Hu pit tungsten ore beneficiation plant in 1955 by the Changsha Nonferrous Metallurgy Design Institute, design capacity of 250t / d, with the development of production to gradually expand the scale of 600t / d of.
(1) Ore properties: The pit-tungsten mine is a high-medium temperature hot-water filling deposit. The ore industry types are quartz large vein type wolframite and quartz fine vein impregnated type black tungsten ore. The mineral composition of the two types of ore is a polymetallic ore mainly composed of hematite. In addition to the black tungsten ore, tungsten minerals also have a small amount of scheelite . Other metal symbiotic minerals pyrite, sphalerite and a small amount of bismuthinite, Hui copper ore, galena like. Gangue minerals are quartz, feldspar, mica and white fluorite. The surrounding rocks are muscovite granite and mica quartz and phyllite. The physical properties of the ore are shown in the following table:
Raw ore physical properties
Ore type | Density, t/m 3 | Loose density, t/m 3 | Platt hardness | Humidity, % | Resting angle | Friction angle (glossy) |
Quartz large vein Quartz vein type | 2.715 2.698 | 1.61 1.57 | 12 12 | 0.75 0.85 | 38 ° 37 39 ° 47 | 25 ° 52 29 ° 24 |
The useful minerals in the ore are mostly in the form of blocks, strips, and stars scattered in the quartz veins, and there are fine veins interspersed with the inclusions, which are unevenly infiltrated by the thickness. The grade of the veins is rich and poor, with rich middle and poor side. With the deepening of the mining development project, the grade of the ore is becoming more and more poor, and the granularity of the useful mineral inlay is fine. The black tungsten ore is a plate crystal with a long axis of 10 mm, generally 1 mm. The ore is usually completely dissociated at 0.1 mm. Pyrite is mostly cubic crystal, and the particle size is generally 0.1~1.0mm.
The multi-element analysis of raw ore is shown in the table below
Multi-element analysis of raw ore
Element name | WO 3 | Sn | Zn | Cu | As | Mo | Fe 2 O 3 | CaO | MnO | SiO 2 |
Content, % | 0.56 | 0.05 | 0.25 | 0.008 | 0.02 | 0.007 | 2.93 | 0.38 | 0.185 | 84.33 |
(2) Process flow:
1) Ore crushing and hand selection: the original ore is broken into three sections and one closed circuit.
The maximum particle size of the ore selected is 400mm. The top of the original mine silo has no grid to control the large block, and the individual oversized pieces are broken by artificial hammer to less than 300mm. After the raw ore is coarsely crushed, it is washed with a vibrating sieve and classified. Quartz large vein type ore, its gangue and surrounding rock color are easy to distinguish, which is conducive to hand selection, so the use of three-level hand selection, namely: coarse, medium two-stage selection with backhand, fine-grain grade with positive hand selection. Quartz fine vein type ore, its gangue and surrounding rock are not easy to identify, and the gangue and surrounding rock interpenetrate, it is difficult to dissociate, which is not conducive to hand selection, usually only one level forehand selection. The qualified ore selected by hand is sequentially subjected to medium and fine crushing, and the final crushing particle size is 12~0 mm.
2) Re-election: According to the characteristics of the two types of ore, the re-election process adopts coarse subdivision grinding, multi-stage grinding, rich and poor sorting, coarse-grained shaker tailings re-grinding and re-election.
The qualified ore is first divided into three stages by double-layer vibrating screen and separately jigging. The coarse and medium-sized two-stage tailing tailings are respectively rod-grinded, and then jigging after grinding. The tailings that are jigging after the coarse-grained grinding are returned to the double-layer vibrating screen to form a closed circuit with the grinding machine. The tailings that are jigging after the grinding of the medium-sized spinning rods are fed into a single-layer vibrating screen (the sieve hole is 1.6 mm), which is larger than 1.6 mm and returns to the medium-sized rod mill, and is less than 1.6 mm to send the hydraulic classifier. The qualified mine is sieved into a fine-grain jig after the double-layer vibrating screen, and the jigging tailings are combined with the above-mentioned less than 1.6mm jigging tailings into the hydraulic classifier. The hydraulic classifier is divided into five grades, which are sent to the five-stage shaker for sorting. The mines of the first to fourth grades of the second shaker are respectively ground by two billiard mills, and then graded and sent to the shaker for sorting.
The coarse concentrates selected by the jigging and shaker are separated and enriched. The original slime is sorted by a shaker, and the secondary slime is sorted by a flotation-shaker.
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