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See Chinese contents: GB/T 1873-1995 GB/T 1873-1995: Phosphate rock and concentrate. Determination of silicon dioxide content. Gravimetric and volumetric methods
This Standard specifies the determination of silicon dioxide content by perchloric acid dehydration gravimetric method. This Standard applies to the determination of silicon dioxide content that is greater than 1 % in phosphate rock and concentrate products.
