Mixing time, bubble behavior and absorption rate of gas injected into a liquid bath through rotary L-shaped lances have been studied by cold models with an effort to improve refining characteristics of metallurgical processes. Two kinds of the rotary lances were tested, namely the single-hole lance and the multi-hole lance. The effects of gas flow rate, bath depth and rotation speed were examined. It is found that when gas is injected through the rotary lances, the mixing intensity and the gas absorption rate are larger than that for the gas injection through stationary lances. The effect of rotation speed decreases as the bath depth and the gas flow rate increase. The multi-hole lance produces much smaller bubbles, which lead to an increase in the volumetric mass transfer coefficient by 3 approx. 4 times as compared with the single-hole lance. However, the effect of rotation speed is smaller for the multi-hole lance. The obtained results are explained in terms of the bubble coalescence and fragmentation, the rate of which depends on the departure bubble size and the power supplied to the liquid bath.
|Number of pages||8|
|Publication status||Published - 1996 Jan 1|
|Event||Proceedings of the 1996 International Symposium on Injection in Pyrometallurgy - Melbourne, Aust|
Duration: 1996 Jul 1 → 1996 Jul 3
|Other||Proceedings of the 1996 International Symposium on Injection in Pyrometallurgy|
|Period||96/7/1 → 96/7/3|
ASJC Scopus subject areas