Temperature Control of Molten Brick Casting

The casting process of the fused brick, especially for the multi-component fused zirconia corundum brick casting process is very complicated, because each component has its own melting point and crystallization temperature, they differ from each other Baidu sometimes up to thousands of degrees The It is not possible to manufacture refractories with a melting point of 2600K from an electric arc furnace.

It is well known that the body must be heated before the meltblown melt is discharged. For example, for steel. The temperature before pouring is 100 degrees higher than the melting point in order to completely fill the model, resulting in accurate geometric dimensions of the castings. For fused zirconia corundum, the temperature is 200 degrees higher. In the melting and pouring multi-component ingredients, the general is by eutectic point or invariant point. At this time, the components can be crystallized at the same time.

 If the temperature of the multi-component fusible brick melt does not rise to the temperature of the most refractory component, the melt may be vented by relying on the low temperature component to overheat. But in this case, the fusible brick will contain non-melting components. Analysis of the selection of ingredients composition shows that the general refractory components in the melting point of the difference is not significant. However, in the ternary system of fused zirconia corundum bricks and chrome spinel, this difference is about 1000 degrees; thus it is difficult to formulate the fused brick casting process, and there is no such difficulty in pouring steel. The difficulty is that for each multicomponent system, the composition and percentage are chosen to determine the eutectic or invariant points, taking into account the melting properties of each component, the study of the crystallization process by which the mixture forms a refractory Characteristics, and therefore need to conduct a special study.