Production Conditions of Carbon Iron Composite

In these years, the development of innovative energy saving technologies for climate change is strongly desired, and radical low reducing agent ratio (RAR) operation in the blast furnace is required. As a means of realizing low RAR operation, the development of an innovative raw material "Carbon Iron Composite (CIC)" for satisfying both high coke reactivity and iron ore reduction is thought to be useful, focusing on the temperature of the thermal reserve zone. Carbon Iron Composite is produced by mixing coal and iron ore and briquetting, followed by carbonization of the briquetted materials. In this study, the effect of the blending ratio of coal and iron ore on CIC properties was investigated. The blending ratio of iron ore was set to be in the range from 0 to 50%. The roll cup shape was an egg type, and the roll cup volume was 6 cm(3). Briquettes were carbonized in a bed of coke breeze using an electric furnace for 6 h at a furnace wall temperature of 1000 degrees C. The value of I-type drum index of CIC stayed constant at the blending ratio of iron ore up to 30%. However, severe decrease was observed at 50%. Measurements of CO(2) reactivity of briquettes at 900 degrees C revealed that the reaction rate was raised with increase of the blending ratio of iron ore. Carbon Iron Composite having both high strength and reactivity was successfully produced at the blending ratio of iron ore of 30%.