1N-NaOH 수용액에 미세한 침상형 α-Goethite(평균길이 0.27㎛)가 현탁된 기포탑에서 물질전달 현상에 대하여 연구하였다. 기포경을 측정하기 위하여 2-point probe를 사용하였다. 측정된 기포경은 log-normal분포를 나타냈으며 공탑속도와 현탁농도의 증가에 따라 기포경의 분포는 unimodal 에서 multimodal로 변화되었다. 계산된 Sauter 평균 기포경(dvs,volume-to-surface mean bubble diameter)은 공탑속도와 현탁농도의 증가에 따라 최소치를 보인후 증가하는 경향을 보였다. 물질전달계수(kL)는 0.9wt% 미만에서 증가현상을 보였으며 0.9wt%이상일 경우 고체농도의 증가에 따라 급격히 감소하였고, 또한 Sauter 평균 기포경(dvs)이 커짐에 따라 증가현상을 보였다. 본 현탁기포탑에서의 물질전달계수는 아래와 같이 무차원군과 고체농도비(wt%)의 항으로 잘 나타낼 수 있었다. Sh=1.0×10-5Sc1.53Re0.79Bo0.51/(1+8.×Φ2..73)
Mass transfer phenomena were studied in a slurry bubble column in which fine acicular α-Goe-thite partiicles(average length 0.27㎛) were suspended in 1N-NaOH solution. In order to measure bubble diameter, two-point probe was used. Distribution of measured bubble diameters in the slurry bubble column was showed log-normal and changed from unimodal to multimodal with increasing the superfiicial gas velocity and solid concentration. Sauter mean bubble diameter(dvs, volume-to-surface mean bubble diameter)was minimized at transition region, but above that region, it was increased by increasing superficial gas velocity and solid concentrations. Liquid side mass transfer coefficient(kL) was increased below 0.9wt% solid concen-tration but was suddenly decreased above 0.9wt% by concentrationg the solid. The kL was also increased with increasing the Sauter mean bubble diameter. Liquid side mass transfer confficient can be represented as following equation by dimensionless groups and wt% concentration on this system and conditions. Sh=1.0×10-5Sc1.53Re0.79Bo0.51/(1+8.×Φ2.73)