A laboratory-based investigation into the catalytic reduction of NO<i><sub>x</sub></i>in iron ore sintering with flue gas recirculation

Gan, Min; Fan, Xiaohui; Yu, Zhibin; Chen, X. L.; Ji, Zhiyun; Lv, Wei; Liu, S.; Huang, Yunsong

doi:10.1080/03019233.2015.1136114

Cited by 18 publications

(12 citation statements)

References 10 publications

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“…The generation of oxygen vacancies in iron oxide had a strong activity lattice of O 2− , which caused the reduction of NO [40].…”

Section: Methodsmentioning

confidence: 99%

“…(2) NO is adsorbed on low iron oxide and REDOX reaction is carried out; (3) NO reacts with ferrous oxide to form N 2 [40]. Meanwhile, the concentrations of NO and CO decreased owing to the catalytic reaction between NO-CO and Ca-Fe oxides [35].…”

Section: Effect Of Space Velocity On Catalytic Reduction Of No In Sintered Orementioning

confidence: 99%

“…Since calcium ferrite had the structure of spinel, and CO had fewer electrons in their valence shell than NO, it was easily absorbed on calcium ferrite, which was advantageous to reduce calcium ferrite [41]. The generation of oxygen vacancies in iron oxide had a strong activity lattice of O 2− , which caused the reduction of NO [40].…”

Section: Effect Of Space Velocity On Catalytic Reduction Of No In Sintered Orementioning

confidence: 99%

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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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“…The generation of oxygen vacancies in iron oxide had a strong activity lattice of O 2− , which caused the reduction of NO [40].…”

Section: Methodsmentioning

confidence: 99%

Section: Effect Of Space Velocity On Catalytic Reduction Of No In Sintered Orementioning

confidence: 99%

Section: Effect Of Space Velocity On Catalytic Reduction Of No In Sintered Orementioning

confidence: 99%

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

et al. 2021

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“…Iron ore sinter plants contribute to most of the emissions in Steel Plants (Fan et al 2014;Han et al 2014Han et al , 2019Gan et al 2016). It is important to understand the underlying reasons from the sustainability point of view and avoid closure.…”

Section: Introductionmentioning

confidence: 99%

Characterization and abatement of SOx, NOx and PCDD/Fs in iron ore sinter machine wind legs

Angalakuditi

Gujare

Anbarasu

et al. 2021

Preprint

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It was observed that SOx and NOx, in large concentrations, are getting released from certain wind boxes below the sinter machine. The particulates released from specific wind legs were characterized using Quantitative Evaluation of Materials by Scanning Electron Microscopy (QEMSCAN). Particulates with spherical, cubical, needle and bar-like morphologies containing K, Na, Cl were found. Nitrogen-based solids were found in clutter-like morphology. Some particles had a mixture of the above, SOx and NOx. A method of dissolving SOx, NOx and breaking them down into harmless substances was explored in this research. The deposits in the wind legs were dissolved in demineralized water and solutions of sodium bicarbonate, urea, and di-sodium borate deca-hydrate (borax) to estimate the absorbance of K, Na, Cl, Ca, Mg, S, and N based compounds present. Demineralized water and sodium bicarbonate were found to be the most effective sorbents of SOx and NOx. The filtrates were examined under QEMSCAN and found that SOx and NOx are not present. Based on the above finding, a solution of sodium bicarbonate and water 0.01% v/v was sprayed into a wind box and found that SOx and NOx have got reduced by about 55%. To maximize the capture of SOx and NOx, the solution was optimized at 0.02% v/v. With this novel technique, capital intensive Desulphurization (De-SOx) and Denitrification (De-NOx) installation can be avoided. Additionally, an economical solution to the Polychlorinated dibenzo para-dioxins and polychlorinated dibenzofurans (PCDD/Fs) emission was explored in this research. Various physicochemical mechanisms of forming harmful substances are described in this paper.

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“…Compared with researches on bulk fayalite, nanoscale fayalite need to be studied further, especially in the field of functional materials and catalysis. Application of fayalite has been reported in carbon nanotube growth, catalytic reduction of NO x , methane‐steam and tar‐steam reforming, and photo‐catalytic reactions . It is widely accepted that the domains of nanometer size play a crucial role in heterogeneous catalysis.…”

Section: Introductionmentioning

confidence: 99%

Facile Large‐Scale Synthesis of Nanoscale Fayalite, α‐Fe₂SiO₄

Chang

Zhang

et al. 2017

ChemistrySelect

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Fayalite has been found various applications in many fields. However, it is scarce in Earth's crust. Most of the preparation methods reported earlier are slightly rigorous or complicated and mainly used for preparing large crystal or single crystal fayalite. Because of the potential applications in the field of functional materials and catalysis, nanoscale fayalite would be interesting and attractive. Herein we designed a new method to synthesize nanoscale α‐Fe2SiO4 via a H2‐assisted gas‐solid reaction. We have used three different approaches based on the above method. The highly dispersed precursor, which was prepared by a continuous co‐precipitation method, was heated to a phase‐transition temperature (∼600 °C) under H2 atmosphere to synthesize nanoscale α‐Fe2SiO4. The fayalites were characterized by XAD, XAS and FT‐IR. Comparing with the earlier reported methods, our method largely reduces the reaction temperature, and facilitates large scale synthesis of nanoscale fayalite. It is found that the well distribution of Fe−O and Si−O domains in a nanometer scale plays an important role in the preparation.

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A laboratory-based investigation into the catalytic reduction of NO_xin iron ore sintering with flue gas recirculation

Cited by 18 publications

References 10 publications

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

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

Characterization and abatement of SOx, NOx and PCDD/Fs in iron ore sinter machine wind legs

Facile Large‐Scale Synthesis of Nanoscale Fayalite, α‐Fe₂SiO₄

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A laboratory-based investigation into the catalytic reduction of NOxin iron ore sintering with flue gas recirculation

Cited by 18 publications

References 10 publications

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

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

Characterization and abatement of SOx, NOx and PCDD/Fs in iron ore sinter machine wind legs

Facile Large‐Scale Synthesis of Nanoscale Fayalite, α‐Fe2SiO4

Contact Info

Product

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A laboratory-based investigation into the catalytic reduction of NO_xin iron ore sintering with flue gas recirculation

Facile Large‐Scale Synthesis of Nanoscale Fayalite, α‐Fe₂SiO₄