Tungsten belongs to the rare element in the earth's crust containing only 0.007% of China's tungsten reserves of about 55% of the world's total reserves in the first place. North, northwest and southwest have output, especially in the west, Guangxi, Hunan, Guangdong, Jiangxi, Fujian, east Nanling Mountains area, tungsten ore. Among them, the southern part of Jiangxi most concentrated, the size of mine, hundreds of down Mountain, West Mountain, Kui, Pangushan are renowned for tungsten mines.
China's the smelt tungsten mineral raw materials with foreign foreign long-term development of tungsten ore is scheelite, 60% of the total production capacity. In China, scheelite has proved reserves of 3.76 million tons, accounting for 71% of the total reserves of tungsten ore, but due to some large, very large deposits of tungsten ore material composition is complex, disseminated fine grain size, smelt not yet completely resolved, and therefore at this stage mining is still the quartz vein-type wolframite, accounting for 90% of the national recovery of ore.
The wolframite tungsten is a lithophile elements present in the pegmatite and hydrothermal deposits, mainly in the form of tungstate; known about 15 kinds of tungsten ore, which is and scheelite mine two kinds.
(1) wolframite (Fe, Mn) WO4, also known as tungsten manganese iron ore, containing WO3 about 76%, showed a brownish black to black, which was semi-metallic luster, specific gravity of 7.1 to 7.9; in the monoclinic crystal system, crystal often has thick plate, the crystal planes often have vertical stripes. The wolframite often symbiosis together with quartz veins.
(2) scheelite CaWO4, also known as tungsten calcium ore, containing WO3 about 80%, often off-white, sometimes slightly yellow, purple, light brown and other colors, was adamantine luster or oil sheen, the proportion of 5.9 to 6.1; tetragonal crystal form often has dual cone, a collection of mostly irregular granular or dense block. Scheelite often symbiosis with molybdenite, galena and sphalerite.
known tungsten-containing ore quartz - wolframite ore, skarn - scheelite ore and placer deposits and other types.
tungsten concentrates is the production of tungsten iron, sodium tungstate, ammonium paratungstate (APT), the main raw material of the tungsten compounds of ammonium metatungstate (AMT), its downstream products of tungsten trioxide, blue tungsten oxide, tungsten powder, tungsten carbide, tungsten carbide, tungsten carbide, tungsten, tungsten, etc.
4. Production Process
beneficiation process of tungsten concentrate by tungsten ore (wolframite or scheelite) by crushing, milling, re-election (mainly shaker jig), flotation, electrostatic separation, magnetic separation process to produce the wolframite or scheelite concentrate to meet the national standard, the main ingredient of tungsten concentrates of tungsten trioxide content above 65%.
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