X-ray fluorescence spectrometer Compass300 molten sample preparation for determination of tungsten in tungsten carbide and its waste

X-ray fluorescence spectrometer Compass300 molten sample preparation for determination of tungsten in tungsten carbide and its waste

Tungsten carbide are widely used in cemented carbide production materials, the relationship between the content of tungsten carbide and the performance of the goods and settlement, the production process by reason of the matching error, grinding also produces large quantities of waste containing tungsten, from waste recycling tungsten can make up for the inadequacy of tungsten resources, therefore determination of tungsten in tungsten carbide and its waste is of great significance. The tungsten content in tungsten carbide usually reference to national standards of the determination of cinchonine weight method, the accuracy is higher, but applies only to detect the contents of tungsten trioxide is more than 50% of the samples, and process trival, big workload. We according to the characteristics of the tungsten carbide oxidation at high temperature tungsten trioxide, tungsten carbide can be converted to the molten sample preparation – X-ray fluorescence spectrum (XRF) – EDX9000B tungsten content measuring method. First the tungsten carbide in the muffle furnace burning to tungsten completely into tungsten trioxide, add tantalum pentoxide as internal standard, sodium tetraborate – lithium tetraborate for mixed solvent, sample melting made under 1150 ℃, using XRF method for determining the content of tungsten. The results showed that the optimum calcination temperature is 800 ℃, the temperature of tungsten carbide completely into tungsten trioxide, effectively solves the difficulties of the tungsten carbide molten sample preparation; Precision (RSD) was 0.2% (6), the determination of actual samples values and national standard method (cinchonine weight method), the range of measuring content of tungsten trioxide for 6 ~ 30% and 100%, and shorten the analysis time, can meet a lot of actual samples tested