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针对CAS精炼过程中罩外有大量气泡溢出的问题,在相似性原理的基础上建立了CAS钢包的水模型.研究了CAS精炼过程中底吹气量、浸渍罩插入深度和不同底吹位置对钢包混匀时间的影响.实验发现:浸渍罩的中心与底吹气孔的中心同轴时,能有效地防止罩外气泡溢出.对于300 t钢包,底吹方案优化后,底吹位置选在距钢包中心0.3r～0.4r(r为钢包底部半径),精炼时底吹气量为600 L·min-1,排渣时底吹气量选在500 L·min-1左右,浸渍罩浸入深度选为180～225 mm.工业试验表明,优化后的底吹方案有效地解决了罩外气泡溢出的问题,并且提高了LCAK钢液的洁净度和可浇注性.
A CAS model ladle water model was established on the basis of the principle of similarity to deal with the problem of a large number of bubbles overflowing outside the enclosure during the CAS refining process.The effects of the bottom blowing volume, immersion depth and different bottom blowing positions on the ladle Mixing time.The experiment found that when the center of the impregnated cover is coaxial with the center of the bottom blowing hole, it can effectively prevent the bubbles from overflowing outside the cover.After 300t ladle and bottom blowing program is optimized, the bottom blowing position is selected from the ladle The center 0.3r ~ 0.4r (r for the ladle bottom radius), refining the end of the blow volume of 600 L · min-1, the bottom blow when blowing the amount of selected in the 500 L · min-1 or so, immersion cover immersion depth selected as 180 ~ 225 mm.Industrial tests show that the optimized bottom blowing solution effectively solves the problem of bubble overflow outside the cover and improves the cleanliness and pourability of the LCAK liquid steel.