In　this　study,　numerical　and　experimental　studies　of　ice　directional　crystallization　for　the　NaCl,　Na2SO4,　MgCl2,　and　MgSO4　solutions　were　investigated.　The　comparison　of　energy　consumption　between　freezing-centrifugal　desalination　and　the　conventional　method　was　discussed.　The　phase-field　method　was　employed　to　simulate　the　ice　directional　crystallization　process.　A　microscope　experimental　setup　was　established　to　observe　the　morphology　of　dendrites　and　verify　the　theoretical　model　in　the　directional　crystallization　process.　The　absolute　deviations　of　the　average　width　of　the　brine　channel　between　numerical　and　experimental　results　are　less　than　15%,　which　indicates　that　the　phase-field　method　can　present　the　performance　of　ice　directional　crystallization　well.　The　results　also　showed　that　in　the　directional　crystallization　process,　the　solutions　with　SO42-　(Na2SO4　and　MgSO4　solutions,　and　their　mixtures)　form　narrower　brine　channels　than　that　of　NaCl　and　MgCl2　solutions　due　to　their　low　diffusion　coefficient.　Moreover,　the　impacts　of　ions　and　brine　channel　on　the　freezing-centrifugal　desalination　were　investigated　by　the　experiments.　When　the　rotation　speed　and　centrifugal　time　were　set　at　5000　rpm　and　2.0　min,　respectively,　the　salt　removal　efficiency　of　NaCl　and　MgCl2　was　higher　than　96%,　while　they　were　less　than　13%　for　the　Na2SO4　and　MgSO4　solutions.　Hence,　the　SO42-　ion　plays　a　significant　role　in　preventing　sea　ice　desalination　due　to　narrower　brine　channels.　©　2022　Elsevier　B.V.