Clay graphite crucibles, kuma aka sani da graphite piles ko narkakken ladle na jan karfe, kayan aiki ne masu mahimmanci a fagen narke ƙarfe. Ana amfani da waɗannan crucible da farko don narka karafa marasa ƙarfe kamar su jan karfe, tagulla, zinariya, azurfa, zinc, da lea ...
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