Kinetics of Reducibility of Sinter

Effect of the Reduction of Calcium Ferrite on Disintegration Behavior of Sinter under High Hydrogen Atmosphere

“…On the other hand, CCF undergoes no phase and shape changes after reduction by CO and CO-H 2 gas at 773 K for 5.4 ks. These results correspond to the previous reports 9) that CCF has less reducibility than acicular calcium ferrite -which has a fine structure and many poresbecause CCF exists with a slag phase and has few pores. Figure 5 shows the change with time of the reduction degree of sinter reduced by CO and CO-H 2 gas at 873 K. The reduction degree values, R.D.…”

“…Different aspects of the structures were observed to change during the reductions of ACF-A and ACF-B because the stress to which ACF-A is subjected by the surroundings is larger than that to which ACF-B is subjected, due to the volumetric expansion of skeletal hematite in the sinter following the reduction to magnetite. 9) This behavior may also lead to the destruction of the ACF-A phase. Furthermore, this destruction of ACF-A occurred after ACF-A reduction had progressed.…”

Effect of Granulation Condition and Property of Raw Material on Strength of Granulated Particle by Tumbling Granulation

“…Moreover, the following properties are required for the particles charged into sintering machine; the quasi-particles, granules of coarse iron ore with fines adhered on them, must be hard not to break down when they are charged into feed hopper (drop strength) and inside the feed hopper (compressive strength) and the quasi-particles also keep their shapes during sintering, especially in dry zone (dry strength). In addition, it is well known that the structure and strength of the quasi-particles are influenced greatly by the porosity of iron ore, wettability between iron ore and water, adding moisture and characteristic of surface of iron ore. [1][2][3][4][5][6][7][8][9][10][11][12][13] Therefore, in this study, as the fundamental research for clarifying the factor on strength of quasi-particle granulated by using the limonite iron ore, the effects of porosity, adding moisture and revolution speed of pelletizer on the strength of granulated particle were examined by using reagent hematite. In addition, using three kinds of iron ore, the relationship between granulated particle size and strength was examined.…”

Optimization Studies of Hot Metal Desulphurized and Basic Oxygen Furnace Slags in Sinter Making at JSW Steel Limited

“…Calcium ferrite is the major mineral constituent of the sinter structure and it imparts strength to the sintered mass. High content of calcium ferrites favors the tumbler strength of the sinter [15,16]. From the test results it was found that maximum 2.5 to 3.0 % (30 to 35kg/t of sinter) HMDS Slag can be used in the sinter making to achieve desired properties of the sinter as per the customer requirement .…”