Solutions for refractory castable expansion

In the application process of the refractory castable  often appear a certain degree of expansion coefficients, which will affect the quality of the work castable body. So, to the problem of refractory castable how to solve it? Castable refractory is a material made ​​by the granular and powdered materials, and add a certain amount of binder composition and water together.

Luoyang Elon Refractories technical staff tell everyone how to solve the problem of castable expansion:

1.    You can then add refractory castable aluminum dihydrogen phosphate, aluminum dihydrogen phosphate dosage should be controlled at 13% to 15%, but due to the liquid aluminum dihydrogen phosphate refractory generate hydrogen reacts with metallic iron at room temperature, and after pouring the liner body swell, parallel porous loose body.

2.    Since the cement composition contains a certain amount of metallic iron. Therefore, you must add the anti-bulging inhibitors (covert agent), or mixed castable liquid potassium dihydrogen phosphate was added in two hours. The specific method is first added 6% to 7% potassium dihydrogen phosphate in castable mixture , trapped material in the semi-wet state 24h. Before the second plus potassium dihydrogen phosphate, first add 2 to 3% of coagulant, the material mix well, then add the remaining 6-7% potassium dihydrogen phosphate solution, and then mixed evenly pouring. Expansion can be prevented in general.

3.    Porcelain ball mill grinding, or by using a strong acid (such as hydrochloric acid, etc.) washing powder and magnetic separation methods such as using less metal and other impurities into or excluded.

4.   Reduce the amount of cement, mixing inhibitor or improve molding pressure.