Behavior of slag foaming caused by blowing gas in molten slags

The relationship between the height of foaming slag and blowing gas flow ra te has been investigated at different temperature and with additives such a s coal, coke, graphite and CaO, in order to understand the foaming phenomen on in most metallurgical processes comprehensively. On the basis of experim ental results, the regressed foam behavior equations (Deltah=b.V-m) were ob tained. Those correlation coefficients were in range from 0.995 to 0.999. I t means that the foam behavior equation can be used to describe foaming abi lity of the slag foaming caused by blowing gas quantitatively. The foaming index Sigma is only a limited case for of the foam behavior equation and ca n be used only at high temperature and without additives for the foaming ph enomenon caused by blowing gas. It was found also that the targe carbonaceo us particles could decrease the height of foaming slag, however the fine ca rbonaceous and CaO powder could increase it. The basicity of the slag affec ts the height of foaming slag.