Composition of Iron-Ore Pellets with Different Types of Additives

Chizhikova, V. M.; Vainshtein, R. M.

doi:10.1023/b:mell.0000015261.33342.21

Cited by 9 publications

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“…However, these studies do not explain how organic binders act to improve the properties of the pellets. [27] Source: elaborated by the author with data from [8,[18][19][20][21][22][23][24][25][26][27]. Table 4.…”

Section: Iron Ores and Iron Oxide Materialsmentioning

confidence: 99%

Iron Ore Pelletizing Process: An Overview

Moraes¹,

Lima²,

Ribeiro³

2018

Iron Ores and Iron Oxide Materials

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The iron ore production has significantly expanded in recent years, owing to increasing steel demands in developing countries. However, the content of iron in ore deposits has deteriorated and low-grade iron ore has been processed. The fines resulting from the concentration process must be agglomerated for use in iron and steelmaking. This chapter shows the status of the pelletizing process with a special focus on binders. Bentonite is the most used binder due to favorable mechanical and metallurgical pellet properties, but it contains impurities especially silica and alumina. The importance of many researches concerning alternative binders is also discussed in this chapter. Better quality wet, dry, preheated, and fired pellets can be produced with combined binders, such as organic and inorganic salts, when compared with bentonite-bonded pellets. While organic binders provide sufficient wet and dry pellet strengths, inorganic salts provide the required preheated and fired pellet strengths.

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Section: Iron Ores and Iron Oxide Materialsmentioning

confidence: 99%

Iron Ore Pelletizing Process: An Overview

Moraes¹,

Lima²,

Ribeiro³

2018

Iron Ores and Iron Oxide Materials

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“…Polyacrylamide wetted by water molecules formed long molecular chains and provided strength in pellet. However, when the pellets were heated to 105°C, organic binder burnt out or evaporated resulting a highly porous pellet (Chizhikova and Vainshtein 2003). Organic binders viz.…”

Section: Replacement Of Bentonite In Iron Ore Pelletmentioning

confidence: 99%

Innovative Development on Agglomeration of Iron Ore Fines and Iron Oxide Wastes

Pal

2018

Mineral Processing and Extractive Metallurgy Review

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In steel industry and in mines, a significant amount of ultra-fines waste iron oxides and iron ore fines is generated. Utilizations of these fines are required to reduce the environmental hazards and conserve the natural resources. Some of these fines are normally used in sintering practice. However, sintering has a limitation of accepting ultra-fines materials. Pelletizing can use ultra-fine iron oxides. However, suitable technology is required for preparation of good quality pellets. Some of the fines, viz. blast furnace (BF) flue dust, Linz Donawitz (LD) converter sludge etc., are not suitable due to their high alkali and Zn content. Some other material like slime is not considered to be suitable in normal pelletizing practice, because of its high alumina and silica content and excessively fine size. On the other hand mill scale and blue dust have poor green bonding property. Therefore, suitable technologies are required to be developed for their utilization/recycling. This paper discusses the various technologies developed such as (i) developing flux for basic oxygen steelmaking process, (ii) improved pelletizing practice for better reducibility, lower reduction degradation and replacing bentonite binder, and (iii) special quality sinters for improving micro-fines utilization. These technologies may have very good application potential.

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“…However, when the pellets were heated to 105uC, the organic binder burnt out or evaporated resulting in a highly porous pellet. 9 Organic binders, namely starch, dextrin and alginate, were found to provide good green drop number and dry compressive strength, but they failed to improve the strength in a region of high temperature because these additives were burnt off before commencing recrystallisation due to which widespread application in production of fired pellet has not been found. 10 The organic binders, hemicellulose, Na lignosulphonate (NLS) and lactose monohydrate were also able to provide good green as well as strong indurated pellets.…”

Section: Introductionmentioning

confidence: 99%

Replacement of bentonite in hematite ore pelletisation using a combination of sodium lignosulphonate and copper smelting slag

Ayyandurai

Pal

2016

Ironmaking & Steelmaking

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Bentonite is the most common binder used in iron ore pelletisation owing to its good bonding properties in green and dry pellets at both ambient and elevated temperatures. However, due to its high alumina and silica content, it increases the slag volume and energy consumption in downstream processes. Organic binders may be used to replace bentonite; however, they fail to provide strength at a high temperature (700-9008C) due to poor thermal stability during pellet induration. In the present study, an organic binder Na lignosulphonate (NLS) has been used along with copper smelting slag (Cu-SS). FeO in Cu-SS provides diffusion bonding at high temperature and maintains the strength of pellets even after evaporation/burning of NLS. It also enhances recrystallisation bonding at relatively lower temperature to provide good strength. The study has been carried out with hematite ore and varying amounts of NLS and Cu-SS. Copper smelting slag (1.0%) addition with 0.5%NLS has been found to be optimum to provide very good green properties and ,300 kg/pellet cold crushing strength (CCS) at 12508C induration temperature. However, hematite pellets of similar basicity with 0.5% bentonite requires higher induration temperature (13008C) to achieve a similar CCS. The developed pellet also shows better reducibility (80%), similar reduction degradation index (18%) and swelling index (10%) to the usual bentonite pellet. Thus, the induration temperature of hematite pellet has been lowered by 508C using a combination of NLS and Cu-SS eliminating bentonite completely, which can provide a considerable energy and cost saving.

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Composition of Iron-Ore Pellets with Different Types of Additives

Cited by 9 publications

References 0 publications

Iron Ore Pelletizing Process: An Overview

Iron Ore Pelletizing Process: An Overview

Innovative Development on Agglomeration of Iron Ore Fines and Iron Oxide Wastes

Replacement of bentonite in hematite ore pelletisation using a combination of sodium lignosulphonate and copper smelting slag

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