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The Effect of Calcined Colemanite Addition on the Mechanical Strength of Magnetite Pellets Produced with Organic Binders
Date
2013-06-01
Author
SİVRİKAYA, OSMAN
Arol, Ali İhsan
Eisele, Timothy
Kawatra, S. Komar
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Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
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Iron ore pellets must have sufficient mechanical strengths against degradation in all stages of pellet production. Low strength is also a problem for product pellets since they abrade during transportation to the reduction furnaces. The use of a binder is necessary to provide sufficient strength to the pellets and for better operation and handling of pellets. Bentonite is the standard binder in the industry; however, it is considered an impurity due to its acid oxide contents. Organic binders have been tested for many years as alternative binder to bentonite. They have been found to give sufficient wet pellet properties. However, they failed to provide sufficient strength to the preheated and fired pellets due to lack of slag bonding. It has been assumed that one possible effective method to improve the preheated and fired pellet strengths is addition of a slag-bonding constituent. In this study, calcined colemanite was added to the pellet feed to overcome the lower strength problem encountered with organic binder use. The strength of pellets produced with organic binders and calcined colemanite alone and in combination was comparatively studied against the strength of pellets made with standard bentonite binder in magnetite concentrate pelletizing. The results showed that addition of calcined colemanite into the pellet mixture improved the preheated and fired pellet strengths of pellets produced with organic binders.
Subject Keywords
Pelletizing
,
Organic binder
,
Iron ore
,
Colemanite
,
Boron compounds
,
Bentonite
,
Binder
URI
https://hdl.handle.net/11511/41011
Journal
MINERAL PROCESSING AND EXTRACTIVE METALLURGY REVIEW
DOI
https://doi.org/10.1080/08827508.2012.657021
Collections
Department of Mining Engineering, Article
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Iron ore pellets should have sufficient mechanical strengths against degradation at all stages of pellet production in pelletizing plants. Besides the strength, pellets should have less dust emission during operation since the process efficiency and the pelletizing equipments are adversely affected by dust. Dust is also a problem for sintered (product) pellets since they abrade during transportation from pellet production site to the reduction facilities. Sufficient mechanical strength and low dust emission...
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The addition of boron compounds into pellet mix is proposed as a potential solution to overcome the insufficient compressive strengths of preheated and fired pellets produced with organic binders. Colemanite was tested as an alternative binder to bentonite either alone or in combination with some organic binders on magnetite pellets. The performances of the tested binders on pellet qualities: balling, wet pellet moisture content, drop number, compressive strengths and microstructure of pellets have been com...
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ALTERNATIVE BINDERS TO BENTONITE FOR IRON ORE PELLETIZING: PART I: EFFECTS ON PHYSICAL AND MECHANICAL PROPERTIES
Sivrikaya, Osman; Arol, A. I. (Instituto Federal de Educacao, Ciencia e Tecnologia do Rio Grande do Norte (IFRN), 2014-7-3)
<jats:p>The use of conventional bentonite binder is favorable in terms of mechanical and metallurgical pellet properties, however, because of its acid constituents bentonite is considered as impurity especially for iron ores with high acidic content. Therefore, alternative binders to bentonite have been tested. Organic binders are the most studied binders and they yield pellets with good wet strength; they fail in terms of preheated and fired pellet strengths. This study was conducted to investigate how ins...
ALTERNATIVE BINDERS TO BENTONITE FOR IRON ORE PELLETIZING : PART II : EFFECTS ON METALLURGICAL AND CHEMICAL PROPERTIES
Sivrikaya, Osman; Arol, A. I. (Instituto Federal de Educacao, Ciencia e Tecnologia do Rio Grande do Norte (IFRN), 2014-7-3)
<jats:p>This study was started to find alternative binders to bentonite and to recover the low preheated and fired pellet mechanical strengths of organic binders-bonded pellets. Bentonite is considered as a chemical impurity for pellet chemistry due to acid constituents (SiO2 and Al2O3). Especially addition of silica-alumina bearing binders is detrimental for iron ore concentrate with high acidic content. Organic binders are the most studied binders since they are free in silica. Although they yield pellets...
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O. SİVRİKAYA, A. İ. Arol, T. Eisele, and S. K. Kawatra, “The Effect of Calcined Colemanite Addition on the Mechanical Strength of Magnetite Pellets Produced with Organic Binders,”
MINERAL PROCESSING AND EXTRACTIVE METALLURGY REVIEW
, pp. 210–222, 2013, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/41011.