Heat　recovery　from　blast　furnace　slag　waste　is　crucial　for　energy　saving　and　emission　reduction　in　the　iron　and　steel　industry,　but　the　traditional　water-cooled　and　air-cooled　methods　have　problems　such　as　low　recovery　efficiency,　resource　waste　and　pollution.　Molten　salt,　having　high　heat　capacity　and　excellent　heat　transfer　performance,　can　convert　intermittent　waste　heat　into　continuous　heat　energy　and　enhance　the　utilization　efficiency.　This　paper　proposes　a　waste　heat　recovery　technology　based　on　direct　contact　between　the　blast　furnace　slag　particles　and　molten　salt.　The　flow　and　heat　transfer　characteristics　of　high-temperature　particles　in　four　moving-bed　arrangement　schemes　are　simulated　using　computational　fluid　dynamics　and　the　discrete　element　method.　The　effects　of　the　arrangement　schemes　and　particle　size　on　the　performance　of　waste　heat　recovery　are　also　investigated.　Among　the　different　arrangements,　the　countercurrent　a　arrangement　maximized　both　the　cooling　rate　(109.17　K/s)　and　the　waste　heat　recovery　rate　(50.40　%).　Under　the　same　conditions,　the　recovery　rate　of　the　4　mm　diameter　particles　reached　59.87　%　and　the　fluid　outlet　temperature　of　the　5　mm　diameter　particles　reached　649.25　K.　The　synergistic　effect　of　the　countercurrent　arrangement　and　small　particle　size　substantially　enhanced　the　waste　heat　recovery　efficiency.　This　study　provides　a　theoretical　basis　and　engineering　guidance　for　optimizing　the　heat　utilization　from　blast　furnace　slag　waste.　©　2025　Elsevier　Ltd