コークス内装クロム鉱石ペレットの加熱過程における還元挙動
1989 年 75 巻 10 号 p. 1869-1876
詳細
1989 年 75 巻 10 号 p. 1869-1876
To clarify the reduction process of chromium ore the pellet of chromium ore fines mixed with coke powder was heated in a coke powder bed at various reaction temperatures, such as 1200, 1300, 1400 and 1 500°C.
The metalized fractions of Fe and Cr were evaluated by chemical analyses, and the variations of microstructure and composition of pellet in the reduction process were measured by using microscope, X-ray diffraction and EPMA. The following results were obtained.
The reduction curves of the pellets showed that the reduction rate of iron oxides and chromium oxides depends mainly on temperature. EPMA analysis showed that the firstly reduced Fe diffuses from the inside of ore particle to both its surface and the crack in it and then condenses with redution, and the lately reduced Cr diffuses into the Fe grains and is intergrated mutually.
