Abstract: Waterglass is used as inhibitors in scheelite flotation. The effects of waterglass on the flotation be - haviors of three typical calcium minerals were studied through pure mineral flotation tests, providing some theoretical basis for the use of waterglass as inhibitors in practice. The results showed that waterglass could depress these three typical calcium minerals selectively with the order: fluorite＞calcite＞scheelite. In the closed circuit flotation flowsheet with OXB functions as collector and a scheelite ore of Jiangxi as the test object, scheelite concentrate grading 58.38 % was finally obtained at recovery rate of 82.10 %, which verified the re - sults of pure mineral flotation tests.