Characteristics of Prepared Coke–biochar Composite and Its Influence on Reduction of NO&lt;i&gt;&lt;sub&gt;x&lt;/sub&gt;&lt;/i&gt; Emission in Iron Ore Sintering

Fan, Xiaohui; Ji, Zhiyun; Gan, Min; Chen, Xuling; Liang, Yin; Jiang, Tao

doi:10.2355/isijinternational.55.521

Cited by 34 publications

(19 citation statements)

References 15 publications

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“…In general, all sinters in this study were successfully sintered. When pyrolysed biomass was combusted together with coke breeze, different ignition beginnings of both fuels resulted in widening of the flame front, as indicated in [29]. According to Fig.…”

Section: Conditions For the Mineralization Processmentioning

confidence: 97%

Mineral phases in iron ore sinters produced with oak sawdust substitute fuel

Mežibrický

Fröhlichová

2018

J min metall B Metall

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In this paper, the effect of oak sawdust-a cheap substitute fuel on the quality of sinter in terms of its phase composition is evaluated. The samples of sinters prepared with 5, 9, and 13% equivalent fixed carbon substitution of coke breeze by oak sawdust were analyzed by light microscopy, SEM-EDS and powder XRD analysis. The microstructure of sinters in places with fuel residues consisted of well-integrated secondary mineral phases, confirming good conditions for sintering. The phase analysis has shown a predominance of low-Fe SFCA modification over the high-Fe SFCA-I and the increasing trend in the ratio of magnetite with an increasing degree of fuel substitution up to 8%. As a conclusion, the sinters made with a partial replacement of fuel are in terms of the total phase composition comparable to sinter fueled with coke only and therefore qualitatively satisfactory for blast furnace process.

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Section: Conditions For the Mineralization Processmentioning

confidence: 97%

Mineral phases in iron ore sinters produced with oak sawdust substitute fuel

Mežibrický

Fröhlichová

2018

J min metall B Metall

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“…Using higher reactive carbon-bearing materials compared to coke results in decreasing the maximum temperature and shorten the time of holding at high temperature [50,62]. Utilization of biomaterials has been reported to produce a sinter with lower bulk density compared to sinter made with coke which is attributed to the narrower combustion and sintering zones due to the increased flame front speed [63].…”

Section: Sinteringmentioning

confidence: 99%

“…It can partially substitute coke by top charging of lump charcoal or through biomass containing iron composite agglomerates. A more promising route to introduce biomass in BF could be the replacement of coal injected through the tuyeres [16,[49][50][51].…”

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confidence: 99%

New Trends in the Application of Carbon-Bearing Materials in Blast Furnace Iron-Making

Ahmed

2018

Minerals

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The iron and steel industry is still dependent on fossil coking coal. About 70% of the total steel production relies directly on fossil coal and coke inputs. Therefore, steel production contributes by ~7% of the global CO2 emission. The reduction of CO2 emission has been given highest priority by the iron- and steel-making sector due to the commitment of governments to mitigate CO2 emission according to Kyoto protocol. Utilization of auxiliary carbonaceous materials in the blast furnace and other iron-making technologies is one of the most efficient options to reduce the coke consumption and, consequently, the CO2 emission. The present review gives an insight of the trends in the applications of auxiliary carbon-bearing material in iron-making processes. Partial substitution of top charged coke by nut coke, lump charcoal, or carbon composite agglomerates were found to not only decrease the dependency on virgin fossil carbon, but also improve the blast furnace performance and increase the productivity. Partial or complete substitution of pulverized coal by waste plastics or renewable carbon-bearing materials like waste plastics or biomass help in mitigating the CO2 emission due to its high H2 content compared to fossil carbon. Injecting such reactive materials results in improved combustion and reduced coke consumption. Moreover, utilization of integrated steel plant fines and gases becomes necessary to achieve profitability to steel mill operation from both economic and environmental aspects. Recycling of such results in recovering the valuable components and thereby decrease the energy consumption and the need of landfills at the steel plants as well as reduce the consumption of virgin materials and reduce CO2 emission. On the other hand, developed technologies for iron-making rather than blast furnace opens a window and provide a good opportunity to utilize auxiliary carbon-bearing materials that are difficult to utilize in conventional blast furnace iron-making.

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“…8,9) The raw materials were blended according to their proportions in Table 1, with water added to meet the prescribed moisture content. The mixture was then charged into an electrically powered drum of length 1 400 mm and diameter 600 mm for granulation, which was conducted at 15 rev min − 1 for 4 min.…”

Section: Sinter Pot Testmentioning

confidence: 99%

“…5,7) Unfortunately, no research regarding regulating the characteristics of biomass fuels via developing proper preparation technologies were found with the exception of our previous research. 8,9) According to our research, controlling the carbonization process was able to bridge the differences between biomass fuels and fossil fuel, while only afforded less information about the effect of preformation process, which also played a significant role in biochar preparation. Biomass from plants is a cellular material of high porosity, 10) preformation is able to reduce the volume and improve the energy density of biomass fuel through briquetting the raw biomass into regular particles with the help of mechanical pressure.…”

Section: Introductionmentioning

confidence: 99%

Influence of Preformation Process on Combustibility of Biochar and its Application in Iron Ore Sintering

Fan

Gan

et al. 2015

ISIJ International

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A study was carried out into the use of preformation process to prepare biochar for replacing coke breeze in iron ore sintering. Two types of preformation process, thermo-compression process (TCP) and normal temperature process (NTP), were adopted. Results show that preformation contributed to improving the density of both raw biomass and biochar. Recommended preformation parameters for TCP were 200°C, 1 min and 120 MPa respectively, while the recommended preformation pressure for NTP was 180 MPa. Compared with non-preformed biochar, the specific surface area and porosity of preformed biochar were considerably reduced. The inner structure of biochar was therefore compacted to close to that of coke breeze. These changes bridged the differences in terms of combustion properties between biochar and coke breeze. Laboratory-scale sintering tests showed that the proper replacement percentage of biochar to coke breeze was increased from 20% to 40% after preformation process, and the emission reduction of SOx and NOx were correspondingly increased from 18.37% and 15.88% to about 38.00% and 27.00% respectively.

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Characteristics of Prepared Coke–biochar Composite and Its Influence on Reduction of NO<i><sub>x</sub></i> Emission in Iron Ore Sintering

Cited by 34 publications

References 15 publications

Mineral phases in iron ore sinters produced with oak sawdust substitute fuel

Mineral phases in iron ore sinters produced with oak sawdust substitute fuel

New Trends in the Application of Carbon-Bearing Materials in Blast Furnace Iron-Making

Influence of Preformation Process on Combustibility of Biochar and its Application in Iron Ore Sintering

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