In the process of smelting, reasonable arrangement should be made for the melting atmosphere of graphite crucible to avoid impurity as far as possible.

The graphite crucible should be placed on the iron tripod and the surrounding environment should be stable.

The graphite crucible should be removed with crucible forceps after heating. Graphite crucible can not be suddenly cooled, otherwise it will shorten the service life of graphite crucible.

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