Zirconia beads are basically used in nano materials, such as paint, coating, titanium dioxide industry, lithium battery anode, cathode and diaphragm. Zirconia beads are used in some biological fields, such as tissue grinding. The performance of zirconia beads is very suitable for grinding, so alumina balls and steel balls were used before, Later, some began to grind with zirconia beads.
Zirconia beads are basically used in nano materials, such as paint, coating, titanium dioxide industry, lithium battery anode, cathode and diaphragm. Zirconia beads are also used in some biological fields, such as tissue grinding. The performance of zirconia beads is very suitable for grinding, so alumina balls and steel balls were used before, Later, some began to grind with zirconia beads.
Zirconia ball is mainly used for grinding, and some people use it for polishing and sand blasting. In terms of grinding, zirconia ball has very good toughness, which can realize normal operation in rod pin grinder with high impact. The dispersion disk drives the grinding medium to move at high speed to produce friction and shear, so that the materials can be ground and dispersed. The grinding chamber adopts forced cooling. There are horizontal sand mill and vertical sand mill, such as cylindrical annular sand mill and tower sand mill. Generally wet grinding. The material is mixed and rotated with the grinding body under the action of the rotating grinding disc, and is crushed by grinding and shearing with the grinding body and with each part of the crushing chamber. There are horizontal sand mill and vertical sand mill, such as cylindrical annular sand mill and tower sand mill. Generally wet grinding.
Very low wear rate, long service life and high cost performance. When grinding, the impact force between balls is large, the grinding kinetic energy is large, and the grinding efficiency is high. Resistant to all kinds of chemical liquid corrosion. The surface is very smooth, the inside and outside are the same, easy to clean and minimal loss to the equipment. High mechanical strength, impact resistance, dense crystallization, good toughness and no broken ball.
With the higher and higher requirements for the fineness of materials, the use of sand mills is becoming more and more common, and there are more grinding media in the market, among which zirconia beads are the leader. In coating production, zirconia beads need to be used for coating sanding. The particle size of zirconia beads will become smaller after long-term grinding. Zirconia beads with smaller particle size will reduce the sanding efficiency. It is necessary to replace new zirconia beads regularly to meet the process requirements. Therefore, it is necessary to design a device for screening small particle size zirconia beads in order to show good grinding performance and protect the machine from damage.
High purity zirconia beads are prepared by using yttria as stabilizer, titration or dry powder isostatic pressing, high temperature sintering and phasing. There are two shapes: spherical and cylindrical. The microcrystalline has a small diameter of 0.5um, which makes the medium good and has excellent wear resistance. It is especially suitable for the grinding of wet and dry ultra-fine dispersant that refuses to pollute slurry and powder by vertical high-speed mixer, high-speed rod pin grinder, all ceramic grinder for new material grinding and other equipment.
There are many methods of cell wall breaking: biological method, such as enzymatic method; Chemical method, such as acid heat method; Physical methods, such as repeated freeze-thaw method, ultrasonic wall breaking method, mechanical method and microwave method, have their own advantages and disadvantages. In recent years, zirconia bead wall breaking method is widely used because of its fast, efficient and economic characteristics. This method can break and cleave the sample in a short time, and the heat generated in the grinding process is less, which can avoid the degradation of nucleic acid and protein denaturation to the greatest extent.
Zirconia beads can be used for ultra-fine grinding and dispersion in non-metallic mining, papermaking, heavy calcium, paint, ink, electronic materials, lithium iron batteries, magnetic materials, textile dyes, medicine and other industries.
Preparation of ground silicon carbide by zirconia beads with different particle sizes: select mixed zirconia beads with different particle sizes and mix the particle sizes in zirconia beads φ Zirconia beads of 4 ~ 6mm account for 55 ~ 65%, and the particle size is φ Zirconia beads with a diameter of 3 ~ 2mm account for 20 ~ 30% φ Zirconia beads of 2 ~ 1mm account for 10 ~ 20%, and the content of zirconia in the above zirconia beads is required to be greater than 95%; According to the weight ratio, put the mixed zirconia beads: silicon carbide = 1: {1 ~ 2} into the ball mill for grinding for 1 ~ 1.5h, in which silicon carbide is black silicon carbide with silicon carbide content ≥ 95%, and then screen out the mixed zirconia beads to prepare ground silicon carbide.
In addition, zirconia beads have the following characteristics: very low (ppm level) wear (wear resistance is 30 ~ 50 times that of glass beads); Extremely high hardness; Extremely high density (can effectively improve grinding efficiency); High temperature and corrosion resistance; It can be reused for many times with low cost; Zirconia bead wall breaking method is a rapid, efficient, economical and high-throughput wall breaking method. At present, the reports on the use of zirconia beads to break the cell wall of lactic acid bacteria are mainly concentrated in foreign countries, but there is no research on the optimization of the wall breaking method of zirconia beads in terms of cell weight, grinding buffer and grinding time at home and abroad. Zirconia bead wall breaking method has good applicability for the wall breaking of lactic acid bacteria. This method may become a general and effective wall breaking method