Abstract: A low grade scheelite from Jiangxi has 0.20% WO3， and its mineral compositions is complex. The major species of metallic ores include scheelite， pyrrhotite and so on， and the non-metallic ores include fluorite， quartz， tremolite， talc， phlogopite， biotite， muscovite， garnet， feldspar， sericite， calcite and so on. A large proportion of calcium-bearing gangue closely associated with scheelite. In order to determine a high efficiency mineral processing technology， beneficiation experiments were carried out. The results showed that when the grinding fineness is -0.074 mm accounted 65%， NaCO3 was used as adjusting agent， sodium silicate and tannin extracts as the combined depressor， and 731 as collector， the raw ore was tackled by a desulfurization flotation and tungsten preconcentration including one roughing， two cleanings， and one scavenging flotation to obtain the rough concentrate. After intensifying mixing by sodium silicate， the rough concentrate was tackled by one roughing， two cleanings and one scavenging flotation at normal temperature to obtain tungsten rough concentrate. The tungsten rough concentrate was mixed again with sodium silicate at 90 ℃ and tackled by one roughing， five cleanings， one scavenging flotation， and finally， tungsten concentrate with WO3 grade of 50.23% and recovery of 70.32% was obtained， which efficiently recovered the scheelite.

Key words: Scheelite, Desulfurization flotation, Flotation at ambient temperature, Heating flotation, Mixing with sodium silicate