Sodium polytingstate are also known as sodium metatungstat. Its physical properties are as follows: chemical formula: Na6O39W12, molecular weight: 2968, density: 3.1g/cm3, CB number: CB1128947, CAS number: 12141-67-2.
Sodium Polytingstate because of its high density, non-toxic, easy preparation and can be recycled and other advantages so it has been widely use in many areas. For example sodium polytingstate wildly use in density separation research area of geology, soil science and marine biology. In geology it is mainly used in separation minerals and sedimentary rocks, for the separation of micro-fine pure minerals providing a new way. In soil science it is mainly used in separate large particles of soil aggregates, organic matter and humic acid and so on. In marine biology and is mainly used in the separation of ancient microbial and organic matter. On the other hand, using sodium polytingstate solution to density separation the operation is simple and the effect is stable. What’s more it not changes the physical and chemical properties of substances to be separated.

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Lianhuashan deposit, the first porphyry-type tungsten deposit ever discovered in China, is located in the east of Guangdong Province. Stratigraphically only Jurassic Xiaoping coal series and acidic volcanic rocks occur in the mining area with the latter unconformably overlying the former. Biotite granite, quartz-porphyry and quartz diorite-porphyrite constitute the major intrusives. Rb-Sr isochron ages of the volcanic rocks and the granite are 135.8 ±2.5 m. y. and 137.2± 2.5 m.y. respectively, indicating that they are products of the identical magmatic activity. K-Ar apparent ages vary between 76.6 m.y. and 119.5 m.y. with the K~(40)-Ar~(40) isochron age of volcanic rocks determined at 120.4±12.1 m.y. These ages are as a rule younger than the corresponding Rb-Sr ages. The formation of ferberite-bearing greisen represents the first stage of tungsten mineralization. The K-Ar age of its muscovite is 119.5 m.y., denoting the coincidence of the tungsten mineralization with the igneous rocks in their formation time. The younger K-Ar apparent ages of samples from this area might be chiefly attributed to the effect of the late stage thermal events in the mega-metallogenic belt around the Pacific Ocean. The stable isotope measurements give the following δS~(34)(‰) values:pyrrhotite, from -0.05 to + 3.14;pyrite, from -0.85 to + 3.3; total sulfur(δS_(ΣS)~(34)), 2.0, suggesting that sulfur in the deposits came from deep sources. Initial ratios of Sr isotopes for volcanic rocks and granitic rocks are 0.7061 ±0.0004 and 0.7069 ±0.006 respectively, showing that, in addition of occurring in the same period, they were derived from the same sources. The materials for igneous rocks and tungsten deposits were probably formed as a result of the melting of the oceanic plate along the subduction zone.

 

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Simulation and Analysis on Flow Field in Leaching Tank With Dual-impeller for Alkali Cooking Tungsten Ore

Computational fluid dynamics method was applied to study three-dimensional flow field in leaching tank with JH type axial impeller and straight blade impeller.The velocity field,pressure field and turbulent kinetic energy field in leaching tank were analysized rotating at constant speed of 300 r/min and taking the fluid of sodium hydroxide mixed with tungsten ore as simulation object by using the multi-reference frame(MRF) and standard k-ε turbulent model.The research provided scientific basis for structure optimization design of leaching tank.

 

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The most extensive magma activity and mineralization in Shirenzhang zone occurred in Yanshan Period,which is also the most important mineralization term in East China.The magma activity and mineralization of Shirenzhang region in Yanshan geological period must be restricted by the bigger tectonic environment of East China.In another word,the magma activity and mineralization of Shirenzhang zone in Yanshan period is a reflection of magma activity and mineralization of Shirenzhang zone in East China.This paper tries to talk about the tectonic-magma-mineralization of Shirenzhang zone in a bigger environment of East China.

 

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