Determination of Silicon Content in Discharged Silicon Powder by ICP-OES
In the cold hydrogenation process of polycrystalline silicon,partially reacted silicon powder is discharged,which is called discharged silicon powder.The discharged silicon powder contains some partially unreacted silicon,and its content needs to be accurately detected to facilitate the recycling and utilization of downstream manufacturers.Use hydrofluoric acid and nitric acid to digest the discharged silicon powder,and use ICP-OES to detect the silicon content in the digestion solution.The silicon content in different batches of discharged silicon powder samples was tested,and the test results showed RSD＜0.5％,with a spiked recovery rate of 95.1％～104.3％.Compared to the traditional potassium fluorosilicate volumetric method,ICP-OES is simpler and easier to operate,providing a reference for detecting the effective silicon content in discharged silicon powder.
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