Did the graphite crucible explode? The graphite crucible exploded when it was heated. I don't know why it happened. To avoid this situation from happening again, there are some suggestions based on years of production experience.
1. The damp crucible is suddenly heated to high temperatures, causing it to burst. Although graphite crucibles are famous for their high temperature resistance, the temperature needs to be raised slowly and operated in compliance with regulations. Specific method: "Without adding materials, it takes about 30 minutes to preheat the crucible to about 200°C and dry it for 60 minutes." The purpose is to volatilize the water on the surface of the crucible. Remember, this step is extremely important.
2. Thermal expansion causes the crucible to burst. After the work is completed, when the graphite crucible appears red, be sure to cut off the metal material attached to the wall of the clean crucible immediately. Reason: Excessive residue will affect heat transfer, increase dissolution time, and easily cause thermal expansion or bursting of the crucible.
Cleaning method:
First, remove the chemicals from the graphite crucible and then clean it. It should be noted that the specific cleaning raw materials are determined according to the residue in the crucible. Under normal circumstances, the residues on the crucible wall are mostly inorganic combustion residues, which can be cleaned with hydrochloric acid. For those residues that are difficult to clean, we don't have to worry too much. They can be boiled in dilute hydrochloric acid or nitric acid. Note that you can choose one of the two, but cannot use them at the same time.