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

Fan, Xiaohui; Ji, Zhiyun; Gan, Min; Chen, Xuling; Li, Qiang; Jiang, Tao

doi:10.2355/isijinternational.isijint-2015-332

Cited by 22 publications

(7 citation statements)

References 17 publications

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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%

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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Section: Sinteringmentioning

confidence: 99%

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

Ahmed

2018

Minerals

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“…Around 9-12% of the energy consumed in an integrated steelwork is consumed in the sintering process, and 75-80% of this energy is produced by using contaminant solid fuels, such as coke breeze, anthracite, etc. [68]. These fossil fuels generate diverse pollutants, mainly CO 2 ,S O X and NO X , and have made researchers to focus on studying more ecological alternatives as biochar, straw, or charcoal [65].…”

Section: Iron Ores and Iron Oxide Materialsmentioning

confidence: 99%

Iron Ore Agglomeration Technologies

González¹,

Piñuela-Noval²,

González³

2018

Iron Ores and Iron Oxide Materials

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Until the 1950s of the last century, the oxidized iron ores that were loaded into the blast furnace had granulometries within 10 and 120 mm. However, the depletion of highgrade iron ore sources has made necessary the utilization of concentration processes with the purpose of enriching the iron ore. Because of these processes, a fine granulometry is produced, and thus iron agglomeration process is necessary. There are several agglomeration processes including: briquetting, extrusion, nodulization, pelletizing and sintering, although pelletizing and sintering are the most widely used, and especially sintering process (70% blast furnace load). Apart from obtaining an agglomerated product, the objective is reaching the suitable characteristics (thermal, mechanical, physical, and chemical) in a product that is then fed into the blast furnace, achieving a homogenous and stable operation in this furnace with economical profitability.

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“…7 Noncarbonized biomass fuels have been shown to reduce sintering quality and may even generate some unexpected flue gas pollutants, 8 the acceptable replacement ratio of which is quite low. 9 Fan et al 4,10,11 used several straw-based fuels with different preparation methods to carry out sintering pot tests, showing various degrees of deterioration in sintering quality. The authors believe that the main reason is the high volatile content and low combustion efficiency of biomass fuel.…”

Section: Introductionmentioning

confidence: 99%

Effect of raw material composition on combustion behavior of quasi‐particles in the iron ore sintering process

Meng

Wang

Xue

et al. 2023

Asia-Pacific J Chem Eng

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As the basic unit of iron ore sintering bed, the combustion behavior of quasi‐particles significantly impacts the sintering process. Adding biomass char leads to the deterioration of sintering quality, which was originally for the reduction of carbon emission. In this study, the isothermal thermogravimetric platform was used to analyze the combustion behavior of quasi‐particles using different fuels and ores. The results show that the mass of quasi‐particles packed bed decreases rapidly with combustion, then rises slowly, and then tends to be stable. The quasi‐particle samples in the combustion process were quenched with liquid nitrogen, and the composition changes in the quasi‐particle combustion process were analyzed. The results show that the excessive mass loss is caused by the reduction of iron ore in the sintering atmosphere, which also means heat loss. Compared with the samples using coke, when the fuel is exhausted, the proportion of calcium ferrite in the samples using charcoal decreases by 10.94%, while the proportion of magnetite and FeO is 11.36% and 1.04% higher, respectively, which will further lead to the formation of calcium iron olivine and reduce the sinter strength. The addition of magnetic concentrate may help to reduce the heat loss caused by the reduction reactions, but it is necessary to optimize the sintering process.

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

Cited by 22 publications

References 17 publications

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

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

Iron Ore Agglomeration Technologies

Effect of raw material composition on combustion behavior of quasi‐particles in the iron ore sintering process

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