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ALTERNATIVE BINDERS TO BENTONITE FOR IRON ORE PELLETIZING : PART II : EFFECTS ON METALLURGICAL AND CHEMICAL PROPERTIES
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Date
2014-7-3
Author
Sivrikaya, Osman
Arol, A. I.
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<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 with good wet strength; they have found limited application in industry since they fail to give sufficient physical and mechanical strength to preheated and fired pellets. It is investigated that how insufficient preheated and fired pellet strengths can be improved when organic binders are used as binder. The addition of a slag bonding/strength increasing constituent (free in acidic contents) into pellet feed to provide pellet strength with the use of organic binders was proposed. Addition of boron compounds such as colemanite, tincal, borax pentahydrate, boric acid together with organic binders such as CMC, starch, dextrin and some organic based binders, into magnetite and hematite pellet mixture was tested. After determining the addition of boron compounds is beneficial to recover the low pellet physical and mechanical qualities in the first part of this study, in this second part, metallurgical and chemical properties (reducibility - swelling index – microstructure – mineralogy - chemical content) of pellets produced with combined binders (an organic binder plus a boron compound) were presented. The metallurgical and chemical tests results showed that good quality product pellets can be produced with combined binders when compared with the bentonite-bonded pellets. Hence, the suggested combined binders can be used as binder in place of bentonite in iron ore pelletizing without compromising the pellet chemistry.</jats:p>
Subject Keywords
Iron ore pelletizing
,
Bentonite & organic binder
,
Boron compounds
,
Colemanite
,
Chemical and metallurgical properties
URI
https://hdl.handle.net/11511/51472
Journal
HOLOS
DOI
https://doi.org/10.15628/holos.2014.1759
Collections
Department of Mining Engineering, Article
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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...
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...
Method to improve preheated and fired strengths of haematite pellets using boron compounds with organic binders
SİVRİKAYA, OSMAN; Arol, Ali İhsan (2013-01-01)
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. Th...
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...
The flame retardant effect of aluminum phosphinate in combination with zinc borate, borophosphate, and nanoclay in polyamide-6
DOĞAN, Mehmet; Bayramlı, Erdal (2014-01-01)
The effect of zinc borate (ZnB), borophosphate (BPO4), and organoclay were studied to improve the flame retardancy of polyamide-6 composites containing organic phosphinates. The flame retardancy of polyamide-6 composites was investigated using limiting oxygen index (LOI), Underwriters Laboratories (UL-94) standard, thermogravimetric analysis, Fourier transform infrared spectroscopy, and mass loss calorimeter. The addition of 15wt% aluminum phosphinate (AlPi) increased the LOI value from 22.5 to 29.5, and V0...
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O. Sivrikaya and A. I. Arol, “ALTERNATIVE BINDERS TO BENTONITE FOR IRON ORE PELLETIZING : PART II : EFFECTS ON METALLURGICAL AND CHEMICAL PROPERTIES,”
HOLOS
, 2014, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/51472.