Effect of Magnesium Sulfate on Properties of Magnesium Castables
At present, magnesium sulfate develops rapidly, is widely used, and covers a wide range of fields, bringing a lot of help and convenience to our life and production. Today I will introduce the effect of magnesium sulfate on the performance of magnesium castables. I hope you can read it carefully.
The binder of magnesia castables is usually silica fine powder, aluminate cement or polyphosphate, silica fine powder and aluminate cement produce liquid phase at high temperature, which is unfavorable for the high temperature performance of the material; the presence of polyphosphate is easy Lead to the problem of increasing phosphorus in molten steel. In order to reduce the adverse effects of the above-mentioned binders, it is very helpful to use magnesium sulfate as the main binder and silica as the auxiliary binder to study the effect of magnesium sulfate on the properties of magnesium castables.
The main raw materials used are fused magnesia and silicon dioxide powder, and magnesium sulfate is 99.5% industrial grade. Using magnesia as aggregate and fine powder. Among them, the aggregate particle size includes 5 ~ 3mm, 3 ~ 1mm and 1 ~ 0mm three-level particle gradation, and the fine powder is ≤0.074mm fine powder. The mass ratio of aggregate to fine powder is 70:30. The sample is cast in a 160mm x 40mm x 40mm triple mold. After 24h of natural curing, the mold is released. Heat treatment under the condition of ℃ x 3h.
In the experiment, the addition amount of silicon dioxide powder was kept unchanged at 3%, and the addition amount of magnesium sulfate was changed: 1%, 2%, 3%, 4%, 5%. The performance of strength, linear change rate and slag resistance can be tested, so that the effect of the addition amount of binder magnesium sulfate on the performance of magnesium castable can be analyzed through the experimental results. The production of magnesium sulfate by the high-temperature salt conversion method of the by-product of the salinization system is the direction of future development. In short, the development of magnesium sulfate has broad prospects.
