Graphite Crucible, wanda kuma aka sani da narkakken ladle na jan karfe, narkakken jan ƙarfe, da sauransu, yana nufin nau'in crucible da aka yi ta hanyar harbin graphite, yumbu, silica da kakin zuma azaman albarkatun ƙasa. Ana amfani da ginshiƙan ginshiƙan ginshiƙai da yawa don narka tagulla, tagulla, zinare, azurfa, zinc da gubar da sauran karafa da ba na ƙarfe ba da kayan haɗin gwiwa.
Graphite crucible an yi shi da graphite flake na halitta azaman babban kayan albarkatun ƙasa da yumbu mai jujjuyawar filastik ko carbon azaman ɗaure. Yana da halaye na tsayin daka na zafin jiki, ƙarfin wutar lantarki mai ƙarfi, juriya mai kyau da kuma tsawon rayuwar sabis. A cikin aiwatar da amfani da babban zafin jiki, ƙimar haɓakar haɓakar thermal ƙananan ƙananan ne, kuma yana da ƙayyadaddun juriya ga saurin sanyi da saurin zafi. Yana da juriya mai ƙarfi ga maganin acidic da alkaline, yana da kyakkyawan kwanciyar hankali na sinadarai, kuma baya shiga cikin kowane halayen sinadarai yayin aikin narkewa. bangon ciki na crucible graphite yana da santsi, kuma ruwan narkakken ƙarfe ba shi da sauƙi don zubarwa da mannewa bangon ciki na crucible, don haka ƙarfen ruwa yana da ruwa mai kyau da haɓaka, kuma ya dace da simintin gyare-gyare daban-daban. . Saboda kyawawan halaye na graphite crucible da aka ambata a sama, ana amfani da shi sosai don ƙona kayan aiki na ƙarfe da narkar da karafa marasa ƙarfe da gami.