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low melting slag binders for iron ore pellets

low melting slag binders for iron ore pellets

(PDF) ALTERNATIVE BINDERS TO BENTONITE FOR IRON

Organic binders fail to impart necessary strength to the pre-heated and fired pellets, due to reduced slag-oxide bonding despite producing good quality wet and dry pellets

(PDF) Use of Boron Compounds as Binders in Iron Ore ...

Traditional iron ore pellets are manufactured with the use of bentonite. ... The addition of a low-melting temperature and slag bonding/strength increasing constituent (free in

ALTERNATIVE BINDERS TO BENTONITE FOR IRON ORE

binders through slag bonding mechanism. Furthermore, lowering the firing temperature thanks to low-melting boron compounds will be cost-effective for firing part of the pelletizing plants. KEYWORDS: iron ore pelletizing, bentonite & organic binder, boron compounds, colemanite,

ALTERNATIVE BINDERS TO BENTONITE FOR IRON ORE

The addition of a low-melting temperature and slag bonding/strength increasing constituent (free in acidic contents) into pellet feed 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 iron oxide ...

ALTERNATIVE BINDERS TO BENTONITE FOR IRON ORE

2019-6-2 · fired pellet mechanical strengths of organic binders-bonded pellets. Bentonite is considered as a chemical impurity for pellet chemistry due to acid constituents (SiO 2 and Al 2 O 3). Especially addition of silica-alumina bearing binders is detrimental for iron ore concentrate with high acidic content.

Development of Fluxed Iron Oxide Pellets Strengthened

lime pellets coated with iron oxides (a mixture of mill scale, yellow soil and silica) to enhance slag formation in the BOF. A low-melting slag was formed by iron oxides and a part of burnt lime at the initial stage of blowing. This low melting point slag acted as a seed for further slagging of the lime, which improved the refining efficiency ...

Mineral Reactions and Slag Formation During Reduction

2017-2-6 · quartz and limestone. Quartz reacts with the iron oxides and forms a relatively low melting slag phase of fayalitic composition (Lu et al, 1985). The limestone is completely decomposed in the pelletising process (Niiniskorpi, 2004). Calciumferrites form which increase the strength of pellets in the low temperature reduction (Lu et al, 1985).

The bonding/strengthening mechanism of colemanite

2012-7-18 · Highlights Organic binders and colemanite were tested as alternative binder to bentonite. Colemanite was more effective than bentonite to get sufficient strength. Firing temperature can be lowered with addition of colemanite. Low firing temperatures will be beneficial to save energy in pelletization plants. Bonding mechanism was physical melting at the contact points of iron ore grains.

SAFETY GUIDELINES FOR IRON & STEEL SECTOR

2019-12-13 · The firing of pellets establishes the binding of hematite particles at an elevated temperature ranging from 1,250 to 1,350℃ in oxidizing condition. Slag with a low melting point may form in the pellets during this firing step, if the raw material contains fluxed gangue, or

METALLURGICAL USES FLUXES FOR METALLURGY

2016-3-4 · The function of the slag might vary at different stages within a process prior to final melting. For example, the slag composition and behavior will change as materials descend in the iron blast furnace, or as they melt in the early stages of formation of steel- making slags. Selection of the chemistry for a slag might be in-

Use of Organic Binders and Borates in Pelletizing of Iron ...

Traditional iron ore pellets are manufactured with the use of bentonite. ... and be used successfully as iron ore pellet binders. ... The addition of a low-melting temperature and slag bonding ...

Slag Practice Improvement of the Converter Melting Using ...

2021-5-24 · CONCLUSIONS. (1) Under increased consumption of molten pig iron of 980 kg/t and more, the slag formation process is complicated due to the presence in the slag of refractory compounds (calcium orthosilicate) and a low content of iron oxides. (2) To solve the problem, the technology of iron-ore pellet addition has been developed in the converter ...

Development of Fluxed Iron Oxide Pellets Strengthened

lime pellets coated with iron oxides (a mixture of mill scale, yellow soil and silica) to enhance slag formation in the BOF. A low-melting slag was formed by iron oxides and a part of burnt lime at the initial stage of blowing. This low melting point slag acted as a seed for further slagging of the lime, which improved the refining efficiency ...

ALTERNATIVE BINDERS TO BENTONITE FOR IRON ORE

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

Effect of organic binders on the activation and properties ...

