NaY　zeolites　are　synthesized　using　submolten　salt　depolymerized　natural　perlite　mineral　as　the　main　silica　and　alumina　sources　in　a　0.94　L　stirred　crystallizer.　Effects　of　alkalinity　ranging　from　0.38　to　0.55　(　n　(Na　2　O)/　n　(SiO　2　))　on　the　relative　crystallinity,　textural　properties　and　crystallization　kinetics　were　investigated.　The　results　show　that　alkalinity　exerts　a　nonmonotonic　in　fluence　on　the　relative　crystallinity　and　textural　properties,　which　exhibit　a　maximum　at　the　alkalinity　of　0.43.　The　nucleation　kinetics　are　studied　by　fitting　the　experimental　data　of　relative　crystallinity　with　the　Gualtieri　model.　It　is　shown　that　the　nucleation　rate　constant　increases　with　increasing　alkalinity,　while　the　duration　period　of　nucleation　decreases　with　increasing　alkalinity.　For　n　(Na　2　O)/　n　(SiO　2　)　ratios　ranging　from　0.38　to　0.55,　the　as　-synthesized　NaY　zeolites　exhibit　narrower　crystal　size　distributions　with　the　increase　in　alkalinity.　The　growth　rates　determined　from　the　variations　of　average　crystal　size　with　time　are　51.09,　157.50,　46.17　and　24.75　nm　$h　-1　,　respectively.　It　is　found　that　the　larger　average　crystal　sizes　at　the　alkalinity　of　0.38　and　0.43　are　attributed　to　the　dominant　role　of　crystal　growth　over　nucleation.　Furthermore,　the　combined　action　of　prominent　crystal　growth　and　the　longer　duration　periods　of　nucleation　at　the　alkalinity　of　0.38　and　0.43　results　in　broader　crystal　size　distributions.　The　findings　demonstrate　that　control　of　the　properties　of　NaY　zeolite　and　the　crystallization　kinetics　can　be　achieved　by　conducting　the　crystallization　process　in　an　appropriate　range　of　alkalinity　of　the　reaction　mixture.　(c)　2024　The　Chemical　Industry　and　Engineering　Society　of　China,　and　Chemical　Industry　Press　Co.,　Ltd.　All　rights　reserved.