Vertical stirred mill is a typical ultra-fine grinding equipment, which is commonly used in fine grinding or re-grinding operations of silver ore, molybdenum ore, lead-zinc ore, manganese ore, iron ore and nickel ore, etc., and is also used for grinding chemical materials. During the grinding process, the inner cylinder of the mixer has to face high temperature, corrosion, strong impact and severe friction, which leads to the need to replace and overhaul the inner cylinder of the mixer from time to time, which not only wastes manpower and material resources, increases costs, but also reduces the purity of materials and affects product quality. ZTA ceramic lining effectively solves this problem.

Analysis of the working conditions of the vertical stirred mill

1. High wear: In the process of grinding materials, the grinding ball and the material will rotate at high speed in the inner cylinder, which will cause severe friction on the inner cylinder wall. Moreover, many materials have very sharp edges and corners in the grinding process, and the cutting wear is serious, which will cause high wear of the inner cylinder of the stirring mill.

2. Strong impact: The grinding ball and materials rotating at high speed will constantly impact the inner cylinder of the stirring mill, causing a large load to the inner cylinder.

3. High temperature: high-speed rotation of grinding balls and materials and violent friction will produce high temperature, which is also a key consideration in the selection of materials and anti-wear of the inner cylinder.

4. Acid and alkali corrosion: some chemical materials will have strong corrosiveness, and materials with more chemically active properties such as metals are easy to be corroded, so that they cannot work normally or affect product quality.

Abrasion, impact, and corrosion will not only damage the inner cylinder itself, but also reduce the purity of the material and affect the quality of the product.

ZTA ceramics are alumina and zirconia composite ceramics, and the ZTA ceramic sheet is installed on the inner cylinder wall of the stirring mill by the dovetail card groove installation method to form an anti-wear layer. The anti-wear layer not only has the hardness of alumina, excellent anti-wear ability, but also has the toughness of zirconia, which can effectively resist impact, and the dovetail card groove installation method can withstand high temperatures, and the chemical inertness of α-alumina makes it have strong corrosion resistance. Therefore, the vertical stirred mill ZTA ceramic inner cylinder can be a good fit for the stirred mill. The customer reported that the service life of the inner cylinder of the stirring mill installed with ZTA ceramics was more than three years, the number of replacement and maintenance was greatly reduced, which saved costs, and the ZTA ceramics basically did not produce grinding chips, which was also conducive to improving the purity of the materials.