What are the types of equipment for stock preparation?

Stock preparation refers to the pulping activities in the papermaking process. The machines used for pulping activities are mainly divided into two categories. This paper will introduce in detail the types of equipment for stock preparation.

The following is a list of contents:

• Type I dispersion equipment

• Type II dispersion equipment

• Summary

Type I dispersion equipment

During stock preparation, in the process of mechanical dispersion, the shear force is transmitted by solid-phase grinding to act on the particles. This kind of dispersion equipment is mainly represented by the ball mill disperser. During stock preparation, the shear force acting on the particles is inversely proportional to the third power of the particle size, that is, the smaller the particles are, the greater the shear force acting on the particles by the ball mill disperser.

Type II dispersion equipment

The sheer force is transmitted to particles through a fluid medium, which includes a hydrodynamic shear disperser, kneading machine, roller mill, and disc mill. In the quasi process of stock preparation, the shear force is transmitted through the fluid medium to act on the particles. This kind of dispersion equipment includes hydrodynamic shear disperser, kneader, roller mill, and disc mill.

In the process of stock preparation, the shear force acting on particles by the second type of disperser is independent of the size of agglomerated particles. Comparing the energy consumption of different dispersion equipment and the limit particle size, it can be seen that the ball milling dispersion energy consumption is low and the limit particle size is small. During stock preparation, ultrasonic dispersion has high energy consumption and low limit particle size; The energy consumption of fluid shear dispersion is moderate, but the limit particle size is difficult to be lower than 100 nm.

In the stock preparation machinery, kneader, roller mill, and disc mill in the second type of fluid shear dispersion equipment are commonly used for the preparation of slurry with high solid content and high viscosity and are rarely used for the lithium battery pulping process. Therefore, a large number of dispersion equipment used for lithium battery pulping belong to hydrodynamic shear dispersers, such as high-speed shear disperser, twin-screw continuous pulping machine, etc.

Summary

Improving the efficiency and quality of the lithium battery pulping process is an important subject of stock preparation. Mechanical stirring is an important micro process to realize the depolymerization of particle aggregates and uniform dispersion pulping. It is difficult to obtain fine and uniform slurry by a single dispersion method. PD mixer is usually used for pre-mixing and high-strength depolymerization by high-speed disperser in stock preparation, to obtain lithium battery slurry with low viscosity, high solid content, and high stability. At present, the large-scale application of twin-screw continuous pulping machines is less. In the stock preparation machinery, as a continuous and efficient pulping method, it has a small floor area, short pulping time, and great development potential.

The above is the full introduction of the equipment types for stock preparation in this paper. I hope it will be helpful to you.