Study of an Organic Binder of Cold-Bonded Briquettes with Two Different Iron Bearing Materials

Li, Ying; Chen, Huiting; Hammam, Abourehab; Han, Wei; Nie, Hao; Ding, Weitian; Omran, Mamdouh; Yan, Lixiang; Yu, Yaowei

doi:10.3390/ma14112952

Cited by 10 publications

(10 citation statements)

References 25 publications

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“…The reduction disintegration index (RDI) of RDI þ3. 15 and compressive strength after RDI experiment of CBB are higher than that of the sinter. For microscopic morphologies after RDI experiment, cracks initiate in the area of the return fines but do not propagate through the whole matrix of CBB.…”

Section: Introductionmentioning

confidence: 74%

“…[ 27 ] According to our previous research, the starch decomposes at about 340 °C. [ 15 ] Therefore, the strength of CBB decreases sharply when the temperature exceeds 340 °C. As for bentonite CBB, on the one hand, a lot of water is squeezed out during the briquetting process, which affects the absorption behavior of bentonite, while it has an important impact on the bonding performance of bentonite.…”

Section: Resultsmentioning

confidence: 99%

“…According to the previous research, the organic binder loses its bonding effect at about 340 °C, so the compound binder can show the bonding effect from room temperature to 1100 °C. [ 15 ] It is worth noting that the phase of CaH 2 O 4 Si does not appear in Figure 16 as CaH 2 O 4 Si is an unbalanced phase.…”

Section: Resultsmentioning

confidence: 99%

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Study on Properties of Cold‐Bonded Briquettes Prepared from Return Fines of Sinter

Liu

Xiong

Zang

et al. 2022

steel research int.

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Return fines of sinter (return fines) are used to prepare cold‐bonded briquettes (CBBs). The reduction disintegration index (RDI) of RDI+3.15 and compressive strength after RDI experiment of CBB are higher than that of the sinter. For microscopic morphologies after RDI experiment, cracks initiate in the area of the return fines but do not propagate through the whole matrix of CBB. The reduction index (RI) of CBB is lower than that of the sinter; conversely, the compressive strength of CBB after RI experiment is higher than that of the sinter. For phase composition after RI experiment, there are phases of metallic iron, wüstite, and silicate in the periphery part, whereas there are calcium ferrite, wüstite, and silicate in the core part. The reduction behavior of CBB can be improved by decreasing the volume of CBB and adding coke in the CBB. The return fines are bonded by the compound binder in two ways: forming a mutually interlaced reticular structure and a dense and acicular solid connecting bridge. For the phase change of the compound binder with temperature, the total content of bredigite is above 63% at 300 to 1100 °C; moreover, the phases of melilite, Ca2(Al, Fe)2O5, and Ca(Al, Fe)2O4 appear respectively at different temperatures as new bonding phases.

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Section: Introductionmentioning

confidence: 74%

Section: Resultsmentioning

confidence: 99%

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Study on Properties of Cold‐Bonded Briquettes Prepared from Return Fines of Sinter

Liu

Xiong

Zang

et al. 2022

steel research int.

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“…Recently, the cold-bonding technique has been considered as a potential method to treat powder materials [ 13 , 14 , 15 ], and its merits are in environmental production and low consumption [ 16 ]. It is generally used in various fields such as solid waste utilization [ 17 ], coal briquette making [ 18 ], and metallurgy engineering [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

“…In contrast, using an organic binder can provide excellent compressive strength to the briquette at room temperature. However, the compressive strength of the briquette decreases quickly due to the decomposition of organic binder under high temperatures [ 16 ].…”

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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Reduction Kinetics of Cold‐Bonded Briquette Prepared from Return Fines of Sinter with Carbon Monoxide and Coke

Ren

Han

et al. 2023

steel research int.

Self Cite

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Return fines of sinter is now being utilized in blast furnaces straight after cold briquetting, a novel method of return fines utilization. [1][2][3][4] This technique can prevent return fines from being repeatedly sintered at high temperatures. On the one hand, it can lower the amount of energy used by the sinter plant, and on the other, it can increase the output of the sintering process. The compressive strength, reduction degradation index, and reducibility index of coldbonded briquette prepared from return fines are close to those of the sinter, which is acceptable for use in a large blast furnace. Cold-bonded briquette prepared from return fines has successfully substituted 5-10% of the sinter in a 2800 m 3 blast furnace in Gansu Province, China. [1,4] However, the lack of knowledge regarding the cold-bonded briquette prepared from return fines' reduction kinetics in the blast furnace prevents further advancements in the cold-bonded briquette prepared from return fines' utilization ratio.Numerous studies have investigated the reduction kinetics of sinter under varying conditions. The sinter's porosity, particle size, and chemical composition affect its reduction kinetics. [5] For instance, sinter with greater porosity or with a large number of microscopic pores is usually reduced more quickly because the pores enable the reducing gas to reach the reaction's interface. However, macropores (>0.125 mm) are more crucial than micropores for the increased reduction rate of sinter because the reduction front of fine pores (<0.125 mm) is complex and irregular. [6] The reduction rate usually increases with the decreasing particle size of the sinter, and varied iron

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Study of an Organic Binder of Cold-Bonded Briquettes with Two Different Iron Bearing Materials

Cited by 10 publications

References 25 publications

Study on Properties of Cold‐Bonded Briquettes Prepared from Return Fines of Sinter

Study on Properties of Cold‐Bonded Briquettes Prepared from Return Fines of Sinter

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

Reduction Kinetics of Cold‐Bonded Briquette Prepared from Return Fines of Sinter with Carbon Monoxide and Coke

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