We all know that the tank and grinding balls of the planetary ball mill are removable, which provides conditions for material replacement. We can choose tanks and balls of different materials according to the type of sample.
Let us take a look at the different materials of grinding balls and how to choose the appropriate material.
There are many types of grinding ball materials for planetary ball mills. The ones commonly used in laboratories include stainless steel, alumina / corundum, agate, zirconia, tungsten carbide, etc.
There are so many materials for grinding balls, which material is better?
How should we choose the appropriate material for grinding balls according to the actual situation?
For the selection of grinding ball material, we take the sample and ball mill tank material as the starting point, and then judge from several aspects such as hardness, corrosion resistance, wear resistance, sample contamination, and economy.
In terms of hardness, the hardness value of the grinding ball material should be less than or equal to the ball mill jar and greater than the sample. If the hardness of the grinding ball is relatively small, the sample cannot be ground. If the hardness is greater than the ball grinding jar, the ball grinding jar may be damaged and pitted during the long-term grinding process.
In terms of corrosion resistance, we will encounter some samples with strong acid and alkali. If we choose grinding balls with inappropriate materials, such as stainless steel grinding balls, the grinding balls may be corroded and damaged, and then cause contamination to the samples.
In terms of wear resistance, some grinding balls made of materials are not particularly wear-resistant, such as corundum grinding balls. Although they have a high hardness, they are prone to slag during the grinding process, thus affecting the purity of the sample.
Sample contamination and wear resistance are somewhat similar. Some samples are not allowed to be mixed with other substances during testing and analysis, otherwise the experimental results will be inaccurate. For example, stainless steel ball mill jars and grinding balls cannot be used for heavy metal detection in soil samples. When stainless steel is ground, some metals will be mixed into the soil, thus affecting the detection results. Therefore, we can choose grinding balls with better wear resistance such as agate and zirconia.
The economics are easier to understand, that is, the cost of purchasing grinding balls. Higher-priced materials have better performance in all aspects, but the cost-effectiveness issue must be taken into consideration. There is no so-called good material, only whether it is suitable or not.
For example, tungsten carbide material is definitely better than stainless steel material in all aspects, but if the grinding can be completed with stainless steel grinding balls instead of tungsten carbide grinding balls, it will be overkill. For example, for grinding soil, if no test reports are issued and it is only used for teaching experiments, nylon grinding balls are also a good choice.
This concludes the introduction to the issues related to the material of the grinding balls of planetary ball mills. There are many types of laboratory samples, and the grinding conditions are also different. Therefore, the configuration schemes of the ball mill jars and grinding balls may be different, which requires a combination of experience and Determine through actual testing.
If you have any needs, please contact Kingda salesperson:
Shirley Liu (Ms)
Email: Sales4@Kingdacera.com
She will provide you with the most professional advice
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