Scholarlink

<p>The quality of iron ore pellets is influenced by iron ore gangue content, flux composition, firing temperature, and time. High alumina levels in iron ore fines adversely affect pellet quality, including cold compressive strength (CCS), reduction degradation index (RDI), tumbler index (TI), and abrasion index (AI). This study investigates the influence of varying iron ore alumina concentrations (2.3, 3.2, and 4.0 pct) on pellet quality. Green pellets were indurated at 1280&#xa0;°C. Fired pellet properties such as strength, porosity, RDI, and Hoogoven Simulation (HOSIM), a blast furnace reduction behavior simulation test, were studied. To understand the phase and microstructural changes, fired pellets were characterized using XRD, phase quantification, SEM-EDS, and elemental mapping. Results show that pellet strength decreased from 260 to 174 kg/pellet as alumina increased from 2.3 to 4.0 pct. The variation in pellet strength after reduction was also analyzed to assess the pellets’ stability in the blast furnace. FactSage studies were conducted to understand and quantify the evolution of the slag phase. A decrease in melt formation and fewer solid-state crystalline bonds results in lower pellet strength. To improve the quality of high alumina iron ore pellets, MnO<sub>2</sub> is added at dosages ranging from 0.5 to 2 pct in increments of 0.5 pct. Detailed MnO<sub>2</sub> ore characterization was conducted using chemical analysis, density, XRD, TGA-DSC, and SEM-EDS to understand the thermal stability and interactions with the pellet matrix. The MnO<sub>2</sub> addition not only increases the strength of high alumina iron ore pellets by 29.88 pct (from 174 to 226&#xa0;kg/pellet), but it also reduces the reducibility time by 13 pct (from 158 to 137&#xa0;minutes) due to the structural integrity of fired pellets.</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

Influence of MnO2 on Quality of High Alumina Iron Ore Pellets

  • 期刊论文

  • 发表日期：

    2026年7月2日

查看全文
  • Shaik Mahaboob Basha,
  • Munukutla Sri Sai Ramesh,
  • Srinivas Dwarapudi,
  • Siddhartha Misra,
  • Ashok Kamaraj

摘要

The quality of iron ore pellets is influenced by iron ore gangue content, flux composition, firing temperature, and time. High alumina levels in iron ore fines adversely affect pellet quality, including cold compressive strength (CCS), reduction degradation index (RDI), tumbler index (TI), and abrasion index (AI). This study investigates the influence of varying iron ore alumina concentrations (2.3, 3.2, and 4.0 pct) on pellet quality. Green pellets were indurated at 1280 °C. Fired pellet properties such as strength, porosity, RDI, and Hoogoven Simulation (HOSIM), a blast furnace reduction behavior simulation test, were studied. To understand the phase and microstructural changes, fired pellets were characterized using XRD, phase quantification, SEM-EDS, and elemental mapping. Results show that pellet strength decreased from 260 to 174 kg/pellet as alumina increased from 2.3 to 4.0 pct. The variation in pellet strength after reduction was also analyzed to assess the pellets’ stability in the blast furnace. FactSage studies were conducted to understand and quantify the evolution of the slag phase. A decrease in melt formation and fewer solid-state crystalline bonds results in lower pellet strength. To improve the quality of high alumina iron ore pellets, MnO2 is added at dosages ranging from 0.5 to 2 pct in increments of 0.5 pct. Detailed MnO2 ore characterization was conducted using chemical analysis, density, XRD, TGA-DSC, and SEM-EDS to understand the thermal stability and interactions with the pellet matrix. The MnO2 addition not only increases the strength of high alumina iron ore pellets by 29.88 pct (from 174 to 226 kg/pellet), but it also reduces the reducibility time by 13 pct (from 158 to 137 minutes) due to the structural integrity of fired pellets.

Graphical abstract