A　new　coated-reactive　reverse　flotation　method　based　on　the　generation　of　CO　2　bubbles　at　a　calcite　surface　in　acidic　solution　was　used　to　separate　calcite　from　scheelite.　The　dissolution　kinetics　of　coated　and　uncoated　calcite　were　studied　in　sulfuric　acid.　The　CO　2　bubbles　generated　on　the　uncoated　calcite　particle　surface　are　enough　to　float　the　particle.　However,　most　of　these　bubbles　left　the　surface　quickly,　preventing　calcite　from　floating.　Here,　a　mixture　of　polyvinyl　alcohol　polymer　and　sodium　dodecyl　sulfonate　was　used　to　coat　the　mineral　particles　and　form　a　stable　membrane,　resulting　in　the　formation　of　a　stable　foam　layer　on　the　calcite　surface.　After　the　calcite　is　coated,　the　generated　bubbles　could　be　successfully　captured　on　the　calcite　surface,　and　calcite　particles　could　float　to　the　air-water　interface　and　remain　there　for　more　than　one　hour.　Flotation　tests　indicated　that　a　high-quality　tungsten　concentrate　with　a　grade　of　more　than　75%　and　a　recovery　of　more　than　99%　could　be　achieved　when　the　particle　size　was　between　0.3　and　1.5　mm.　The　present　results　provide　theoretical　support　for　the　development　of　a　highly　efficient　flotation　separation　for　carbonate　minerals.　©　2017　Elsevier　B.V.