A　co-precipitation　process　was　used　to　recover　composite　powders　from　a　NdFeB　slurry.　The　most　appropriate　concentration　of　HCl　and　a　v/w　ratio　were　obtained　in　the　leaching　process.　The　optimum　pH　range　for　the　coprecipitation　process　was　determined　by　the　log[Me(Nd,　Fe,　Co,　Pr)]-pH　curve　simulated　using　a　thermodynamics　model.　Fe2O3,　Fe2O3　center　dot　Nd2O3,　and　Pr2CoO4　phases　were　detected　in　the　final　composite　powders　after　firing　the　co-precipitated　products　at　1273　K　for　2　h.　The　content　of　the　valuable　metals　(Nd,　Pr,　Co,　Fe)　in　the　obtained　composite　powders　was　greater　than　99.4%,　which　meets　the　raw　material　requirements　for　preparing　recycled　NdFeB　magnetic　powders.　The　main　advantages　of　the　co-precipitation　process　are　that　it　is　efficient,　low-cost,　and　environmentally　friendly.　(C)　2014　Elsevier　B.V.　All　rights　reserved.