TItle：How to control the moisture of the mold powder?
Description： Moisture of mold flux is divided into two types: adsorption water and crystal water. Moisture can agglomerate mold powder and deteriorate its quality. Therefore, the moisture content should be limited to less than 0.5%. This article briefly explains how to control moisture.
Moisture of mold flux is divided into two types: adsorption water and crystal water. Moisture can agglomerate mold powder and deteriorate its quality. The moisture content should be limited to less than 0.5%.
Certain substances in the base material, such as soda, solid, and water glass, have a strong ability to absorb water. When the water is absorbed, the powder slag is wrapped into a mass, which brings trouble to the continuous casting operation.
The water absorption of the mold powder is mainly determined by the type and particle size of the raw materials. The finer the particle size, the greater the water absorption. At 200 mesh, the water absorption of cement is 0.41%, solid water glass is 3.24%, fluorite is 0.45%, soda is 15.9%, and graphite is trace amount.
Method of controlling moisture: the baking temperature of raw materials is not lower than 110℃. Properly extend the baking time. The raw materials after baking should be mixed and mixed in time, and the prepared slag powder should be sealed and sealed in time.
For steel grades with higher quality requirements, it is best to bake the mold powder raw material to a temperature above 800°C to remove the crystal water, or use a pre-melted mold powder.