Influence of Iron Ore Addition on Metallurgical Reaction Behavior of Iron Coke Hot Briquette

Wang, Hong-Tao; Chu, Mansheng; Zhao, Wei; Liu, Zhenggen; Tang, Jue

doi:10.1007/s11663-018-1481-7

Cited by 24 publications

(26 citation statements)

References 42 publications

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“…The catalytic mechanism is that metal iron in the iron–carbon interface is oxidized to iron oxide by CO 2 at a certain temperature, which is immediately reduced by the surrounding carbon to form metal iron and CO, and the generated metal iron is combined with the surrounding CO 2 again. This process circulates and continuously promotes the carbon gasification reaction . It can be seen from Figure that the reactivity of ICA without adding CTP is already very high due to the catalytic effect of metallic iron.…”

Section: Resultsmentioning

confidence: 97%

“…In consequence, both the compressive strength and the drum strength of ICA achieve higher values with the addition of 7% CTP. Many reactions occurred during the carbonization process of briquettes, including the thermal decomposition, volatilization of volatile matter, shrinkage of semi‐coke, reduction of iron oxide, pyrolysis of binder, which will have significant impacts on the mechanical strength of ICA. Since the types and proportions of iron ore and coals are fixed, the addition ratio of CTP is the main influencing factor on the strength of ICA in this study.…”

Section: Resultsmentioning

confidence: 99%

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Influences of Coal Tar Pitch on Metallurgical Properties of Iron Carbon Agglomerates

Bao

Chu

Han

et al. 2019

steel research int.

Self Cite

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Utilization of iron carbon agglomerates (ICA) with high reactivity in blast furnace (BF) can reduce fuel ratio and carbon emission by decreasing the temperature of thermal reserve zone, which is considered to be an innovative technology for achieving low-carbon ironmaking. Herein, the influences of coal tar pitch (CTP) as binder on the metallurgical properties of ICA are investigated. The results show that the compressive strength of ICA is first enhanced from 1639 to 3168 N and then reduced to 2243 N with the ratio of CTP increasing from 0% to 11%. Meanwhile, the drum strength (I 600 10 ) of ICA is accelerated from 67.3% to 80.5% and then leveled off. In addition, the reactivity of ICA is mitigated from 65.6% to 58.1% first and then increased to 68.8%, while the post-reaction strength shows an inverse trend. When the ratio of CTP is 5-7%, the mechanical strength, reactivity, and post-reaction of ICA are all at a relatively better levels. For the ICA with adding CTP, the mechanical strength is dependent on the microstructure, pore volume, and specific surface area, whereas the variation of reactivity and post-reaction strength are relevant to the pore structure and carbon crystallites structure.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Influences of Coal Tar Pitch on Metallurgical Properties of Iron Carbon Agglomerates

Bao

Chu

Han

et al. 2019

steel research int.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Numerous institutions have focused on how to reduce energy consumption and the environmental pollution of blast furnaces. Many studies from around the world have identified that some commercially available energy-efficiency technologies such as pulverized coal injection (PCI) [3], iron coke hot briquette (ICHB) [4], and top gas recycle (TGR) [5] for BF has reduced the CO 2 emission, but the serious resource shortage and crisis environmental problems still cannot be solved [6,7]. The main reason is that the blast furnace method must use high-grade ore and metallurgical coke, while the sintering and coking process will cause a lot of pollution.…”

Section: Introductionmentioning

confidence: 99%

Influence of Parameters on the Pre-Reduction Process of Vanadium-Titanium Magnetite Carbon-Containing Composite Pellets in Rotary Kiln

Wang

Ding

et al. 2020

Metals

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A novel smelting reduction process called pre-reduction in rotary kiln and total oxygen melting pool is a promising route to reduce environmental pollution from the ironmaking industry. In this paper, the process parameters and appropriate efficiency of reduction in the pre-reduction process of the rotary kiln were investigated via the detection of the metallization rate, phase composition, and internal morphology of the product combining with the analysis of the off-gas. The results indicated that the parameters of reduction temperature, reduction holding time, and coal ratio have a remarkable influence on the metallization rate. The reduction temperature has the most significant effect, followed by the reduction time and the coal ratio. Furthermore, under the condition of reduction temperature 1000 °C, holding time 30 min, coal ratio = 1, a product with a metallization rate of more than 70% can be obtained, which meets the requirements of the rotary kiln process, and its CO2/CO value of the pre-reduction endpoint is appropriate. Continue to increase the temperature, holding time, and coal ratio can raise the metallization rate of the pellets, but only a little improvement and may cause reoxidation of the product.

