"low melting slag binders for iron ore pellets"

Softening–melting behavior of mixed burden based on low ...

2020-3-26 · A low MgO content in sinter is conducive to reduce the MgO content in blast furnace slag. This study investigated the effect of MgO content in sinter on the softening–melting behavior of the mixed burden based on fluxed pellets. When the MgO content increased from 1.31wt% to 1.55wt%, the melting temperature of sinter increased to 1521°C.

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

PAPER OPEN ACCESS Related content Characterization …

Characterization of iron ore pellets with dextrin added organic binders under different time and temperature conditions Anand babu kotta*1, Swapan kumar karak1 and M. Kumar1 1Department of Metallurgical and Materials Engineering, National Institute of Technology, Rourkela, Orissa, India

Effect of an organic binder and copper slag on ...

SYNOPSIS Ammasi. A Traditionally, bentonite is used as the most common binder in iron ore pelletization from the very beginning. It gives good bonding property to green and dry pellets at ambient as well as elevated temperature. However, bentonite contains around 60% silica and 18 % alumina that proportionally increase the alumina and silica content in pellet and increases slag volume and ...

(PDF) Use of colemanite as an additive in iron ore pelletizing

Colemanite has the chemical formula Ca 2 B 6 O 11 .5H 2 O, with a melting point of 986°C [9], and forms borosilicate slag bonds at low temperatures (approximately 1000°C) in the presence of ...

Appendix 1 – Individual Schedules of Solid Bulk Cargoes

2021-2-11 · SEED CAKE, containing vegetable oil UN 1386 (b) solvent extractions and expelled seeds, containing not more than 10% of oil and when the amount of moisture is higher than 10%, not more than 20% of oil and moisture combined. SEED CAKE UN 2217 with not more than 1.5% oil …

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.

Slag Practice Improvement of the Converter Melting Using ...

2021-5-24 · The addition of iron-ore pellets allows for the formation of free-running slag at the beginning of the heat blowing by increasing the content of iron oxides in the slag. Thus, no faults with the slag practice and leakage of the slag–metal emulsion have been found in the heats with the minimum consumption of scrap metal.

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, …

(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 …

Investigation on reduction of cement binder in cold …

1997-2-1 · Research and Development centre for Iron and Steel, Steel Authority of India Limited, established the suitability of cement bonded iron ore pellets as burden material for low and moderate shaft furnaces (Minerals and Metals Review, 1981). The pellets exhibiting crushing strength of around 130–160 kg/pellet were prepared by using around 10% ...

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 ...

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.

Effect of Slag Composition on Iron Nuggets Formation …

For the reduction-melting experiments, composite pellets were prepared in order to keep the Fe 2 O 3: C ratio equals to 1:3 (carbon necessary for the reduction reactions) plus the amount of carbon corresponding to 5% of the iron, for carburizing the metal. The iron ore –graphite mixture was composed of 79.9% iron ore and 20.1% graphite.

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 …

(PDF) Study of Softening and Melting Behaviour of Iron …

increase of apparent viscosity due to densification of plastic mass and formation of metallic sponge; 2.2 Identification of the Softening and Melt-down Indices 4. rapid decrease of apparent viscosity due to melting of from the Shrinkage Data the iron sponge and separation of metal and slag to High-temperature process of viscous-plastic flow of ...

(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 acidic contents ...

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

Alcotac – synergistic organic binders

2020-3-25 · at a very low use level (approx. 200 g per ton of ore, or even less). Alcotac® FE binders are added to the concentrate feed in powder form, therefore, no special mixing equipment is required on site to make up solutions. Fig. 4: Iron ore pellets produced from a magnetite ore in the lab

Effect of molasses binder on the physical and mechanical ...

2018-4-6 · Molasses was used as an alternative binder to the bentonite binder. The change in moisture absorption by pellets prepared with different iron ores and different molasses contents were investigated. Iron ore properties exerted the major effect on pellet behavior and final pellet quality. The absorbed moisture content of pellets prepared without binder, bentonite-added pellets, and molasses ...

ALTERNATIVE BINDERS TO BENTONITE FOR IRON ORE …

Therefore, addition of boron compound is beneficial to recover the low physical-mechanical qualities of pellets produced with organic binders through slag bonding mechanism. Furthermore, lowering the firing temperature thanks to low-melting boron compounds will be …

Influence of basicity on metallurgical performances of ...

2021-7-17 · Lots of studies have indicated that the low melting point slag phases can facilitate the reduction swelling of iron ore pellets [21,22,23, 26]. In this study, the fired pellets at the basicity of 0.40 and 0.60 show higher RSI value and lower RI value than the fired pellets at natural basicity and basicity of 1.00 (Fig. 4 ) because they contain ...

Utilization of Lime Fines as an Effective Binder as well ...

2015-6-19 · A laboratory study was carried out to characterize the physical, chemical and mechanical properties of lime fluxed (varying basicity 0–2) hematite iron ore pellets. Lime was used as additive as well as fluxing agent for making iron ore pellets. The effect of additives on different properties of 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 …

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.

Study of Organic and Inorganic Binders on Strength of …

2013-4-11 · Bentonite is a predominant binder used in iron ore pelletization. However, the presence of a high content of silica and alumina in bentonite is considered undesirable for ironmaking operations. The objective of this study was to identify the alternatives of bentonite for iron ore pelletization. To achieve this goal, different types of organic and inorganic binders were utilized to produce iron ...

Effect of slag composition on iron nuggets formation from ...

This experimental series pellets containing iron ore, graphite and slag forming components were used, for high and low liquidus temperature slags. In the former case, the pellet with 7% Portland ® cement, and in the later 7% with a mixture of Portland ® cement, silica and alumina. Table 2 shows the expected composition of the slags.

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).