Abstract: High alumina ball is a good neutral material, we can use it as a wear-resistant abrasive material for correct use. High alumina balls can be subdivided into 90, 92, 95, 99 series according to alumina content. The common grinding media on the market are pebbles, alumina balls, steel balls, glass balls, zirconia balls, silicon carbide balls, etc., which can be used in many fields. Let’s take a look at the detailed introduction!

What is high alumina ball

High-aluminum balls are a category of alumina balls, which are referred to as high-aluminum balls because of their high alumina content. High alumina ball is made of bauxite, roller powder, industrial alumina powder, high-temperature calcined Alpha alumina powder and other materials as raw materials, through batching, grinding, powder making, molding, drying, firing and other processes. A ball stone widely used mainly as a grinding medium.

High alumina balls can be subdivided into 90, 92, 95, 99 series according to alumina content.

The characteristics of high alumina ball

1. The high-aluminum ball has the characteristics of high purity, high strength, high hardness, high whiteness, and low abrasion, which basically has no effect on the quality of grinding materials;

2. The high-alumina ball has the characteristic of high specific gravity, which can greatly improve the grinding efficiency and reduce the grinding time;

3. The high-aluminum ball has the characteristics of low abrasion, which can greatly extend the service life of the grinding body;

4. High alumina ball has the characteristics of high temperature resistance, acid and alkali resistance, and corrosion resistance;

5. High alumina ball solves the problem of grinding media polluting raw materials.

Application scope of high shot put

High-alumina balls are widely used in different types of ceramics, enamels, glass, and chemicals due to their excellent characteristics such as high strength, high hardness, high wear resistance, high specific gravity, small size, high temperature resistance, corrosion resistance, and non-polluting. And so on the thick and hard material finishing and deep processing of the factory.

The proportion of high alumina ball

High alumina ball refers to the alumina purity above 92%, and the alumina purity below 92% is called medium high alumina ball or low alumina ball. There are also certain differences in alumina purity and specific gravity. The high alumina ball stones on the market generally have 92% content and 95% content. Let’s talk about the specific gravity standards of these two high alumina balls separately below.

The 92% content of high alumina ball stone has a specific gravity standard of 3.60g/cm³ or more. If this parameter is not met, it is a nonconforming product. If the specific gravity standard does not meet the standard, the grinding process will increase the wear and increase the production cost. 95% content of high alumina ball stone, its specific gravity standard is above 3.65g/cm³, alumina purity is higher than 95%, and it has the characteristics of high purity and low impurity content.

The specific gravity standard of high alumina ball is mainly affected by the raw material aluminum hydroxide powder and the firing temperature. Factors such as firing (not cooked), excessively coarse powder, and insufficient purity will cause the specific gravity of the ball to fail to meet the standard. Alumina balls with a low specific gravity are not wear-resistant and easy to crack, but a high specific gravity does not mean that the balls have a certain wear resistance, because over-sintered balls can also reach a higher specific gravity.

Manufacturing method of high alumina ball

First, the alumina raw material is added to the dumping electric arc furnace and melted into a liquid state, and then the furnace is poured at a certain angle, so that the solution flows out from the casting trough at a certain speed, and the liquid flow passes through the 60 to 90 degrees of the stream. The flat nozzle blows the liquid flow with a high-speed air flow with a pressure of 0.6-0.8Mpa to form a high-aluminum ball.

How to identify the quality of high alumina balls

1. From the eyes, the higher the alumina content, the whiter the color of the ball, otherwise the darker the color.

2. Check if there are indentations. Those with indentations are pressed and formed with high strength; those without indentations are rolled and have poor strength.

3. Touch it by hand. The surface is smooth, and the quality is better without roughness.