During the processing and production of black silicon carbide powder, there will be mineral precipitation. Affected by many factors such as furnace temperature, there may be sticky slag. The specific content can be seen through the following knowledge:

 

It can be seen from the relationship between the viscosity and temperature drop of the tested slag that the viscosity increases with the decrease of the temperature. When the temperature drops to the critical point, the viscosity of the black silicon carbide powder changes obviously. At this point, the slag loses its fluidity, which is a typical alkaline slag short slag or unstable slag. In the high temperature region, the viscosity only increases slightly when the temperature decreases, but the viscosity suddenly increases when it drops to a certain temperature The temperature range of solidification process is narrow. The results show that the alkaline slag has strong crystallinity, and there are still a lot of crystals precipitated when it is close to the liquidus temperature, and the slag becomes heterogeneous, which makes the viscosity increase rapidly and the slag hanging phenomenon increases.

 

Different refining methods lead to different compositions of ladle slag. In this multicomponent slag body, the mineral phases formed by solidification are the same. These minerals have high melting point and are easy to crystallize and solidify. In the liquid slag pool, local or large area temperature drop and other factors change. When it reaches the critical point of crystallization of mineral phase, it will crystallize and solidify instantaneously. After pouring, the ladle temperature drop reaches the maximum, and the slag sticking process is the fastest. The longer the temperature drop time is, the more high melting point mineral phases are generated, and the higher the probability of slag sticking.