Nanoparticles　α-Fe2O3　were　prepared　using　the　waste　liquid　after　recycling　rare　earths　in　Nd-Fe-B　waste　magnets.　The　most　α-Fe2O3　particles　have　around　60-120nm　diameters　with　the　surface　area　of　144.51　m2　g-1　and　pore　size　of　around　5.0　nm.　Methylene　blue　was　used　as　a　model　pollutant　to　study　the　adsorption　properties　of　the　obtained　α-Fe2　O3　nanoparticles.　The　effects　of　contact　time,　pH　value,　loading　mass　of　α-Fe2O3,　and　temperatures　on　the　adsorption　behavior　were　investigated.　Results　indicated　that　ultra-refined　α-Fe2O3　particles　can　achieve　an　adsorption　rate　of　98%　for　the　removal　of　methylene　blue　from　waste　liquids.　Also,　the　removal　of　methylene　blue　by　α-Fe2O3　particles　presented　an　adsorption　isotherm　process　which　strongly　fitted　the　pseudo-second-order　kinetics　model　and　Langmuir　equation.　The　present　work　demonstrates　a　sustainable　and　efficient　methodology　for　the　re-use　of　Fe　from　magnet　wastes　and　removal　of　MB,　opening　a　promising　and　cost-effective　avenue　for　the　sewage-cleaning.　©　2021,　S.C.　Virtual　Company　of　Phisics　S.R.L.　All　rights　reserved.