The bonding/strengthening mechanism of colemanite added organic binders in iron ore pelletization

Date

2012-07-18

Author

SİVRİKAYA, OSMAN
Arol, Ali İhsan

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

209
views

0
downloads

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 compared with the performances of reference bentonite binders. The results of the tests showed that the qualities of pellets are insufficient when organic binders and colemanite are used as binders alone. The former failed to provide sufficient preheated and fired pellet strengths, the latter failed in terms of wet and dry pellet quality. However, good quality wet, dry, preheated and fired pellets could be produced with the combination of these two binders. In addition, stronger pellets could be produced at lower firing temperatures like 1373 K thanks to addition of colemanite. The bonding mechanism of colemanite containing pellets was examined by scanning electron microscopy. It was found that the improved preheated and fired compressive strengths of colemanite-added pellets were due to the physical melting of colemanite at the contact point of magnetite grains during thermal treatment.

Subject Keywords

Colemanite, Boron compounds, Binder, Bentonite, Pelletization

URI

https://hdl.handle.net/11511/42482

Journal

INTERNATIONAL JOURNAL OF MINERAL PROCESSING

DOI

https://doi.org/10.1016/j.minpro.2012.04.010

Collections

Department of Mining Engineering, Article

Suggestions

OpenMETU
Core

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 Effect of Calcined Colemanite Addition on the Mechanical Strength of Magnetite Pellets Produced with Organic Binders SİVRİKAYA, OSMAN; Arol, Ali İhsan; Eisele, Timothy; Kawatra, S. Komar (2013-06-01) 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 test...
Effects of boron compound on characteristics of poly(methyl methacrylate) and its nanocomposites Göktaş, Müberra; Hacaloğlu, Jale; Yılmaz, Ayşen; Department of Polymer Science and Technology (2016) In this work, composites of poly(methyl methacrylate) and benzene-1,4diboronic acid (BDBA) and their nanocomposites with organically modified montmorillonite OMMT prepared by solution and melt mixing, were characterized to study effects of boron content and the preparation method on the properties of PMMA. SEM images showed homogeneous dispersion of BDBA particles for the melt blended, whereas, agglomeration for the solution mixed PMMA/BDBA composites. XRD and TEM results of PMMA nanocomposites indicated th...
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...
Investigation of extraction methodologies for quantitative determination of polycyclic aromatic hydrocarbons in sediments Topal, Tansel; Tuncel, Semra G.; Department of Chemistry (2011) The extraction procedures for the determination of polycyclic aromatic hydrocarbons (PAH) concentrations in sediment samples had been developed by using GC-FID and GC-MS. The optimized methods were soxhlet extraction, ultrasonic bath extraction and solid phase micro extraction (SPME). In order to search out the main factors affecting extraction efficiencies of the methods, factorial design was used. The best extraction method was chosen and optimum values for main factors were selected for the development o...

Citation Formats

O. SİVRİKAYA and A. İ. Arol, “The bonding/strengthening mechanism of colemanite added organic binders in iron ore pelletization,” INTERNATIONAL JOURNAL OF MINERAL PROCESSING, pp. 90–100, 2012, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/42482.