GOST 26482-90 PDF

Full title and description

GOST 26482-90 — Previously reduced iron ores, concentrates, agglomerates and pellets. Method for the determination of metallic iron. (Russian title: Руды железные, концентраты, агломераты и окатыши предварительно восстановленные. Метод определения металлического железа.)

Abstract

This standard specifies a titrimetric laboratory method for determining the mass fraction of metallic iron in previously reduced iron ores, concentrates, agglomerates and pellets. The method covers metallic iron content from about 1 % up to about 95 % and is intended for routine chemical analysis in metallurgy and ore-processing practice. The technique is based on selective dissolution of metallic iron in an acidic ferric chloride medium followed by titration of ferrous ions with a standard solution of potassium dichromate using diphenylamine-sulfonate as an indicator.

General information

• Status: In force (действует). Limitation of effectiveness removed by interstate protocol in the 1990s.
• Publication date: 1 July 1991 (introduced following approval in 1990).
• Publisher: State Standard of the USSR / Interstate standard bodies (originally issued under Gosstandart; developed by the Ministry of Metallurgy USSR).
• ICS / categories: 73.060.10 (Iron ores and concentrates); technical group A39 (metallurgy/iron ores).
• Edition / version: Original issue GOST 26482-90 (replacing GOST 26482-85).
• Number of pages: 7 pages (short laboratory procedure standard).

Scope

Applies to previously reduced (pre-reduced) iron ores, concentrates, agglomerates and pellets. Establishes a titrimetric analytical procedure for measuring metallic (elemental) iron content in the indicated materials. The standard excludes fluxed materials whose metallic-iron content is below approximately 5 %.

Key topics and requirements

• Definition of the titrimetric procedure for metallic iron determination in pre-reduced iron-bearing materials.
• Applicable concentration range: approximately 1 % to 95 % metallic iron by mass.
• Reagents and apparatus: preparation and use of ferric chloride dissolution medium (pH ≈ 1.0), potassium dichromate titrant, diphenylamine‑sulfonate indicator; requirements for acids and standard solutions.
• Sample preparation and weighing (air‑drying / drying conditions and sample mass limits for high-iron materials).
• Detailed titration and control‑experiment procedure, calculation of results and acceptance limits for repeatability and reproducibility.
• Limits on analytical uncertainty and instructions for re-analysis when precision criteria are not met.

Typical use and users

Used by metallurgical and mineral analysis laboratories, quality control units at mining and pelletizing plants, ore beneficiation facilities, research laboratories in metallurgy and materials testing organizations. Typical applications include routine quality checks of reduced ore products, acceptance testing, process control during pelletizing and direct-reduced iron production, and laboratory comparative analyses.

Related standards

Commonly used together with general analytical standards and reagent specifications such as GOST guidance for analytical method performance (e.g., GOST 23581 series), and standards for reagents (hydrochloric, sulfuric and orthophosphoric acids) and reference materials. It replaced GOST 26482-85 and has connections to relevant metallurgical testing standards and inter-state harmonized documents.

Keywords

metallic iron determination, titration, potassium dichromate, ferric chloride dissolution, reduced iron ores, concentrates, agglomerates, pellets, analytical method, metallurgy, quality control

FAQ

Q: What is this standard?

A: GOST 26482-90 is a laboratory standard that defines a titrimetric method for determining the mass fraction of metallic (elemental) iron in previously reduced iron ores, concentrates, agglomerates and pellets.

Q: What does it cover?

A: It covers sample preparation, reagents and apparatus, the selective dissolution of metallic iron in an acidic ferric chloride medium, titration of the resulting ferrous iron with potassium dichromate, calculation of results, and quality/precision requirements. The method is applicable for metallic-iron contents roughly between 1 % and 95 % and excludes certain fluxed materials with very low metallic-iron content.

Q: Who typically uses it?

A: Analytical chemists and laboratory technicians in mining, pelletizing and iron‑making enterprises, process-control and quality-assurance personnel, and R&D laboratories in metallurgy and mineral processing.

Q: Is it current or superseded?

A: The standard GOST 26482-90 is the 1990/1991 issue and has been retained in force (the original time limitation was later lifted). It replaced the earlier GOST 26482-85; users should verify national adoption or any more recent revisions or national equivalents before use in regulatory or contract work.

Q: Is it part of a series?

A: It is part of the suite of metallurgical and chemical-analysis standards addressing iron ores and concentrates and is cross-referenced with general analytical-method standards and reagent specifications. It is grouped within standards for iron ores and related testing procedures.

Q: What are the key keywords?

A: Metallic iron, reduced ores, concentrates, agglomerates, pellets, titration, potassium dichromate, ferric chloride, diphenylamine-sulfonate indicator, chemical analysis, metallurgy.