Seasoning a graphite crucible? - Bladesmith's Forum

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For substances that are still difficult to clean, boil them with dilute hydrochloric acid or dilute nitric acid. Note that the hydrochloric acid used must not contain nitric acid, nitrates, halogens and other oxidants. If dilute nitric acid does not wash, melt with pyrosulfate potassium, sodium carbonate, or borax.

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The graphite crucible needs to be kept clean and bright inside and out. After a long time of burning, the appearance of the crucible may be dull, time will be deep inside, resulting in the crucible fragile, broken. So unclean substances must be removed. If the surface is still stained or blackened, use 100 mesh fine sand without sharp edges and corners, gently rub with water to restore the surface luster.

Although the graphite crucible has the characteristics of large volume density, high temperature resistance, fast heat transfer, acid and alkali corrosion resistance, high temperature strength, strong oxidation resistance, but it is very troublesome to clean up individual raw materials after use.

The first task of cleaning the graphite crucible is to clean the chemical substances in the crucible, and then clean. We need to decide what to use for cleaning based on the residue in the graphite crucible. General graphite crucible on the adhesion is the residue of inorganic combustion, we can use hydrochloric acid cleaning, most of it is soluble. Some residues containing carbon cannot be dissolved by hydrochloric acid. At this time, you can use nitric acid to clean, because nitric acid oxidation is very strong, cleaning can also be properly heated.

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