ASTM E247-21 PDF

Full title and description

Standard Test Method for Determination of Silica in Manganese Ores, Iron Ores, and Related Materials by Gravimetry — designation ASTM E247‑21. This standard specifies a gravimetric analytical procedure for determining silica (SiO2) content in iron and manganese ores and related materials and is intended for use in laboratory quality control and compliance testing.

Abstract

ASTM E247‑21 describes a wet-chemical, gravimetric method whereby silica is separated and weighed as a stable residue to determine percent silica in samples of iron ores, iron ore concentrates and agglomerates, and manganese ores. The method is written for routine compositional analysis in the approximate range of 0.5 % to 15 % SiO2 and includes required apparatus, reagents, and notes on interferences and quality control.

General information

• Status: Active / Published standard (E247‑21).
• Publication date: 1 October 2021 (designation E247‑21).
• Publisher: ASTM International.
• ICS / categories: Analytical chemistry for ores — typical ICS codes include 73.060.10 (Iron ores) and 73.060.20 (Manganese ores).
• Edition / version: E247‑21 (current edition approved October 1, 2021).
• Number of pages: 4 (document summary / concise test method).

Scope

This test method covers the determination of silica in iron ores, iron ore concentrates and agglomerates, and manganese ore in the concentration range from about 0.5 % to 15 % SiO2. The standard is intended for use where gravimetric determination of silica is appropriate and assumes performance in a properly equipped laboratory using reagent‑grade chemicals and appropriate quality control practices.

Key topics and requirements

• Gravimetric separation and weighing of silica residues as the principal analytical technique.
• Applicable sample types: iron ores, iron ore concentrates, agglomerates, and manganese ores.
• Concentration range coverage: approximately 0.5 % to 15 % SiO2.
• Specified apparatus and materials (examples in the method include zirconium crucibles and platinum filter cones, reagent‑grade chemicals).
• Notes on interferences (method is written for ores containing less than about 0.25 % fluorine and identifies typical noninterfering elements).
• Reference to quality control practices such as Guide E882 and interlaboratory precision considerations (references to related ASTM practices and guides).

Typical use and users

Used by analytical and quality‑control laboratories in mining and mineral processing companies, ore concentrators, metallurgical laboratories, and testing organizations that require measurement of silica in iron and manganese ores for product specification, process control, and trade/compliance purposes. Technically trained analysts familiar with gravimetric techniques perform the procedure.

Related standards

ASTM E247‑21 references and aligns with other ASTM analytical and sampling standards used in ores analysis, including practices and guides such as E877 (sampling/sample preparation for iron ores), E882 (quality control in chemical analysis), E135 (terminology relating to analytical chemistry), and E691 (interlaboratory precision). Users should consult those documents for sampling and precision context.

Keywords

silica; SiO2; gravimetric; iron ore; manganese ore; analytical chemistry; ores; concentrates; agglomerates; ASTM E247; gravimetry.

FAQ

Q: What is this standard?

A: ASTM E247‑21 is the Standard Test Method for Determination of Silica in Manganese Ores, Iron Ores, and Related Materials by Gravimetry; it provides a gravimetric procedure to determine percent silica in those materials.

Q: What does it cover?

A: It covers preparation, reagents, apparatus, procedure, and considerations for gravimetric determination of silica in iron and manganese ores in the approximate range of 0.5 % to 15 % SiO2, including notes on possible interferences and recommended quality control practices.

Q: Who typically uses it?

A: Analytical chemists, laboratory technicians, quality control personnel, and testing laboratories in the mining, ore processing, and metallurgical industries use this method for product specification and process control.

Q: Is it current or superseded?

A: The E247‑21 edition was approved and published on October 1, 2021 and is the current edition as of that publication; work items to revise standards are periodically opened, so users should confirm the status with ASTM for any subsequent revisions.

Q: Is it part of a series?

A: Yes. E247 is one of several ASTM methods and practices under Committee E01 for Analytical Chemistry for Metals, Ores, and Related Materials and is commonly used alongside related sampling and analytical standards (for example E877, E882, E691).

Q: What are the key keywords?

A: Key terms include silica, SiO2, gravimetric determination, iron ore, manganese ore, analytical chemistry, concentrates, and ASTM E247.