This International Standard specifies a reduced molybdo-silicate spectrophotometric method for the determination of the silica content of aluminium oxide primarily used for the production of aluminium.
The method is applicable to products having an SiO2 content between 0,005 and 0,025 % (m/m), provided that the content of (P2O5 + V2O5) does not exceed 0,02% (m/m).
1 Special cases
1.1 SiO2 content between 0,025 and 0,25%(m/m)[(P2O5+V2O5)content not exceeding 0,02%(m/m)].
1.2(P2O5+V2O5)content exceeding 0,02%(m/m)(under study).