Cov khoom siv tooj liab yog cov khoom siv tsis hloov dua tshiab, tus nqi sib tw yuav dhau los ua tus nqi ntau dua, thiab tus nqi ntawm cov khoom graphite yuav ruaj khov. Xyoo tsis ntev los no, tus nqi ntawm cov khoom siv tooj liab tau txuas ntxiv nce siab, thiab cov tuam txhab graphite loj tau txuas ntxiv txhim kho cov txheej txheem ntawm kev tsim cov graphite kom nws raug nqi ntau dua.
Thaum tam sim no, muaj ntau qib sib txawv ntawm graphite rau cov sib txawv ntawm cov neeg muag khoom ntiaj teb graphite. Feem ntau muab cais raws li qhov nruab nrab particle inch ntawm graphite cov ntaub ntawv, particle lub cheeb ≤φ4 μm txhais tias yog graphite zoo, qhov nruab nrab ntawm φ5 ~ φ10 μm yog txhais tias yog graphite nruab nrab, thiab cov lus saum 10 μm tau txhais ua co graphite. Qhov me qhov me qhov loj me dua, cov khoom siv kim dua. Koj tuaj yeem xaiv cov khoom graphite uas tsim nyog raws li cov kev xav tau thiab nqi ntawm EDM.