Sib nqus rods yog tshwj xeeb tshaj yog nyob rau hauv kev lag luam ua zaub mov, siv los tshem tawm cov hlau impurities los ntawm raw cov ntaub ntawv, xyuas kom meej cov khoom purity thiab kev nyab xeeb. Piv txwv li, ntawm cov kab ntau lawm rau cov khoom noj hmoov xws li hmoov nplej, qab zib hmoov, thiab mis hmoov, cov khoom siv hlau nplaum tuaj yeem nqus tau zoo thiab tshem tawm cov hlau me me xws li hlau filings thiab hlau hmoov, tiv thaiv cov impurities los ntawm kev ua phem rau cov neeg siv khoom noj qab haus huv. Tsis tas li ntawd, cov hlau nplaum sib nqus tau siv dav hauv kev lag luam tshuaj, tshuaj, plastics, thiab roj hmab kev lag luam kom cais cov ferromagnetic impurities los ntawm cov khoom siv raw, txhim kho cov khoom zoo.