What is the difference between wet refractory spray and dry refractory spray?

There are two ways to spray paint: dry and wet. At present, wet spray is the most commonly used technology. Wet mist requires a dedicated sprayer, and the rebound rate of spray is about 10%. Dry spray generates a large amount of dust during construction, which has a negative impact on the working environment.

Whether it is dry spray or wet spray, spraying can achieve a spray coating with a certain strength, and the convenience and speed of spraying are fully reflected, especially for blast furnace lining and hot blast furnace lining.

Before the construction of the wet method, the material is thoroughly mixed in a mixer and then sprayed. This ensures good working environment conditions during spray painting and eliminates the risk of dust generation. The national standard rebound loss is 20%, but the adhesion rate of the sprayed material is also high. Due to the continuous improvement of the spraying process, the rebound rate currently used in the market is about 8-10%.

The raw materials used are very different between dry spraying and wet spraying. The main raw material for wet grinding is high aluminum material, and the main raw material for dry grinding is coke. Due to the high aluminum content, the durability is very high, and the resistance of wet spraying is higher than that of dry spraying.

The biggest difference between dry spraying and wet spraying is as follows:

1. The volume density of wet spraying after heat treatment is higher than that of dry spraying, and the compressive strength is also higher than that of dry spraying. Because the moisture content of wet spraying is higher than that of dry spraying, the linear shrinkage rate of wet spraying after heat treatment is higher than that of dry spraying.

2. The higher the alumina cement content in the spraying material, the higher the bending strength and compressive strength. The binding rate of the wet material is higher than that of dry spraying, and the bending strength and toughness are also higher than that of dry materials.

3. Dry spraying raw materials contain a certain percentage of kyanite. Wet spraying materials are mainly composed of bauxite. Kyanite can withstand the expansion of the dry spray volume after high temperature decomposition. High density alumina has a high density and has a higher strength in use than dry materials.