Tungsten Granule

Tungsten granule, also known as tungsten flux, the color is bright gray and the appearance is polyhedral particles. Besides, the particle size is about 20-40 mesh, high purity, which can up to 99.95% or more, so it is also known as pure tungsten flux. It is made of metal tungsten processed to the small particles, because it has a good flux effect and in the analyzer the measured results are very stable, which is widely used. The main purpose is as flux used in infrared carbon and sulfur analyzers. Tungsten granule used for the infrared carbon and sulfur oxides analysis, which helps to reduce the melting point of combustion products and promote the release of carbon and sulfur. The principle is as follows: tungsten is easily oxidized, to pass oxygen at 650 ℃ the tungsten will be oxidized and can release a lot of heat, with a high heat value, fast response characteristics. Oxygenated product tungsten trioxide is an acidic oxide with loose volume, so it is conducive to release CO₂ and SO₂ and will not cover on the sample. Tungsten trioxide above 900 ℃will significantly sublimation. Due to the escape of tungsten trioxide, to increase the diffusion rate of carbon and sulfur, the sample can fully oxidize. In addition, the volatilized tungsten trioxide after leaving the molten pool, at 700 ~ 800 ℃ turns into a solid phase, covered on Fe₂O₃ where in the pipeline to prevent sulfur adsorption of pipeline. And tungsten baseline value is very low, can be used for low carbon and low sulfur determination.

Tungsten billet and tungsten powder can both as raw materials for tungsten flux production. Tungsten billets are mainly uses tungsten (broken) head. Tungsten billet is generally used for the production of tungsten wire, mixed with trace elements aluminum, silicon, potassium, volatile high. In addition, can also directly used FW-1 tungsten powder for tungsten flux manufacturing, and the flux performance is than tungsten billet produced flux. Besides, carbon and sulfur baseline value is low, less volatile, but the high cost of raw materials.

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