Analysis of foaming index of refining slag. The foaming property of refining slag is related to viscosity, apparent tension and density of slag, which is generally measured by foaming index. However, the determination of slag foaming index is based on the experimental data such as a certain slag composition range, a certain temperature and a certain blowing speed. In actual production, these factors are constantly changing with the change of refining requirements and production process, and the specific process of each production unit is different. Therefore, the conclusion has certain limitations on the guiding significance of actual production Sex. The effect of fluorite on the foaming effect is very obvious, one is to reduce the surface tension and slag density, which is conducive to slag foaming; the other is to reduce the slag viscosity, which is not conducive to slag foaming. Therefore, according to the slag system used in actual production, it is necessary to reasonably control the adding time and dosage.

The foaming of refining slag not only depends on the properties of slag, but also depends on the volume of gas. Even if the slag is of good quality, the effect of foaming slag is not good because of the small amount of gas. In the middle and later stage of refining, the effect of adding calcium carbide or silicon carbide to the foaming slag is poor because the oxygen in the slag has been nearly removed. In order to improve the foaming performance of the slag in the middle and later stage of the refining, the foaming agent added with limestone and a small amount of carbon powder can be used to promote the foaming of the slag by using the CO bubbles formed by the reaction of CO2 and C.