Abstract: A sulfur skarn tungsten ore resources in Hunan owns complex composition,and the main useful minerals are scheelite and fluorite.In order to high efficiently develop and utilize the ore,beneficiation tests on the ore were carried out.The results showed that under the case that silicate with modulus of 2.8 is mixed with scheelite concentrate 1 with pulp density of 50% for 1.5 h,and through four cleanings flotation at room temperature,the WO₃ grade of scheelite was effectively improved.Under the grinding fineness of -0.074 mm 80%,sulfure was removed through one open circuit flotation.Scheelite concentrate from the desulfurized product was achieved through the closed-circuit process of one roughing,two scavenging,five cleaning and middles back to the flow-sheet in order.Fluorite was obtained from tailings above through closed circuit process of one roughing,two scavenging,five cleaning and middles back to the flow-sheet in order.Finally,scheelite concentrate with WO₃ grade of 58.26% and WO₃ recovery of 92.89%,and fluorite concentrate with CaF₂ grade of 98.36% and recovery of 89.85% were achieved respectively.The closed-circuit process realized a low-consumption and high-efficiency recovery of the ore.

Key words: Scheelite, Fluorite, Sodium silicate, Cleaning flotation at room temperature, Desliming