About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Characterization of Minerals, Metals and Materials 2022
|
Presentation Title |
Interaction between Iron Ore and Magnesium Additives during Pellet Roasting Process |
Author(s) |
Lianda Zhao, Jingsong Wang, Qingguo Xue, Hong Su |
On-Site Speaker (Planned) |
Lianda Zhao |
Abstract Scope |
To study the interaction between iron ore and magnesium additives, several types of interaction couples were prepared and SEM-EDS was used to measure the diffusion distance of Mg2+. Results showed that prolonging the roasting time was beneficial to the diffusion of Mg2+ in the iron ore. When the basicity (CaO/SiO2) of iron ore increased from 0.2 to 1.0, the diffusion distance of Mg2+ increased from 15μm to 35μm. Among three magnesium additives, the diffusion distance of Mg2+ in dolomite was the longest, while that in serpentine was the shortest. Serpentine contains a large amount of SiO2, which can not participate in the chemical reaction. The presence of SiO2 hindered the contact between MgO and Fe2O3, thus reducing the diffusion distance of Mg2+. The roasting experiment of high magnesium pellets was further carried out to study the influence of basicity on the compressive strength of pellets.
Result shows that the compressive strength of pellets decreased from 2701N to 2556N when 2% dolomite was added. The basicity of high magnesium pellets was adjusted by adding CaO into the pellets. The compressive strength of pellets with basicity of 1.2 was 2629N. The compressive strength of pellets with basicity of 1.5 was 2654N. Adding CaO to high magnesium pellets can improve the compressive strength. |
Proceedings Inclusion? |
Planned: |