Pilot　scale　flotation　tests　(maximum　capacity　1　mt　h(-1))　on　refloating　smithsonite　from　sulphide　flotation　tail　using　cyclonic　static　microbubble　flotation　column　(FCSMC)　were　carried　out　at　the　Wulagen　Mine　site.　FCSMC　is　easy　to　install　and　operate,　ideal　for　pilot　tests.　Condition　(optimisation)　tests　were　carried　out　first　to　verify　the　reagent　scheme　obtained　in　previous　bench　scale　tests　in　lab.　Similar　conclusions　with　lab　bench　scale　tests　can　be　obtained:　(1)　Normal　alkyl　ether　amine　OPA　1214　is　a　suitable　collector.　(2)　Sodium　carbonate,　sodium　silicate　and　sodium　sulphide　is　suitable　modifier　combination.　(3)　Desliming　promoted　smithsonite　flotation.　But　dosages　of　ether　amine　and　sodium　sulphide　in　pilot　scale　flotation　tests　were　lower.　Continuing　tests　was　carried　out　after　rougher　conditions　were　optimised.　First　test　had　one　rougher,　one　scavenger　and　two　cleanings.　A　cleaning　concentrate　was　obtained　with　a　Zn　grade　higher　than　20%,　but　recovery　was　low　(＜20%).　To　increase　the　Zn　recovery,　process　modifications　were　made　including　converting　the　scavenger　stage　into　the　second　rougher　stage,　and　combining　two　rougher　concentrates　as　cleaning　feed.　A　concentrate　with　an　average　grade　higher　than　30%　and　recovery　higher　than　50%　was　obtained.　Based　on　particle　size　analysis　on　products　of　continuing　tests,　FCSMC　showed　stronger　collecting　power　and　selectivity　for　fine　smithsonite　particles,　which　is　suitable　for　treating　this　feed.