珪酸塩スラグ中酸化クロムの固体炭素による還元速度
1986 年 50 巻 9 号 p. 811-817
詳細
1986 年 50 巻 9 号 p. 811-817
The rate of CrO reduction from silicate slag containing low concentrations of CrO, melted in a graphite crucible has been investigated by thermogravimetry under argon atmosphere.
The first-order-type rate equation was found to be applicable to the CrO reduction. The rate is markedly affected by the wettability of the slag to the graphite crucible. In case of the immersional wetting, the rate constant varied from 3.5×10−3 to 3.6×10−2 kg/m2·s at 1873 K, whereas in the adhesional wetting, it was 1 to 2 orders of magnitude lower than in the former case. The reduction of CrO depended strongly on the phases present in the CaO-SiO2-Cr2O3 system. The reduction from the slag with two liquids phase proceeded significantly faster than that from the slag with other phases. The apparent activation energy for CrO reduction was about 300 kJ/mol.
It is considered that the reduction rate of CrO would be under a mixed controle of the interfacial reaction and the mass transfer in the slag.
