Heat treatment of iron ore agglomerates with microwave energy

Download

index.pdf

Date

2005

Author

Çırpar, Çiğdem

Metadata

Show full item record

Item Usage Stats

256
views

155
downloads

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.

Subject Keywords

General Biology.

URI

http://etd.lib.metu.edu.tr/upload/12605859/index.pdf
https://hdl.handle.net/11511/14826

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Hemicellulose based biodegradable film production Göksu, Emel Iraz; Bakır, Ufuk; Department of Chemical Engineering (2005) Xylan was extracted from cotton waste, characterized by DSC and TGA analysis and used in biodegradable film production. Pure cotton waste xylan did not form film. The presence of an unknown compound, as an impurity, yielded composite films. The unknown compound was determined as a phenolic compound, and most probably lignin, by using DSC and TGA analysis and Folin-Ciocalteau method. The effects of xylan concentration of the film forming solutions, glycerol (plasticizer) and gluten additions on thickness, me...
Antimicrobial spectrum determination of the K5 type yeast killer protein on bacteria causing skin infections and its cell killing activity Gönen, Tuğçe; İzgü, Kadri Fatih; Department of Biology (2006) Some yeast strains secrete extracellular polypeptide toxins known to have potential growth inhibitory activity on sensitive yeast cells. These yeast strains are known as killer yeasts and their toxins are named as killer toxins or killer proteins. Yeast killer proteins are found inhibitory to Gram-positive bacteria in several studies which were based on microbial interactions of the producer strains tested with sensitive strains. K5 type yeast killer protein produced by Pichia anomala NCYC 434 was previousl...
Tribological properties of a tightly woven carbon-carbon composite Karaveli, Keriman; Öztürk, Abdullah; Department of Metallurgical and Materials Engineering (2005) Tribological properties of a tightly woven Carbon/Carbon (C/C) composite were assessed experimentally in accord with the ASTM pin on disk technique. The C/C composite used in this study was a commercial material (K-Karb) obtained in a panel form. The composite consists of graphite fiber reinforced graphite matrix developed for aerospace applications. The fiber reinforcement was in a plain weave woven fabric form. The tests were conducted by sliding zirconia ball against the C/C composite. The friction coeff...
Tip enhanced Raman scattering with adiabatic plasmon focusing tips. Bek, Alpan; DAS, G; Di, Fabrizio; LAZZARINO, M (Elsevier BV, 2011-06-01) Tip-Enhanced Raman spectroscopy (TERS) is a promising microscopy technique which combines, in principle, outstanding spatial resolution with a detailed chemical analysis of the sample. However, as yet, it is not routinely used although an increasing number of research groups are becoming more actively involved in the field. Among the several reasons which can explain the relatively low usage of TERS, the lack of reproducibility of tips as field enhancers is probably the most critical. Here we propose and de...
Optimisation of agrobacterium mediated gene transfer and micrografting systems in lentil (lens culinaris medik) Kamçı, Hamdi; Öktem, Hüseyin Avni; Department of Biotechnology (2004) In this work Agrobacterium (KYRT1::pTJK136) mediated gene transfer to lentil (Lens culinaris Medik.) embriyo apex and regeneration through micro-grafting in lentil was studied. In micro-grafting two different types root stock stem height and root stock preparations were optimized. According to the results half stem length was found to be more successful then the full. Also lentil root stock was more successful then the chickpea root stock. The types of root stock preparations studied were designated as Z an...

Citation Formats

Ç. Çırpar, “Heat treatment of iron ore agglomerates with microwave energy,” M.S. - Master of Science, Middle East Technical University, 2005.