- Time:Aug 08, 2023
Refractory castable is a special material for repairing, masonry and coating refractory materials, usually used in high temperature industrial equipment. Water is one of the indispensable ingredients in the preparation of refractory castables, so water quality has an important impact on the performance and service life of refractory castables. The following are general considerations for water quality requirements for refractory castables:
1. Cleanliness: The water should have good cleanliness without suspended particles, sediment, organic matter or other impurities. These impurities may adversely affect the flow, cohesion and durability of the castable.
2. pH value: The pH value of the water should be within an appropriate range, and it is generally recommended to be between 6.5 and 7.5. A pH value that is too high or too low may cause the chemical reaction in the refractory material to intensify or weaken, affecting the hardening and performance of the castable.
3. Water purity: Water purity is also an important factor. Hard water (rich in calcium, magnesium ions, etc.) or water containing other dissolved solids may cause precipitation, scale or cement gel formation, thereby reducing the quality of the castable.
4. Water temperature: The temperature of the water used in the castable should be within the normal temperature range. Water temperatures that are too high or too low may cause changes in solubility and reaction rates, affecting the coagulation and curing of castables.
5. Saturation: Some refractories require saturated water to be prepared. This means that when a certain temperature is reached, the solid matter that water can dissolve has reached the maximum. Saturation control helps ensure stable and consistent castable formulations.
The above are the water quality requirements of refractory castables generally considered, and the specific requirements may vary due to different refractory material formulations, processes and applications. In actual operation, it is recommended to refer to the technical guidelines and product specifications provided by the refractory castable manufacturer to ensure that the proper water quality conditions are used to obtain the best refractory castable performance.
