Pelletizing is a size enlargement technique employed to process fine-grained
iron-bearing concentrates and powder ores. Mechanical strength of fired pellets
is important for handling. When the pellets undergo metallurgical processing,
their mechanical strength is a measure of their resistance to degradation by
breakage due to impacts and abrasion to which they are exposed in the upper
part of the blast furnace.
In this study, heat treatment of iron ore agglomerates with microwave energy is
investigated. First drying and then heat hardening tests were performed. Two
main properties of pellets were taken into consideration: percent moisture and
magnetite content for the dried pellets and compressive strength and also
magnetite content for the fired pellets. The tests were conducted with different
particle sized pellets, in different durations. In order to increase the oxidation
rate in heat hardening tests, Na2O2 is also added in different percentages.
The results of the study showed that, magnetite pellets can indeed be dried and
heated with microwave energy. However, the attained compressive strength and
v
the oxidation of the fired pellets were not sufficient as compared to pellets
produced by conventional heating
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12605859/index.pdf |
| Date | 01 February 2005 |
| Creators | Cirpar, Cigdem |
| Contributors | Arol, Ali Ihsan |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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