ASTM E247-01 Determination of Silica in Manganese Ores, Iron Ores, and Related Materials

ASTM E247-01 Determination of Silica in Manganese Ores, Iron Ores, and Related Materials

The estimation of silica content in manganese ores, iron ores and other such materials is done using the ASTM E247-01 standard test method. This method uses gravimetric analysis, which is a laboratory technique that uses change in mass to calculate the amount or concentration of an analyte.


    ASTM E247-01 standard method describes the procedure to utilize gravimetry for estimating silica composition. Silica content of iron ores, iron ore concentrates and agglomerates, and manganese ores can be determined using this test method. Materials analysed have silica concentration in the range 0.5 to 15%. This test method is intended to be used for compliance with compositional specifications for silica content.

    Test procedure:

    The sample is fused with sodium peroxide in a zirconium crucible. The melt is leached with water and dissolved in hydrochloric acid. Silica is separated by double dehydration with perchloric acid. The two precipitates formed are combined, ignited, and weighed. The silica is volatilized by treatment with hydrofluoric and sulfuric acids and the residue is weighed.

    Specimen size:

    The sample weight is taken as follows,

    Content of Silica, %Weight of Test Sample, g
    Less than 21.0
    2 and over0.5


    Calculate the percentage of silica as follows,


    A = silica in test sample, g,

    B = silica in blank, g, and

    C = test sample weight, g.


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