During the pre-grinding process of laboratory solid samples, we often encounter some strongly acidic, alkaline or corrosive samples, such as electrode materials.
These samples are highly corrosive and special care must be taken during grinding.
Since the sample will be in direct grinding with the ball mill jar, grinding ball and other components when grinding it with a ball mill, it is necessary to make a reasonable selection.
Here we will share with you the precautions when grinding strong acid, alkali and corrosive samples.
Precautions for ball milling strongly acidic, alkaline and corrosive samples:
Due to the chemical characteristics of strongly acidic, alkaline and corrosive samples, we need to pay attention to the materials of these supporting containers and objects when selecting the containers, ball mill jars, and grinding balls that are in direct contact with them to avoid certain chemical interactions with the samples. reaction, especially the ball mill tank.
When the ball mill is grinding, the grinding balls will undergo high-frequency impacts, strong friction, and extrusion.
This process will generate a large amount of heat. If a chemical reaction occurs between the ball mill jar, the grinding balls, and the sample to be ground, it will not only cause contamination of the sample materials.
Which greatly reduces the grinding effect and causes irreversible damage to the ball mill jar and grinding balls.
Ball mill tanks are made of various materials, and common acid and alkali resistant materials include PTFE (polytetrafluoroethylene), tungsten carbide, zirconia, nylon, etc.
Nylon ball mill jars and grinding balls. Nylon is relatively corrosion-resistant and alkali-resistant, but it is not acid-resistant, especially strong acids.
1. Nylon has strong water absorption, which will reduce its mechanical properties during wet grinding, which is not conducive to grinding.
2. From the perspective of material characteristics and cost factors, PTFE (polytetrafluoroethylene) has a relatively low cost and stable material properties.
3. Although its service life is short, the ball mill jar and grinding balls made can effectively grind acid-base and It is a good choice for highly corrosive samples.
Zirconia and tungsten carbide are materials with relatively stable physical and chemical properties and excellent acid and alkali resistance and corrosion resistance.
Although they are slightly more expensive, you can choose this if the experimental requirements are very high and the budget is sufficient. Two types are used as the main abrasive materials.
When we need to grind such samples in the laboratory, we must pay more attention to avoid failure to achieve the expected sample grinding effect.
For more information or any inquiry, you can contact our salesperson:
Shirley Liu (Mr.)
Email: Sales4@kingdacera.com
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