Alumina grinding ball
Alumina grinding balls refer to materials such as bauxite, roller powder, industrial alumina powder, high temperature calcined alpha alumina powder, etc., after batching, grinding, milling (pulping, mud making), forming, drying In the process of firing, etc., it is a ball which is widely used as a grinding medium. According to different alumina content, it can be divided into medium aluminum ball, medium high aluminum ball and high aluminum ball. Generally, we classify 60%-65% alumina content as medium aluminum ball, 75%-80% alumina content as medium-high aluminum ball, and 90% or more alumina content as high-aluminum ball. Among them, the high aluminum ball is subdivided into 90 porcelain, 92 porcelain, 95 porcelain and 99 porcelain. Due to its extremely high production cost, 99 porcelain is rarely manufactured by large manufacturers in large quantities. At present, it is mainly made by hand in some special ceramics factories. The medium aluminum ball and the medium high aluminum ball are accepted by most ceramic factories because of their low price, and are mainly used for grinding ceramic blanks. High aluminum ball is widely used in different types of ceramics, enamel, glass, chemical industry because of its high strength, high hardness, high wear resistance, excellent specific gravity, small volume, high temperature resistance, corrosion resistance and pollution-free. Such as the factory's thick and hard material finishing and deep processing, especially the 92-content high aluminum ball is most commonly used. The laboratory measures the abrasion resistance and impact resistance of alumina abrasive balls:
Method Principle Editing The method is to impact the ball by the alumina ball in a polyurethane tank under the specified conditions, and to evaluate the impact performance of the ball. The wear resistance of the alumina ball is represented by unit time wear.
The grinding tank editing grinding tank uses a polyurethane tank. Inner diameter 200mm, length 220mm
The abrasion resistance test editor ensures that the A2 grinding tank containing 4kg of alumina balls and 4L of tap water can be continuously operated at 80r/min.
The test prepared an alumina ball sample with an acceptable appearance quality and appearance size of about 4 kg, loaded into an A2 grinding tank, and added 4 L of tap water, and ground at 80 r/min for 2 h on a wear-resistant impact tester. The sample was taken out and washed with water and dried for use.
Test procedure Edit A5.1 Samples processed according to A4, weigh m1 with balance with a sensitivity of 0.1g; A5.2 The above samples are placed in A2 grinding tank, add the same weight of water, no water leakage after capping, put On the abrasion tester, the mill was ground at 80 r/min for 24 h and then stopped. A5.3 Remove the sample from the grinding jar, wash it with water, and dry it and weigh m2. A5.4 Measure the average diameter D of 10 balls as specified. The results of A6 indicate that the impact and abrasion tests are free from cracks and breakage, and are considered to be acceptable for impact resistance. EWT=KD(m1-m2)/m1 where: EWT-wear ‰; K-correction factor, 4.17X10-4 (mm)-1D-ball average diameter, mm; m1-total weight of sample before grinding, g ;m2-the total weight of the sample after self-grinding, g;