Study On High-efficiency Recovery Of A Weathered Scheelite Slime

Scheelite is mostly fine disseminated, easily mudding, it’s surface contamination easily by fine gangue minerals and lose their flotability. At the same time, scheelite produce large amounts of scheelite fine mud after weathering, further increases the difficulty of dressing, resulting in fine-grained scheelite recovery very difficult. Strengthen the comprehensive recovery of micro-fine scheelite is an effective and rational use of resources scheelite important way.Based on a weatherded scheelite mud as the research object, carried out on the ore particle size analysis, chemical elemental analysis, chemical phase analysis and mineral composition analysis. Depending on the nature of the ore, were pure mineral test, study the effects of different collectors and modifiers for mineral flotability. Then depend on conclusions of pure mineral tests, conducted on actual mineral flotation research, determind the optimum grinding fineness, flotation reagent system and flotation process. Finally, studies the enhanced flotation, strengthen stir, carrier flotation and multi-fluid process intensification flotation column were integrated used to improve the recovery of fine mud.According to the conclusions of pure mineral test, conducted ore flotation machine for conventional flotation studies by flotation machine, Determined the roughing feeding fineness of-0.074 mm is 80%, flotation pulp density of 35%, reagent system for roughing process: sodium is 2000g/t, sodium silicate is 2000g/t, collector ZL is 300g/t, lead nitrate is 1000g/t. At this point, rough tungsten concentrate grade of 3.85% and a recovery of 55.08%. Through process test, and ultimately chose "one-roughing two-concentrating three-sweeping" process, and made a closed process test, and ultimately the WO3 grade of 12.62%, WO3 recovery of 56.31% of tungsten concentrates.Using laboratory cyclone micro-bubble flotation column processing scheelite fine mud by one-roughing process, using the same reagent system as flotation machine flotation, crude concentrate grade obtained was 5.71%, WO3 recovery rate of 63.16 %. Due to the low rate of concentrate, so uses flotation machine concentration, developed a "one-roughing one-concentrating one-sweeping" process. Finally, determined the "flotation machine concentrating and flotation column one-roughing one-sweeping " column machine joint process, then carried out open and closed trials, ultimately, tungsten concentrate grade of 12.38% of the final recovery of WO3 63.95%. By contrast with flotation machine "one-roughing two-concentrating three-sweeping" process, WO3 grade fairly similar, but the recovery rate improved 7.64 percentage points.By contrast size analysis, the WO3 distribution of the flotation column flotation tailings fine fraction(-38μm) is 7.14 percentage points lower than in flotation machine flotation tailings, indicating flotation column for fine scheelite flotation is better. Contrast with flotation machine, flotation column has a larger comparative advantage on fine grade scheelite flotation. So column flotation recovery of fine-grained scheelite resources is important, weathered scheelite slime was high-efficiency recoveried.