Tungsten is a rare metal as the other rare earth metals. Rare metals usually refer to metals with less content or scattered distribution in nature. Tungsten is a widely distributed element, which can be found almost everywhere in all kinds of rocks, but its content is low. The content of tungsten in the earth's crust is 0.001%, and the average content in granite is 1.5% × 10-6. This characteristic makes its extraction very difficult. Usually, it can only be separated and extracted by organic solvent extraction and ion exchange. With the progress of science and technology, the development of metallurgical technology, equipment, analysis and detection technology and the expansion of rare metal production scale, the purity, performance and variety of tungsten are continuously improved, which expands the application field of tungsten. China is rich in tungsten resources, and the total output and export of tungsten account for the first in the world.
Wolframite (Mn,Fe)WO4 ore found in nature
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