Cold Bonding of Iron Ore Concentrate Pellets

Halt, Joseph A.; Roache, Samuel C.; Kawatra, S. Komar

doi:10.1080/08827508.2013.873863

Cited by 47 publications

(12 citation statements)

References 15 publications

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“…Meanwhile, the strength of sintered pellets is mostly determined by the sintering conditions. A high sintering temperature is generally favoured for strong sintered pellets, however, supplying this heat consumes a significant amount of energy [24], [25]. In addition, the use of binders is important in the pelletizing process because it can enhance the strength of pellets from the green state to the final sintered product.…”

Section: Pelletization Of Iron Orementioning

confidence: 99%

“…Cements require a period of time (curing time) to develop their full strength, unlike bentonite binders that act rapidly. For a more rapid curing, accelerating reagents can be used, or the curing condition can be optimized by increasing the temperature and humidity [24]. The most common cementitious compound is ordinary Portland cement (OPC).…”

Section: Cementitious Materialsmentioning

confidence: 99%

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Pelletization and sintering of New Zealand titanomagnetite ironsand

Mendoza

Yin

Zhang

et al. 2022

Advanced Powder Technology

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Section: Pelletization Of Iron Orementioning

confidence: 99%

Section: Cementitious Materialsmentioning

confidence: 99%

Pelletization and sintering of New Zealand titanomagnetite ironsand

Mendoza

Yin

Zhang

et al. 2022

Advanced Powder Technology

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“…It is generally used in various fields such as solid waste utilization [ 17 ], coal briquette making [ 18 ], and metallurgy engineering [ 19 ]. Due to the simple flow [ 20 ], the importance of the cold-bonding technique development has been the focus of increased attention. Powders, binders, and water are mixed, and the mixture is then molded into wet briquettes under various pressures.…”

Section: Introductionmentioning

confidence: 99%

A Novel Method of Si and Si3N4 Powder Resources Recycling: Cold Bonding Briquettes

Xiong

Chen

et al. 2022

Materials

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Silicon nitride (Si3N4) and silicon powder (Si) are two kinds of harmful solid waste in industrial production. As an environmental and low-consumption method, the cold-bonding technique is a novel method to utilize the problem of powder resource cycling. In this experiment, mechanical and high-temperature properties of Si and Si3N4 briquettes were studied after cold bonding. The results are as follows: (1) The compressive strength of the Si and Si3N4 briquettes increased with the improvement of molding pressure. With the same binder (1 wt.%) and water (10 wt.%) addition, the compressive strength of the Si3N4 briquette arrived at 12,023.53 N under 40 Mpa molding pressure, which is much higher than that of the Si briquette (942.40 N). The Si particles are uneven and irregular, which leads to an intense arch bridge effect in the Si briquette and the compressive strength decrease. Compared with Si powder, the particle size and shape of Si3N4 is small, uniform, and regular. The influence of the arch bridge effect is smaller than that in the Si briquette. (2) After being treated at 1473 K for 1 h, the compressive strength of the Si briquette increased to 5049.83 N, and the compressive strength of the Si3N4 briquette had a slight change. The surface of the briquettes was contacted with oxygen and reacted to form an outer shell which mainly contains SiO2 in the high-temperature treatment. FT-IR results have shown there were no extra impurities in cold-bonded briquettes when using the organic binder. (3) The microstructure of the cross section of the Si and Si3N4 briquettes after high-temperature treatment presented that oxygen entered the briquette through the pores and continued to react with the Si and Si3N4. The outer shell of the Si briquette grew and thickened continuously with the oxygen spreading in the Si briquette. However, because of the smaller particle size and regular shape, little oxygen diffused in the Si3N4 briquette. The outer shell of the Si3N4 briquette is fairly thin, so the compressive strength did not change too much.

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“…It may be mentioned that investigators have tried to use cold bonding agents like portland cement (Halt et al 2015) and fly ash (Eisele et al 2017) to avoid high temperature induration. In hematite pellet induration, as there is no exothermic heat release, heat can be supplied by adding magnetite ore, coke fines, etc.…”

Section: Introductionmentioning

confidence: 99%

Mill scale as a potential additive to improve the quality of hematite ore pellet

Rajshekar

Pal

Venugopalan

2017

Mineral Processing and Extractive Metallurgy Review

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Hematite pellet is required to be indurated at very high temperature to achieve its good strength as there is no exothermic heat of oxidation unlike magnetite. As mill scale contains mainly FeO and Fe 3 O 4 , any minor amount of its addition in pellet can provide in situ heat and enhance diffusion bonding and sintering. In this study, the mill scale generated in steel plant is added as magnetite input in hematite pellet both in acidic and in basic condition. It has been found that in fluxed pellet, mill scale can improve the properties of pellet. In acidic pellet, the induration temperature has been reduced to a great extent (1250-1275°C) and all properties have been found to be improved due to the addition of 15% mill scale. Mill scale shows enough potential to eliminate the flux addition in producing blast furnace quality pellet from hematite ore. Thus, the flux free acidic pellet has been developed even at very low temperature (1275°C) of induration.

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Cold Bonding of Iron Ore Concentrate Pellets

Cited by 47 publications

References 15 publications

Pelletization and sintering of New Zealand titanomagnetite ironsand

Pelletization and sintering of New Zealand titanomagnetite ironsand

A Novel Method of Si and Si3N4 Powder Resources Recycling: Cold Bonding Briquettes

Mill scale as a potential additive to improve the quality of hematite ore pellet

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