Lower tungsten content in the crust, abundance of 1. 3ppm. Tungsten in nature, mainly hexavalent cations were present. Because hexavalent cation radius is small, the price is high, with strong polarization, and easy formation of complex anion, the tungsten mainly [WO4] 2 -, and the solution Fe2 +, Mn2 +, Ca2 + and other cations to form tungstate - wolframite scheelite ore or precipitation. In the supergene effect, due to a more stable tungsten Manganese Ore Crushing Equipment minerals, often forming placer. However, under acidic conditions, the tungsten-containing minerals can be decomposed and dissolved in the form of surface water, WO3, sometimes forming tungsten secondary minerals. Sometimes in the form of mineral particles or ions are adsorbed clay or iron and manganese oxides concentration in the shale, fine-grained sandstone and shale seams in iron and manganese. In the mineralization process with [WO4] 2 - cation binding only a few, mainly Ca, Fe, Mn, Pb divalent ions, followed by Cu, Zn, Al, Fe, Y and other trivalent ions, therefore mineral species is limited.
China has proven tungsten deposits are mainly distributed in the Nanling region, Jiangxi, Hunan and Guangdong which is most important. In recent years, the North Qilian - Beishan area discovered a large tungsten deposit, changing the distribution pattern of China's industrial tungsten Molybdenum Ore Crushing Process Equipment deposit. At present, the Chinese tungsten ore reserves in the world, as more than 30 countries total foreign reserves (1. 3 million tons) more than three times. But China rich tungsten deposits (WO3 containing more than 0. 5 % or 1%) is not much, mostly the poor refractory deposits. Another major tungsten producing countries are Canada and the united states. Chen County, Hunan Province, China Shizhuyuan is a " non-ferrous metal museum world, " with more than 140 kinds of minerals, including tungsten ore reserves currently account for a quarter of the world's total...