Method to improve preheated and fired strengths of haematite pellets using boron compounds with organic binders

Date

2013-01-01

Author

SİVRİKAYA, OSMAN
Arol, Ali İhsan

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Organic binders as alternatives to bentonite in iron ore pelletisation have found limited application since they fail to give enough mechanical strength to preheated and fired pellets. This paper describes the use of alternative binders to bentonite for haematite ore pelletisation. Organic binders (carboxyl methyl cellulose, corn starch, dextrin) and agglomeration aid chemicals (polymer and flocculants) and boron compounds (colemanite and borax pentahydrate) were tested as binder alone or in combination. The influence of the boron compound added organic binders on the preheated and fired pellet strengths was determined. The results showed that the compressive strengths of preheated pellets at 1000 degrees C made with organic binders can be improved with the addition of colemanite. The compressive strengths of fired pellets at 1300 degrees C produced with organic binders plus colemanite were found to be significantly greater than those of pellets bonded with the reference bentonite binder.

Subject Keywords

Haematite, Pelletising, Bentonite, Organic binder, Colemanite, Borax pentahydrate

URI

https://hdl.handle.net/11511/48377

Journal

IRONMAKING & STEELMAKING

DOI

https://doi.org/10.1179/1743281212y.0000000016

Collections

Department of Mining Engineering, Article

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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...
The bonding/strengthening mechanism of colemanite added organic binders in iron ore pelletization SİVRİKAYA, OSMAN; Arol, Ali İhsan (2012-07-18) 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...
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...
Use of boron compounds as binders in iron ore pelletization Sivrikaya, Osman; Arol, Ali İhsan (2010-05-01) Low grade iron ores with impurity gangue minerals containing silica and alumina must be upgraded to an acceptable level of iron content. Concentrates, due to their fine sizes, are not suitable to be directly charged to the iron-making processes such as the blast furnace or the DR-plant. Hence, an agglomeration technique should be applied to fine concentrate. The most commonly employed one is pelletizing in iron ore industry. In pelletizing, iron ore, water and a binder are balled in a mechanical disc or dru...
Pelletization of magnetite ore with colemanite added organic binders Sivrikaya, O.; Arol, Ali İhsan (2011-06-10) A new generation binder consisting of an organic binder and a borate salt was tested as an alternative to bentonite in magnetite ore pelletization. Carboxyl methyl cellulose (CMC),Ciba DPEP06-0007 and corn starch, and calcined colemanite were used as organic binders and the borate salt, respectively. They were added to the pellet feed separately and in different combinations at several addition levels. It was found that the use of organic binders is sufficient in terms of wet pellet quality; however, they f...

Citation Formats

O. SİVRİKAYA and A. İ. Arol, “Method to improve preheated and fired strengths of haematite pellets using boron compounds with organic binders,” IRONMAKING & STEELMAKING, pp. 1–8, 2013, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/48377.