Hematite　reverse　flotation　pulp　is　seriously　deteriorated　by　chlorite　due　to　the　dissolution　of　chemical　components　(e.g.,　metal　ions)　on　its　surface.　This　study　focused　on　the　effect　of　sodium　alginate　on　hematite　reverse　flotation.　The　results　indicated　that　the　addition　of　sodium　alginate　contributes　to　improving　the　chlorite　entrainment　recovery　rate.　The　results　of　surface　tension　and　solution　viscosity　tests　along　with　the　foam　properties　measured　by　the　Foamscan　analyzer　demonstrated　that　the　foam　generation　time　reduces　and　the　liquid　volume　in　the　foam　layer　increases　with　the　addition　of　sodium　alginate,　further　increasing　the　foam　stability　and　chlorite　entrainment　rate.　In　addition,　theoretical　analysis　of　Plateau＇s　foam　structure　balance　law　supports　this　conclusion.　This　paper　is　significant　as　it　addresses　the　challenging　problem　of　chlorite-containing　hematite　reverse　flotation.　©　2021　Elsevier　Ltd