Castable is a kind of granular and powdery material made of refractory material, 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 of aluminum dihydrogen phosphate should be controlled at 13% ~ 15%. However, the liquid aluminum dihydrogen phosphate reacts with the metal iron in the refractory to generate hydrogen at room temperature, which makes the casting lining expand and form porous porous porous body. That is because the cement contains a certain amount of metal iron. Therefore, it is necessary to add anti bulging inhibitor (concealing agent) or add liquid potassium dihydrogen phosphate twice when castable is mixed. The specific method is to add 6% ~ 7% potassium dihydrogen phosphate into the castable mixture at one time and keep it in semi wet state for 24h. Before adding potassium dihydrogen phosphate for the second time, add 2 ~ 3% coagulant, mix the materials evenly, and then add the remaining 6 ~ 7% potassium dihydrogen phosphate solution, and then mix evenly before pouring. Generally, it can prevent expansion.
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