Tungsten fine mud usually refers to the slime of -0.03mm grain size, and the sorting effect is not ideal only by re-election or flotation. The difference in specific gravity between tungsten ore and gangue minerals is theoretically suitable for re-election separation. However, in the slurry two-phase system, the sedimentation of the particles is not only related to the specific gravity, but also related to the particle size and shape of the particles. When the ore size of the ore is less than 0.03 mm, the sedimentation speed of the fine ore is slow, which makes it difficult to recover the fine ore in the re-election in production. With the continuous improvement and improvement of the beneficiation process, in recent years, a combined process of combining various mineral processing methods such as heavy, magnetic and floating has been gradually formed. There are re-election pre-enrichment-flotation-re-election and strong magnetic separation- Flotation process, etc. Because the fineness of tungsten fine mud is too fine, it is difficult to sort. According to the nature of the fine mud raw materials in the mine, each mine has strengthened the beneficiation test research work, carried out process improvement, and achieved certain results in improving the fine mud recovery rate, but the overall recovery rate of tungsten fine mud is still low. The following were introduced reselection Plant Primary and Secondary Slimes beneficiation technology selection and a black scheelite concentrate tungsten fine mud separation technology. 1) New technology for re-election plant tungsten fines beneficiation Luo pit row, down the mountain, the mountain ridge iron ore mines and other coarse fraction using a tungsten recovery reselection, Primary and Secondary Slimes which is preferably recovered. The process flow is explained separately: A. Row Luokeng tungsten ore tungsten fine mud In view of the wide variety of tungsten fine mud minerals in the Luokeng tungsten ore, the tungsten grade is low, the black tungsten ore and scheelite are mixed, and the proportion of primary ore and weathering ore changes greatly. The fine mud pretreatment-normal temperature flotation-centrifugation is adopted. Machine re-election process (Fig. 1), treatment of WO3 0.19% tungsten fine mud, using pre-separation technology, the flotation concentrate grade increased from the original WO3 2% to WO3 6-8%, the operation recovery rate of 80 ~ 85%; The centrifugal ore dressing machine is used to treat the flotation coarse concentrate, which greatly increases the recovery rate of tungsten fine mud, and the recovery rate of the operation is as high as 75-80%. Finally, when the tungsten fine sanding WO3 0.19%, the concentrate grade WO3 is more than 20%, and the total recovery is more than 65%. B. Dajishan tungsten fine mud The daily ore processed by Dajishan is 2200~2500 tons, and the original secondary fine mud produced daily is 400~500 tons, accounting for 7~8% of the original ore metal content, and the grade WO3 is 0.1~0.3%. The black tungsten ore in the Dajishan tungsten fine mud: the ratio of scheelite is about 1:1, and the recoverable metal minerals are hematite and scheelite, and a very small amount of molybdenite and stibnite . Gangue minerals as quartz, mica and white followed biotite, a small amount of chlorite, tourmaline. The “re-selection pretreatment-flotation-re-election†beneficiation process (see Figure 2), the average grade of the industrial test conducted in June-July 2010 was WO30.30%, and the tungsten concentrate grade WO3 was obtained. 51.14%, WO3 recovery rate of 65.33%. C. Tieshan 垅 tungsten fine mud Primary and Secondary Slimes original mineral ore accounted Tieshanlong of 7 ~ 9%, - 0.074mm 80%, the grade was about 0.35% WO3, metallic minerals mainly wolframite, scheelite contain minor amounts, brass pyrite, bismuthinite, cassiterite, sphalerite, etc., using "sweetening - centrifuge - flotation - magnetic separation" process (FIG. 3), the tungsten concentrate grade of 60% or more, 65% recovery about. Through strong magnetic separation, the tin grade in the strong magnetic tailings is enriched to 4.9% or more. Figure 3 Tieshan 垅 fine mud operation process flow chart 2) New technology for selective separation of tungsten fines beneficiation The recoverable metal minerals in Shizhuyuan tungsten fine mud include wolframite, scheelite and cassiterite. Black tungsten deposits in black tungsten: The ratio of scheelite is about 9:1. Adopting the "strong magnetic separation-flotation" process flow (Fig. 4), the statistical indicators for 7 consecutive days in May 2011: 1.77% WO3 heated flotation tailings, obtained black tungsten concentrate grade 35.90% WO3, recovery rate At 21.99%, the recovery rate is 8% higher than the original full float process. The fine mud recovery process in some mines is not perfect, and the associated metal elements in the fine mud are not effectively recovered. For example, the drifting tungsten ore is recovered by a single re-election method. The fine mud is concentrated and classified, and the various grades are entered into the grooved shaker to be sorted and sorted. The tailings are selected by the fleece chute. Shaker selection. The metal recovery rates of molybdenum, copper, lead and zinc in the fine mud section shaker concentrate are 8.40%, 18.56%, 38.53%, 22.74%, and 60%-80% of tungsten, copper, lead and zinc metal in tungsten fine mud. Both are lost in the tailings. 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Fine mud treatment in tungsten ore beneficiation
Fine mud treatment alone is featured China tungsten tin beneficiation plant. Wolframite brittle, easily over crushed, according to statistics, the number of fine mud and the metal content is generally 11% to 14% of the hole ore, 3% to 8% of the total recovery of fine mud recovery of [82 ]. Effectively improving the recovery rate of fine mud is essential for improving the comprehensive recovery rate of tungsten and the comprehensive recovery of valuable metals and the economic benefits of mines.