クロム鉱石の溶融還元速度に及ぼす攪拌の影響

抄録

For the examination of stirring effect in the in-bath smelting reduction process, influence of stirring on the reduction rate of chrome ore was studied. The experiments were mainly carried out using a ten-ton test converter with oxygen top-blowing, nitrogen side-blowing and nitrogen bottom-blowing. After five tons of chrome ore were fed with coke and lime on five tons of molten iron, the stirring effect was examined by changing the gas blowing conditions.
Main conclusions are as follows:
(1) The change in the reduction rate caused by the change in the blowing conditions corresponds with the change in the stirring power for the slag layer.
(2) The nitrogen side-blowing has nearly the same effect on the slag stirring as the nitrogen bottom-blowing has, when the blowing rate is the same.
(3) The nitrogen side-blowing is suitable for the intensive stirring of slag, which contributes to enhancing the reduction rate of chrome ore.