The　waste　printed　circuit　board　smelting　ash　(WPCB-SA)　produced　in　the　waste　printed　circuit　board　smelting　process　is　a　hazardous　material　that　not　only　contains　valuable　metals,　but　also　contains　a　large　amount　of　toxic　and　harmful　inorganic　bromides.　The　utilization　of　metals　has　received　considerable　attention　in　previous　studies,　but　the　recovery　of　hazardous　bromides　requires　further　study.　In　this　article,　a　new　idea　of　converting　inorganic　bromine　in　WPCB-SA　by　traditional　sulfated　roasting　is　proposed.　Debromination　kinetics　under　simulated　experimental　conditions　are　discussed,　and　kinetic　equations　are　established.　The　kinetic　results　show　that　during　low-temperature　sulfated　roasting,　the　conversion　of　Br　in　CuBr　and　PbBr2　conforms　to　the　chemical　reaction　diffusion　model　and　diffusion　control　the　product　layer　model,　respectively.　A　possible　reaction　mechanism　is　also　proposed.　Our　research　shows　that　the　conversion　of　Br　in　CuBr　is　divided　into　three　processes:　covalent　bond　decomposition,　hydrogen　ion　form　acid,　copper　ion　form　salt,　and　HBr　oxidation　conversion,　whereas　the　conversion　of　Br　in　PbBr2　is　divided　into　two　processes:　sulfuric　acid　ionization,　lead　ion　form　salt　and　HBr　oxidation　conversion.　This　work　provides　the　theoretical　basis　for　the　improvement　and　application　of　inorganic　bromide　recovery　technology　in　WPCB-SA.　©　2021　Elsevier　B.V.