Flotation　test,　adsorption　test,　and　solution　chemical　calculations　were　used　to　investigate　the　effect　of　siderite　and　dolomite　on　quartz　flotation　in　sodium　oleate　flotation　system.　The　results　of　flotation　and　adsorption　tests　showed　that　the　effect　of　siderite　on　quartz　flotation　is　related　to　the　dissolved　siderite　species　and　starch,　and　siderite　significantly　influences　flotation　of　quartz　in　the　presence　of　starch.　The　negative　effect　of　dolomite　on　quartz　flotation　could　be　whittled　by　increasing　the　dosage　of　sodium　oleate.　The　solution　chemical　calculations　indicated　that　dissolved　siderite　species　might　convert　the　initial　surface　of　active　quartz　to　CaCO3　precipitates　which　can　be　easily　depressed　by　starch,　while　the　dolomite　dissolution　is　restrained　by　calcium　ions　in　the　solution,　which　might　explain　the　difference　of　effects　on　quartz　flotation　between　dissolved　siderite　species　and　dissolved　dolomite　species.　©　2017,　Editorial　Department　of　Journal　of　Northeastern　University.　All　right　reserved.