Suppression of infrasonic noise emanating from the NAL 1 m x 1 m supersonic wind tunnel

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.…”

Effect of Adding Moisture and Wettability on Granulation of Iron Ore

“…Although the measuring method was different from this study, it was reported that the contact angle between hematite ore and water was about 60-75°in previous studies. 1,4) Therefore, the values of the contact angle at 0 min of retention time obtained in this study seem to be not so different from the previous ones even taking into account of the differences of measuring methods, brand of iron ores and surface property. Moreover, except for ore B, it was found that the contact angle increased with increasing the surface roughness as a general tendency.…”

Effects of Briquette Blend on Packing Structure of Fine Coal Portion

“…One such coal pre-treatment method aimed at improving the bulk density of the coal charge is the briquette blending method, 4) in which a portion of the powder coal is briquetted and then the briquettes are charged into the coke oven together with the rest of the powder coal. As a briquette has higher apparent density than the powder coal, briquette blending increases the overall bulk density of the coal charge, thereby improving the coke strength.…”