ASTM E247-21 PDF

Overview

ASTM E247-21 is the internationally recognized standard test method for the determination of silica in manganese ores, iron ores, iron ore concentrates, agglomerates, and related materials using gravimetric analysis. Developed by ASTM International, this standard provides detailed procedures for accurately measuring silica content within the range of 0.5% to 15%. Laboratories implementing ASTM E247-21 ensure the quality, compliance, and consistency of materials used in various metallurgical processes by accurately determining silica levels.

Key Topics

• Scope:

  • Applicable to iron ores, manganese ores, concentrates, and agglomerates.
  • Determines silica content from 0.5% to 15%.
  • Specifies the use of SI units exclusively.

• Test Method Summary:

  • Involves fusion of the sample with sodium peroxide in a zirconium crucible.
  • Silica is separated via precipitation and quantification through gravimetric analysis.
  • The analytical sequence includes controlled heating, leaching, filtration, ignition, and volatilization, resulting in precise silica measurement.

• Quality Control:

  • Emphasizes the necessity for skilled laboratory analysts and a properly equipped laboratory environment.
  • Requires appropriate quality assurance protocols, such as those outlined in ASTM Guide E882.
  • Calls for safe waste disposal, as well as adherence to relevant safety, health, and environmental regulations.

• Precision and Bias:

  • Results have been validated using certified reference materials, ensuring accuracy and reliability.
  • Interlaboratory studies inform the precision but note that specific repeatability and reproducibility projections are not included due to the scope of data.

• Interferences:

  • The method is proven effective for most iron and manganese ores with low fluorine content (