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“…[18] Blast furnace ironmaking accounts for over 70% of the energy consumption and about 80% of the CO 2 emission of the whole steel production process. [19] Therefore, blast furnace ironmaking is the key to energy saving and emission reduction in the iron and steel industry.To reduce the CO 2 emissions of the iron and steel industry, some low-carbon blast furnace technologies have been put forward or applied in practice. [20][21][22] Under these circumstances, some studies show that applying composite iron coke to blast furnaces could make the thermal reserve temperature drop, strengthen reduction in furnace, improve smelting efficiency, decrease coke ratio, and finally reduce CO 2 emission.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

A New Type of Composite Coke Prepared from Steel Slag and Mixed Coal: Preparation Process and Microstructure

Liu

Cao

Chu

et al. 2021

steel research int.

Self Cite

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Steel slag is a dense and rock-like byproduct of the steel production process. In China, more than 100 million tons of steel slag is produced each year. [1,2] However, only about 30% of the steel slag is utilized availably. [3,4] The main chemical components of steel slag are calcium oxide (CaO), ferrous oxide (FeO), magnesium oxide (MgO), and silicon dioxide (SiO 2 ). Currently, steel slag is widely used in various fields, such as coarse aggregates in roads and pavements and hydraulic engineering, fine aggregates in concrete, and supplementary cementation materials in blended cement. [5][6][7][8] In contrast, global warming has aroused continuous and widespread concern. CO 2 is the main greenhouse gas resulting in global warming, which is harmful to the balance of the natural ecosystem. [9] In 2019, the CO 2 emissions of China, the United States, Europe, and India were 9809.2, 4766.4, 3995.2, and 2309.1 Mt, respectively. [10] The total CO 2 emission of China accounts for more than 28% of the global total CO 2 output, far higher than other countries. [11] Moreover, China's iron and steel industry emits about 16.02% of the CO 2 produced by the global steel industry, which is one of the largest CO 2 emitters of industry. [12][13][14] Thus, how to effectively reduce CO 2 emission for the iron and steel industry has attracted significant interest. [15][16][17] Effective measures should be made to decrease CO 2 emissions for the iron and steel industry. The long process of blast furnacebasic oxygen furnace is the main process of the Chinese steel industry, accounting for more than 90% of China's crude steel production. [18] Blast furnace ironmaking accounts for over 70% of the energy consumption and about 80% of the CO 2 emission of the whole steel production process. [19] Therefore, blast furnace ironmaking is the key to energy saving and emission reduction in the iron and steel industry.To reduce the CO 2 emissions of the iron and steel industry, some low-carbon blast furnace technologies have been put forward or applied in practice. [20][21][22] Under these circumstances, some studies show that applying composite iron coke to blast furnaces could make the thermal reserve temperature drop, strengthen reduction in furnace, improve smelting efficiency, decrease coke ratio, and finally reduce CO 2 emission. [23][24][25][26] With using composite iron coke instead of 30% coke

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Influence of Iron Ore Addition on Metallurgical Reaction Behavior of Iron Coke Hot Briquette

Cited by 24 publications

References 42 publications

Influences of Coal Tar Pitch on Metallurgical Properties of Iron Carbon Agglomerates

Influences of Coal Tar Pitch on Metallurgical Properties of Iron Carbon Agglomerates

Influence of Parameters on the Pre-Reduction Process of Vanadium-Titanium Magnetite Carbon-Containing Composite Pellets in Rotary Kiln

A New Type of Composite Coke Prepared from Steel Slag and Mixed Coal: Preparation Process and Microstructure

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