Fundamental research on iron coke hot briquette – A new type burden used in blast furnace

Guo

et al. 2018

Gasification reaction behavior of iron coke as well as kinetic parameters is extremely important for its quality evaluation and practical application in an actual blast furnace. However, there are few researches on the gasification behavior of iron coke, especially for iron coke hot briquette (ICHB) prepared by hot briquetting process. In this paper, the gasification reaction behavior of ICHB is experimentally investigated under isothermal conditions. Meanwhile, the kinetic analysis for the gasification process of ICHB and the related mechanism are carried out. The results demonstrate that the increase of the reaction temperature causes the significant rise of the carbon conversion rate and the reaction rate of ICHB, while the post‐reaction strength is evidently decreased. The size degradation of ICHB after reaction is increasingly serious as the reaction temperature goes up, and more pores as well as cracks are generated inside the gasified ICHB. During the gasification, the reduction of iron oxide, the oxidization of metal iron, and the generation reaction of fayalite are concomitantly occurred. The most probable mechanism function is confirmed. Based on this model, the activation energy and pre‐exponential factor are conducted, which are 144.77 kJ mol−1 and 999.37 min−1, respectively.

Section: Introductionmentioning

confidence: 99%

Investigation on Gasification Reaction Behavior and Kinetic Analysis of Iron Coke Hot Briquette under Isothermal Conditions

Wang

Guo

et al. 2018

“…[12] The other process is that iron ore and coals are agglomerated through briquetting and then carbonized in a shaft furnace. [13][14][15][16][17][18] Nippon Steel Corporation [19] prepared iron coke by coke oven process and carried out production tests in industrial coke oven. Meanwhile, Nomura et al [10] studied the influence of iron coke on the BF ironmaking using blast furnace inner reaction simulator (BIS) furnace.…”

Section: Introductionmentioning

confidence: 99%

Effect of Iron Carbon Agglomerates on Isothermal Reduction of Pellets with Different Reducibility

Bao

Liu

et al. 2021

“…It was shown that the interaction of SOP and ASP can improve the cold strengths of ferro‐coke before and after carbonization. Wang et al have found that the mechanical strength of the iron coke before carbonization can be notably enhanced by hot briquetting the mixture of iron ore and coal without using binder, but the temperature of the mixtures is relatively high. At the same time, the mechanical strength of iron coke after carbonization can be optimized by adjusting the ratio of coal and iron ore.…”

Section: Introductionmentioning

confidence: 99%

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

Bao

Han

et al. 2019

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.