Txawm hais tias graphite crucibles muaj cov yam ntxwv xws li kev kub ceev, kub tsis kam, hloov hluav taws xob sai, tiv thaiv cov kua qaub thiab alkali corrosion, siab zog ntawm qhov kub thiab txias, thiab oxidation kuj zoo heev, ntxuav lawv tom qab siv yuav teeb meem, tshwj xeeb tshaj yog thaum ua cov ntaub ntawv raw.
Thawj kauj ruam hauv kev tu lub graphite crucible yog tshem tawm cov tshuaj lom neeg hauv tsev, ua raws li kev ntxuav. Txoj kev ntxuav yog nyob ntawm seb hom residue seem hauv lub crucible. Feem ntau, cov deposits ntawm graphite crucibles yog inorganic combustion residues, uas tuaj yeem ntxuav nrog hydrochloric acid, vim lawv feem ntau yog soluble. Txawm li cas los xij, qee qhov seem uas muaj cov pa roj carbon monoxide tsis soluble hauv hydrochloric acid. Hauv cov xwm txheej zoo li no, nitric acid tuaj yeem siv los ntxuav, vim nws muaj zog oxidizing zog. Cov cua kub kuj tseem siv tau thaum lub sijhawm ntxuav.
Rau cov khoom uas tseem nyuaj rau ntxuav, lawv tuaj yeem boiled hauv dilute hydrochloric acid los yog dilute nitric acid. Nco ntsoov tias hydrochloric acid siv yuav tsum tsis muaj oxidizing cov neeg ua haujlwm xws li nitric acid, nitrates, lossis halogens. Yog tias dilute nitric acid tseem tsis txaus rau kev tu, ces molten potassium pyrosulfate, sodium carbonate, lossis borax tuaj yeem siv los ntxuav.
Graphite crucibles yuav tsum tau ua kom huv si, nrog rau ob qho tib si sab hauv thiab sab nrauv yog ci thiab ci. Tom qab lub cua sov ntev, cov txheej txheej ntawm lub crucible yuav dull, thiab dhau sij hawm, qhov dullness yuav nkag mus rau sab hauv, ua rau lub crucible nkig thiab tawg. Yog li ntawd, tej yam tsis huv yuav tsum tau muab tshem tawm. Yog hais tias tseem muaj cov stains los yog cov npoo yog npub, maj mam rub lub npoo nrog cov xuab zeb zoo uas tau dhau los ntawm 100-mesh sieve thiab tsis muaj cov npoo ntse, siv dej ua cov roj nplua nyeem, txhawm rau rov qab ua kom lub ntsej muag ci.