In　order　to　effectively　eliminate　the　effect　of　fine　carbonate　minerals　on　quartz　flotation,　the　influence　of　fine　siderite　on　quartz　flotation　was　studied　as　well　as　the　mechanism　or　role　of　ultrasonic　treatment　in　the　process.　The　results　of　adsorption　capacity　measurement　and　flotation　solution　chemical　calculation　show　that　fine　siderite　and　its　dissolved　components　have　a　great　influence　on　the　collector　consumption　and　the　surface　properties　of　quartz.　In　addition,　SEM,　EDS　and　XPS　analysis　were　used　to　study　the　surface　morphology　and　chemical　environment　changes　of　quartz　with　and　without　ultrasonic　treatment.　The　results　of　flotation　test　show　that　the　recovery　of　quartz　increase　from　38.79%　to　58.38%　under　the　condition　that　ultrasonic　time　was　0.5　min　and　ultrasonic　power　was　200　W.　The　mechanical　effect　caused　by　ultrasonic　cavitation　can　clean　the　quartz　surface　to　a　certain　extent　and　increase　its　active　sites,　thus　improving　the　floatability　of　quartz.