The Coupling Inductance on Tungsten Trioxide of Tungsten Ores

Tungsten is metallic element. It is steel gray or silver white; it has high hardness, high melting point, and without air erosion at room temperature. The main purposes for the manufacture are the filament and high-speed cutting steel, hard mold, and for optical instruments, chemical equipment. Tungsten primarily is a hexavalent cation in nature; its ionic radius is 0.68 × 10-10m. Since W₆ + ionic radius is small, the price is high, strong polarization capability, which is easy to form a complex anion, thus tungsten mainly in the complex anion form [WO₄] ₂-, and the solution of Fe₂ +, Mn₂ +, Ca₂ + and other cations to form wolframite or white tungsten ore precipitation. The tungsten is a shiny silver-white metal, it has high melting point and great hardness, low vapor pressure, the evaporation rate is also smaller after smelting, and its chemical properties are more stable.

The coupling inductance is the actual coupling coil abstract idealized circuit model; it is a linear time-invariant dual-port element, which consists of L₁, L₂ and M three parameters to characterize. The voltage and current relationship of the coupling inductance is the differential relation, it is a dynamic circuit elements. The coupling inductance has series in two ways - along access and reverse. A synonym, its linking is connected to terminal L₁ and L₂ [Fig. (A)], both from the dot end of the current i, flowing into the magnetic field in the same direction and reinforce each other. Reverse L₁ and L₂ is connected to the end of the same name [Fig. (B)], the current i L1 is marked from the end of the inflow from L₂ that marking the end of the outflow, weakening the magnetic field in the opposite direction to each other.

Studying the emission spectrometry method of plasma for the determination of tungsten trioxide in tungsten ores by the coupling inductance, we select the best conditions for the instrument, in order to avoid interfering the effect on the determination, using the National Standard GBW07284 as a high standard. At a wavelength of 209.4nm, 224.8nm and 239.7nm measured tungsten trioxide, the lower limit is 0.0004% and relative standard deviation is 4.0%. Analysis by the national standard material verification method is feasible; the actual results are consistent with the analysis of samples and other analytical methods.

• < Prev
• Next >