Ntuj magnetite muaj nyob rau hauv cov hmoov zoo, cais raws li mesh 325 nrog hais txog 45 micron los yog me dua. Ntuj magnetite yog nyob rau hauv cov xim dub tsaus thiab nws yog cov hlau nplaum heev.
Nyeem ntxivHauv kev ua haujlwm drilling thiab tsim khoom, tsis yog dej-raws li av nkos nkaus xwb tab sis kuj tseem tuaj yeem npaj cov av nkos, thiab nws qhov kev ua tau zoo yog qhov zoo tshaj ntawm cov khoom hnyav hnyav.
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