2020-1-16 · In the ironmaking process, the addition of an organic binder to replace a portion of bentonite has the potential to improve the performance of pellets. The interaction between original bentonite (OB) and organic binder was investigated. Results indicated that the micromorphology of organic composite bentonite (OCB) became porous and the infrared difference spectrum exhibited a curved shape.

The bonding/strengthening mechanism of colemanite

2012-7-18 · Highlights Organic binders and colemanite were tested as alternative binder to bentonite. Colemanite was more effective than bentonite to get sufficient strength. Firing temperature can be lowered with addition of colemanite. Low firing temperatures will be beneficial to save energy in pelletization plants. Bonding mechanism was physical melting at the contact points of iron ore grains.

Model studies on the effects of composition differences

2015-6-1 · produces iron ore pellets for DR. The pellets produced contain low amounts of silicon and aluminum, which results in smaller slag amounts when melted in an electric arc furnace (EAF). In order to improve the properties during DR and melting, dolomite is added to the pellets.

SAFETY GUIDELINES FOR IRON & STEEL SECTOR

2019-12-13 · The firing of pellets establishes the binding of hematite particles at an elevated temperature ranging from 1,250 to 1,350℃ in oxidizing condition. Slag with a low melting point may form in the pellets during this firing step, if the raw material contains fluxed gangue, or

Inducible regulation of spherical CaO particle for the ...

2020-2-15 · For the CaO pellet from the carbide slag, the TCS under optimal conditions was 39.67 MPa. However, it was found out that an excess of H 3 BO 3 inducer in the CaO pellets from the carbide slag could produce eutectic calcium borate with a low melting point, resulting in a decreased TCS.

Effect of organic binders on the activation and properties ...

2020-1-16 · In the ironmaking process, the addition of an organic binder to replace a portion of bentonite has the potential to improve the performance of pellets. The interaction between original bentonite (OB) and organic binder was investigated. Results indicated that the micromorphology of organic composite bentonite (OCB) became porous and the infrared difference spectrum exhibited a curved shape.

Model studies on the effects of composition differences

2015-6-1 · produces iron ore pellets for DR. The pellets produced contain low amounts of silicon and aluminum, which results in smaller slag amounts when melted in an electric arc furnace (EAF). In order to improve the properties during DR and melting, dolomite is added to the pellets.

SAFETY GUIDELINES FOR IRON & STEEL SECTOR

2019-12-13 · The firing of pellets establishes the binding of hematite particles at an elevated temperature ranging from 1,250 to 1,350℃ in oxidizing condition. Slag with a low melting point may form in the pellets during this firing step, if the raw material contains fluxed gangue, or

Inducible regulation of spherical CaO particle for the ...

2020-2-15 · For the CaO pellet from the carbide slag, the TCS under optimal conditions was 39.67 MPa. However, it was found out that an excess of H 3 BO 3 inducer in the CaO pellets from the carbide slag could produce eutectic calcium borate with a low melting point, resulting in a decreased TCS.

Development of Fluxed Iron Oxide Pellets Strengthened

lime pellets coated with iron oxides (a mixture of mill scale, yellow soil and silica) to enhance slag formation in the BOF. A low-melting slag was formed by iron oxides and a part of burnt lime at the initial stage of blowing. This low melting point slag acted as a seed for further slagging of the lime, which improved the refining efficiency ...

ALTERNATIVE BINDERS TO BENTONITE FOR IRON ORE

2010-1-31 · alternative binders to bentonite for iron ore pelletizing : part ii : effects on metallurgical and chemical properties 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.

Mineral Reactions and Slag Formation During Reduction

2017-2-6 · quartz and limestone. Quartz reacts with the iron oxides and forms a relatively low melting slag phase of fayalitic composition (Lu et al, 1985). The limestone is completely decomposed in the pelletising process (Niiniskorpi, 2004). Calciumferrites form which increase the strength of pellets in the low temperature reduction (Lu et al, 1985).

Use of Boron Compounds as Binders in Iron Ore

2016-6-11 · Keywords: Iron ore, Pelletization, Agglomeration, Bentonite, Organic binders, Boron compounds, Colemanite. 1. IRON ORE PELLETIZING The main raw material in iron-steel industry is iron ore. Iron ores can be classified as high grade and low grade in terms of their Fe content. High grade iron ores which can be

Pelletizing - an overview | ScienceDirect Topics

2012-1-1 · Green pellets are made by combining moist ore with a binder and rolling it into balls using either a pelletizing disk or a pelletizing drum. The green pellets are then dried, preheated, and finally heated to a temperature below the melting point of iron oxides, approximately 1300 °C, to achieve strength. The fired pellets are typically ...