An efficient method for iron ore sintering with high-bed layer: double-layer sintering

Zhong, Qiang; Liu, Huibo; Xu, Liangping; Zhang, Xin; Rao, Mingjun; Peng, Zhiwei; Li, Guanghui; Jiang, Tao

doi:10.1007/s42243-021-00576-4

Cited by 15 publications

(5 citation statements)

References 14 publications

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“…A laboratory-scale sintering pot with a height of 900 mm and a diameter of 200 mm was used, as shown in Figure 2. The sintering process included proportioning, mixing, granulating, charging, igniting, sintering, cooling, crushing, sieving, and testing [5,6,25,26]. Firstly, the raw materials were blended.…”

Section: Methodsmentioning

confidence: 99%

“…The tumbler index is the mass of the sinter > 6.3 mm divided by the original mass of 7.5 kg put into a tumbler for 8 min (%), based on the methodology outlined in ISO3271. Productivity is the production capacity that sintering machines could reach at a specific area and time (t•m −2 •h −1 ) [5,6]. The reduction disintegration index (RDI) is an important metallurgical property of the finished sinter.…”

Section: Methodsmentioning

confidence: 99%

“…The blast furnace process is the dominant ironmaking route to supply the feedstocks for steelmaking [1][2][3][4]. For BF ironmaking, more than 75% of its iron-containing burden is iron ore sinter, which is produced by sintering a mixture of iron ore fines with the additions of flux (e.g., limestone), solid fuel (e.g., coke breeze), and return fines (recycled sinter with a particle size smaller than 5 mm) [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Silica Content on Iron Ore Sintering

Liu,

Jiang,

Cheng

et al. 2023

Metals

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During the iron ore sintering process, its SiO2 content considerably affects the sinter quality. In this study, the effect of SiO2 content on iron ore sintering indexes was studied, with mineral composition and microstructure analyses. It was shown that the strength and reducibility of sintering products improved when SiO2 content increased. The sinter yield and tumbler index increased from 69.57% and 58.67% to 74.02% and 62.32%, respectively, with SiO2 content increasing from 3.92% to 5.12%. Moreover, the reduction disintegration index (RDI+3.15) increased from 66.50% to 68.28%. There was a quadratic function relationship between SiO2 content (x) and RDI+3.15 (y): y = −0.4841x2 + 5.8932x + 50.8189. Maintaining the SiO2 content in the range of 4.52% to 5.12% would promote the formation of compound calcium ferrite (SFCA) and silicate as the main binding phase which determined the quality of sintering products.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Silica Content on Iron Ore Sintering

Liu,

Jiang,

Cheng

et al. 2023

Metals

Self Cite

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“…Process control has also become an effective way to reduce CO 2 emissions. Therefore, innovative technologies developed in recent decades have been generally accepted and put into production in sintering plants, such as sintering flue gas recirculation [53 − 56], stand-support sintering [45, 57 − 58], gaseous fuel injection [59 − 62] and double-layer ignition sintering [34,63]. It was reported that CO emissions could be reduced by 22.06% with the application of sintering flue gas recirculation technology [25].…”

Section: Introductionmentioning

confidence: 99%

Intensive carbon combustion in sintering packed bed via steam spraying: An experimental study on carbon monoxide emission reduction

Sun

Zhou

et al. 2023

J. Cent. South Univ.

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Improving the combustion efficiency of solid fuels is important for reducing carbon monoxide emissions in the iron ore sintering process. In this paper, the surface steam spraying technology is introduced in the sintering process based on the auxiliary combustion effect of steam on coke, and its potential to reduce carbon monoxide emissions is demonstrated. Thermogravimetric analysis experiments of coke breeze in air and air-steam mixed atmosphere are carried out, and the results show that the introduction of steam can reduce the concentration of carbon monoxide in exhaust gases from 183×10 −6 to 78×10 −6 . At the same time, the mechanisms of carbon monoxide emission reduction by surface steam spraying technology are analyzed from the thermodynamic and kinetic perspectives. Then, a series of laboratoryscale sintering pot tests are carried out under no spraying operation, interval spraying operation, and continuous spraying operation. The results indicate that both intervally and continuously spraying operations can reduce carbon monoxide emissions. The optimal mode of steam spraying under the present experimental conditions is continuously spraying for 13 min at a volume rate of 0.053 m 3 /min. Compared with no spraying, the average carbon monoxide concentration in the exhaust gas is reduced from 7565×10 −6 to 6231×10 −6 , and total carbon monoxide emissions for per ton sinter are reduced from 13.46 m 3 /t to 9.51 m 3 /t.

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“…The double-layer ignition sintering method [34] makes full use of the lower sinter, itself containing a reduction in the catalyst composition, using less high-temperature sintering ore in the sintering process, as denitration catalysts, effective in the sintering process of NO x catalytic reduction, environmental protection, and synchronous sintering and denitration online, ensure the efficiency of sintering and the demand of the catalyst and greatly reduce the sintering process of denitration operation costs.…”

Section: Introductionmentioning

confidence: 99%

Study on Double-Layer Ignition Sintering Process Based on Autocatalytic Denitrification of Sintering Layer

et al. 2021

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An efficient sintering process was proposed based on the autocatalytic denitrification of the sintered ore. The catalytic denitrification of sintered ore, the effect of double-layer ignition sintering process on the emission reduction in nitrogen oxides, and the impact on the quality of sintered ore were studied. The results showed that the catalyzed reduction of NO with sinter ore as a catalyst has a significant effect; when the airspeed reaches 3000 h−1, the temperature is 500 °C, and the conversion rate of NO can reach 99.58%. The sinter yield of double-layer ignition sintering is increased, solid fuel consumption is slightly reduced, falling strength is slightly increased, and drum strength is slightly decreased. Under the conditions of layer height proportion of 320/400 mm (lower/upper) and ignition time interval of 10 min, the yield, drum strength, shatter strength, and solid fuel consumption reached 61.60%, 54.82%, 46.75%, and 69.55%, respectively. NOx concentration under the 16% baseline oxygen content (c(NOx)’) in the flue gas of double-layer ignition sintering is reduced to a certain extent, and the generation time of NOx is greatly shortened. The double-layer ignition sintering process can reduce the emission of nitrogen oxides in the sintering process under the condition of guaranteeing the quality of sinter, which has great economic and environmental benefits.

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An efficient method for iron ore sintering with high-bed layer: double-layer sintering

Cited by 15 publications

References 14 publications

Effect of Silica Content on Iron Ore Sintering

Effect of Silica Content on Iron Ore Sintering

Intensive carbon combustion in sintering packed bed via steam spraying: An experimental study on carbon monoxide emission reduction

Study on Double-Layer Ignition Sintering Process Based on Autocatalytic Denitrification of Sintering Layer

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