ORALS

SESSION: IronTuePM1-R2	Assis International Symposium (9th Intl. Symp. on Advanced Sustainable Iron & Steel Making)
Tue. 28 Nov. 2023 / Room: Dreams 2
Session Chairs: Tateo Usui; Giulio Antunes De Medeiros; Session Monitor: TBA

15:20: [IronTuePM108] OS
REDUCTION RATE ENHANCEMENT OF CARBON COMPOSITE IRON OXIDE PELLETS BY USING SEMI-CHAR OR SEMI-CHARCOAL
Tateo Usui¹ ; Hirokazu Konishi² ; Kazuhira Ichikawa³ ; Hideki Ono⁴ ; Hirotoshi Kawabata² ; Paulo Assis⁵ ; ¹Osaka University, Ibaraki, Japan; ²Osaka University, Suita, Japan; ³JFE Steel Corporation, Fukuyama, Japan; ⁴University of Toyama, Toyama, Japan; ⁵UFOP, Ouro Preto, Ouro Preto, Brazil;
Paper Id: 424 [Abstract]

The exhaustion of natural resources (quantity and quality) and CO2 emission controls are becoming increasingly important in steel industry.  A lot of steel engineers studied various means to decrease reducing agent at blast furnace for reduction of CO2 emissions.  For example, injection of waste plastics and carbon neutral materials such as biomass into blast furnace is better alternative. Especially, biomass has novel advantage, namely, no CO2 emissions, because of carbon neutral. Production of carbon composite iron ore agglomerates having good reducibility and strength is becoming one of the most important subjects.      Carbon composite iron oxide pellets using semi-char or semi-charcoal were proposed in order to enhance the reduction rate of iron oxide.  The carbonization was done under a rising temperature condition until arriving at a maximum carbonization temperature Tc,max to release some part of the volatile matter included (V.M.).  Starting point of reduction of carbon composite pellet using semi-charcoal produced at Tc,max = 823 K under the rising reduction-temperature condition was observed at the reduction temperature TR = 833 K, only a little higher than Tc,max (823 K), which was the aimed phenomena.  As Tc,max increases, the emitted carbonization gas volume increases, while the residual V.M. decreases, and, as a whole, the total heat value of the carbonization gas emitted tends to increase monotonically.

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