Introduction to the use of graphite crucibles

The graphite crucible is made of high-purity graphite material. It has advantages such as high temperature resistance, corrosion resistance, and good thermal conductivity, and is widely used in fields such as chemistry, metallurgy, and pharmaceuticals. Next, I will introduce to you the usage method and related precautions of graphite crucibles.

Firstly, before using a graphite crucible, it is necessary to check its appearance for completeness, without obvious damage or cracks. If there are any issues, please do not use it to avoid affecting the experimental results. At the same time, clean the inner and outer walls of the graphite crucible with clean warm water and neutral acid alkali solution to ensure its surface is clean.

Before use, it is necessary to preheat the graphite crucible. Place the graphite crucible into the furnace, gradually increase the temperature to the required experimental temperature, and maintain it for a period of time to ensure uniform temperature inside and outside the crucible. Note that during the heating process, sharp temperature changes should be avoided to avoid causing the graphite crucible to rupture.

In specific experimental operations, the use of graphite crucibles mainly includes the following aspects:

1. Beaker heating: Place the solution to be heated into a graphite crucible, and then place the graphite crucible on the heating equipment for heating. Due to its excellent thermal conductivity, graphite can quickly conduct heat and improve heating efficiency.

2. Combustion analysis: Graphite crucibles can be used for combustion analysis experiments, such as determining the carbon content of organic matter. Place the sample to be tested in a graphite crucible, and then heat it in the furnace to a high temperature to completely burn the sample. By measuring the change in crucible mass, the carbon content in the sample can be calculated.

3. Melting experiment: Graphite crucibles can withstand high temperatures, so they are suitable for melting experiments. Place the substance to be melted into a graphite crucible and then heat it in a high-temperature furnace. The high purity and corrosion resistance of graphite crucibles can ensure the accuracy and reliability of experiments.

It should be noted that when using graphite crucibles, sudden temperature changes should be avoided to avoid causing thermal stress and cracking. In addition, during the heating or cooling process, it is not advisable to use metal tools to contact the graphite crucible to avoid scratching or damaging the surface. When cleaning, soft brushes or sponges should be used, and hard brushes should be avoided to avoid scratching the surface.

After use, the graphite crucible should be cooled to room temperature before cleaning and storage. When placing, avoid contact with sharp or hard objects to avoid damaging the graphite crucible.