Castable is a kind of granular and powdery material made of refractory, which is composed of a certain amount of binder and water. Today I will explain to you how to solve the expansion of refractory castable.
The addition amount of aluminum dihydrogen phosphate should be controlled at 13% ~ 15%, but the liquid aluminum dihydrogen phosphate will react with the metal iron in the refractory to generate hydrogen at room temperature, which will expand the poured lining and form a porous loose body. Then it is because the cement contains a certain amount of metal iron. Therefore, anti bulging inhibitor (Concealer) must be added, or liquid potassium dihydrogen phosphate must be added twice when the castable is mixed. The specific method is to add 6% ~ 7% potassium dihydrogen phosphate to the castable mixture at one time and store it in a semi wet state for 24 hours. Before the secondary addition of potassium dihydrogen phosphate, add 2 ~ 3% coagulant, mix the materials evenly, then add the remaining 6 ~ 7% potassium dihydrogen phosphate solution, mix evenly and pour. Generally, it can prevent expansion.
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