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›› 2015, Vol. 15 ›› Issue (2): 230-235.

• 反应与分离 • 上一篇    下一篇

铁矿烧结过程SO2的排放特性及过程脱硫的可行性研究

龙红明 张向阳 李家新 王平 孟庆民 高志芳 春铁军 吴雪健   

  1. 安徽工业大学冶金与资源学院 安徽工业大学冶金与资源学院 江南大学纺织服装学院 安徽工业大学冶金工程学院 安徽工业大学安徽省冶金工程与资源综合利用重点实验室 安徽工业大学安徽省冶金工程与资源综合利用重点实验室 安徽工业大学安徽省冶金工程与资源综合利用重点实验室
  • 收稿日期:2015-05-04 修回日期:1900-01-01 出版日期:2015-05-05 发布日期:2015-05-05
  • 通讯作者: 龙红明

Study on Emission Characteristics of SO2 and Feasibility of Desulfurization in Iron Ore Sintering Process

LONG Hong-ming ZHANG Xiang-yang LI Jia-xin WANG Ping MENG Qing-min GAO Zhi-fang CHUN Tie-jun WU Xue-jian   

  1. School of Metallurgy and Resource, Anhui University of Technology School of Metallurgy and Resource, Anhui University of Technology Key Lab Science and Technology of Eco-Textile, Ministry of Education, Southern Yangtze University School of Metallurgy Engineering, Anhui University of Technology Anhui University of Technology, Anhui Provincial Key Lab of Metallurgy Engineering &Resources Recyclin Anhui University of Technology, Anhui Provincial Key Lab of Metallurgy Engineering &Resources Recyclin Anhui University of Technology, Anhui Provincial Key Lab of Metallurgy Engineering &Resources Recyclin
  • Received:2015-05-04 Revised:1900-01-01 Online:2015-05-05 Published:2015-05-05
  • Contact: LONG Hong-ming

摘要: 通过烧结杯实验,探究铁矿烧结过程中SO2的生成及排放特性,并基于SO2排放特性提出了在过湿层内添加尿素颗粒与烧结过程同步脱硫的新方法. 结果表明,铁矿烧结过程前期生成的SO2被料层内水分吸收并积聚在过湿层内,烟气中的SO2浓度稳定在较低水平;当过湿层被高温烟气干燥完成并开始消失时,被水分吸收的SO2会大量、迅速地释放,与尿素脱硫剂快速反应生成硫酸铵超细颗粒,并通过除尘捕获,既不进入烧结矿,也不随烟气排向大气. 工业试验表明,该方法可将SO2排放浓度从基准期时694.2 mg/m3降低至108.0 mg/m3,脱硫率为84.4%. 另外,该工艺与现有脱硫工艺相比,具有投资成本低、脱硫过程简单等优点.

关键词: 铁矿, 烧结, 二氧化硫, 脱硫, 尿素, 过湿层

Abstract: The formation and emission characteristics of SO2 during iron ore sintering process were studied by sintering pot experiments. A new synchronous desulfurization technology was put forward by adding urea in wetting layer during sintering. The results showed that the concentration of SO2 in the pre-stage of sintering process was steadily maintained at a low level because SO2 generated in the pre-stage was absorbed by water within the material layer and accumulated in excessive moisture layer. When the wetting layer was dried by heating of high temperature exhaust gas, the SO2 absorbed by water released largely, rapidly reacted to form ammonium sulfate powder, and captured by dust, neither entering sintered ore nor discharge to the atmosphere with exhaust gas. The sintering pot simulation and industrial test showed that the desulfurization method resulted in significant emission reduction. Compared with the standard test, the emission concentration of SO2 declined from 694.2 to 108.0 mg/m3 in experiments, and the quality of sinter product was not affected. Moreover, compared with the traditional technologies, the new method provided a new low-cost, high-efficiency desulphurization technology for treatment of SO2 emission.

Key words: iron ore, sintering, sulfur dioxide, desulfurization, urea, wetting layer

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