relative humidity, SO2 concentration, NO2 concentration, CO2 concentration, and O2 concentration on the SO2 and NOx removal process under ultra-low emission conditions. The growth mechanisms of sulfate and nitrate, along with the phase evolution mechanism, were elucidated. Sulfate formed as a superficial layer on the adsorbent surface, gradually connecting to form a dense barrier. This led to a sharp decrease in BET surface area, pore volume, and pore size, ultimately causing adsorbent exhaustion. In contrast, the products of NO₂ removal exhibited an inward growth model, forming small holes and cracks on the adsorbent surface. The mechanism underlying the significant simultaneous increase in quicklime consumption and CaCO₃ formation in the products during the transition from low-emission to ultra-low emission standards for SO₂ and NOₓ reduction was clarified.