A study of pre-briquetting granulation sintering of the mixtures with high ratio of Brazilian specularite concentrate

Zhu, Deqing; Guo, Zhengqi; Pan, Jian; Zhang, F.

doi:10.1080/03019233.2016.1219542

Cited by 13 publications

(7 citation statements)

References 9 publications

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“…[ 16 ] For the CBB with 7% and 10% sodium silicate, the RDI +3.15 is more than 60%, which meets the requirements of blast furnace;; however, the value of RDI −0.5 is too high to meet the requirements. [ 27 ] It can be seen from Figure 4d, CBB of starch and bentonite have no strength after the RDI test, while the CBB strength of sodium silicate is more than 160 N. It is illustrated that sodium silicate can consolidate sinter particle at 500 °C and improve the thermal strength of CBB. Sodium silicate separates out the silica acid gel after dewatering and hardening at high temperature.…”

Section: Resultsmentioning

confidence: 96%

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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: Resultsmentioning

confidence: 96%

“…[ 26 ] Figure 4c shows the RDI value of CBB, and the RDI +3.15 value of starch and bentonite is below 60% which can't meet the requirements of blast furnace. [ 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.…”

Section: Resultsmentioning

confidence: 99%

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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“…Several works have been developed trying to attenuate the impact of the fines on the sintering bed permeability. These include new routes of cold agglomeration, optimization of water [15], binder additions [16], and pre-briquetting [17]. Recently, some authors [18,19] have also suggested decreasing particle size of adherents as an alternative to improve granulation performance.…”

Section: Introductionmentioning

confidence: 99%

Granulation behaviour of a sinter mixture with high additions of pellet feed and ground pellet feed

Lopes

Flores

Oliveira

et al. 2020

Ironmaking & Steelmaking

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The present study investigated the influence of high proportions of pellet feed (two different particle sizes) on the cold agglomeration behaviour of a sinter mixture and the properties of the granules. Using high proportions of adherent particles (pellet feed) lead to a decrease in the mixtures' mean diameter, producing wider size distributions with higher contents of granules below 1 mm. The bed permeability was impaired for higher additions of pellet feed, which correlated with the alterations of granules size distribution. Degradation tests so simulate handling and transported sharply affected granules size distribution and permeability, showing that larger granules are more susceptible to degradation. Moreover, both the ratio and the size distribution of the pellet feed were found to influence the granulation mechanism to different extents. Using finer adherent particles at adherents/nuclei ratios bigger than 50% changed the agglomeration mechanism from layering towards a combination of coalescence and layering.

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“…Owing to the poor granulation behaviour of iron concentrates, its usages in the traditional sintering process are greatly limited. Meanwhile, in order to improve the quality of the agglomeration products, some methods such as increasing the proportion of limes in sintering mixture and pre-treating iron concentrates through mechanical activation should be proposed to improve the iron concentrates granulation [4][5][6][7]. However, the presence of unreacted limes has a negative effect on metallurgical properties (especially disintegration during reduction) as well as on strength.…”

Section: Introductionmentioning

confidence: 99%

Effective preparation of blast furnace burdens from superfine iron concentrates by composite agglomeration process

Zhang

et al. 2019

Ironmaking & Steelmaking

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In this study, the composite agglomeration process (CAP) was verified to be an effective route for preparing blast furnace burdens from superfine iron concentrates. It was found that under the conditions of moisture content of matrix feed 8.2 wt-%, coke breeze dosage of 4.0 wt-%, pelletized feed proportion of 40 wt-% and composite basicity (CaO/SiO 2 ) of 1.98, a sintering yield of 82.11 wt-%, tumbler index of 71.33 wt-% and productivity of 1.83 t (m 2 h) −1 were achieved by CAP, which is 14.38, 14.55 and 22.82% higher than that by traditional sintering process (TSP), respectively. Meanwhile, the CAP decreased the solid fuel consumption by 5.6 kg coke /t product . The metallurgical properties results showed that the CAP product could be used as high-quality blast furnace burdens. Owing to the excellent agglomeration indexes and low solid fuel consumption, the CAP is expected to have widespread applications in the preparation of blast furnace burdens from superfine iron concentrates.

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A study of pre-briquetting granulation sintering of the mixtures with high ratio of Brazilian specularite concentrate

Cited by 13 publications

References 9 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

Granulation behaviour of a sinter mixture with high additions of pellet feed and ground pellet feed

Effective preparation of blast furnace burdens from superfine iron concentrates by composite agglomeration process

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