To prevent molten steel from sticking to the inner wall of the mold during condensation, reduce friction resistance during billet drawing, improve the surface quality of the billet, and extend the service life of the mold, lubrication of the inner wall of the mold is also necessary in production. Lubrication is the use of liquid lubricants or protective slag with a boiling point higher than the temperature of the inner wall of the mold (about 200 ℃). During the vibration process of the mold, they are continuously brought into the inner wall below the steel liquid level and form an oil gas film or slag film between the steel or billet shell and the inner wall of the mold to lubricate the inner wall.

Crystallizer is a groove shaped container with a jacket on the wall or a snake tube inside, used to heat or cool the solution in the tank. The crystallization tank can be used as an evaporation crystallizer or a cooling crystallizer. To improve the production intensity of crystals, an agitator can be added in the tank. Crystallization tanks can be used for continuous or intermittent operations. The crystals obtained through intermittent operation are relatively large, but they are prone to forming clusters and entraining the mother liquor, which affects the purity of the product. This crystallizer has a simple structure and low production intensity, making it suitable for the production of small batch products such as chemical reagents and biochemical reagents.