An　efficient　process　for　recycling　Eu　from　BaMgAl11O19:　Eu2+　(BAM)　waste　phosphors　has　been　developed.　The　treatment　of　BAM　by　the　sodium　peroxide　(Na2O2)　calcining　process　followed　by　acid　leaching　was　investigated.　The　results　demonstrated　that　the　calcination　temperature　and　time　more　significantly　influence　the　recovery　efficiencies　of　metals　than　does　the　mass　ratio　of　Na2O2　to　BAM.　More　than　99%　of　Eu　was　recovered　under　the　optimal　conditions　of　425　degrees　C,　mass　ratio　1:1　and　30　min　duration.　The　decomposition　kinetics　of　BAM　were　studied　using　a　series　of　typical　solid-solid　reaction　kinetic　models.　The　apparent　activation　energies　E-a　for　the　decomposition　reactions　of　Eu,　Ba,　Al　and　Mg　were　calculated　as　52.3　kJ/mol,　64.6　kJ/mol,　87.1　kJ/mol　and　88.9　kJ/mol,　respectively.　XRD　analysis　indicated　that　the　decomposition　of　BAM　involved　a　multistep　reaction.　The　reaction　mechanism　was　also　analyzed　at　the　crystal　structure　level,　which　indicated　that　Ba　and　Eu　atoms　in　the　mirror　plane　of　the　unit　cell　of　BAM　were　replaced　by　Na　from　Na2O2　at　the　beginning,　and　that　BaO2　and　Na2MgAl10O17　were　produced.　Then,　Na2MgAl10O17　was　decomposed　to　NaAl7O11　and　MgAl2O4,　and　finally,　NaAlO2,　MgO,　BaCO3　and　Eu2O3　were　generated　at　a　higher　temperature　(600　degrees　C).　SEM　and　EDS　analysis　also　demonstrated　the　proposed　substitution　and　decomposition　reactions.　This　work　is　expected　to　open　new　avenues　and　provides　a　theoretical　basis　for　the　highly　efficient　recovery　of　Eu　from　waste　rare　earth　phosphors.