Dilatometric Characterization of Direct Reduction Pellets
Journal Title: International Journal of engineering Research and Applications - Year 2017, Vol 7, Issue 10
Abstract
During the reduction process, the increase in volume of the iron ore pellets leads to a decrease in the mechanical resistance or disintegration of the pellets which lead to the unfeasibility of the process. The present work has the objective of evaluating the thermal expansion behavior of the direct reduction pellets using dilatometry. For this, the dilatometric expansion curve and the coefficient of thermal expansion of the pellets were determined through a horizontal pushrod dilatometer under an argon atmosphere. The dilatometric results showed that the expansion of the pellet increased and the degree of expansion decreased as the temperature increased, and changes in the expansion curve demonstrated the occurrence of microstructural transformations due to the presence of MgO and SiO2 in the composition of the pellet. The pellets were submitted to thermal cycles with a gradual increase of temperature up to 600°C, 900°C, 1000°C and 1050°C, which presented similar results of coefficient of expansion and made it possible to relate the dilatometric results with the compressive strength of the pellets, which intensified with material expansion to the temperature of 1000°C and showed significant loss of strength when exhibited shrinkage in the temperature range of 1000-1050°C
Authors and Affiliations
Evandro Virgolino Gonçalves, Daiane Cardial, Gláucio Soares da Fonseca, José Adilson de Castro
Keywords
Related Articles
- EP ID EP392506
- DOI 10.9790/9622-0710014853.
- Views 94
- Downloads 0
Efficient learning based Image Super Resolution via Sparse Representation
This paper addresses the problem of generating a superresolution (SR) image from a single low-resolution input image. Research on image statistics suggests that image patches can be well represented as a sparse linear co...
Key Issues And Challenges with Web Crawlers
Due to the current size of the Web and its dynamic nature, building an efficient search mechanism is very important. A vast number of web pages are continually being added every day, and information is constantly changin...
Review Study of soil behavior mix with Reinforcement Fiber
Soil reinforcement has more and more become a viable choice for raising the performance of earth structure underneath unstable and dynamic loading. Within the past few decades, haphazardly distributed fiberreinforced soi...
A Dynamic Model Of Synchronous Machine
Synchronous electrical machines usually have three phase variable current winding in stator, direct current excitation winding in rotor and short closed loop distributed damping winding in rotor. The power of synchronous...
Hedge Algebras Tuning of PID Controller
In this paper, the author proposes a method modified on-line the parameters of the PID controller based on combining the hedge algebras control and model reference system. This proposal has inherited the adaption of hedg...