ISO 2597-2:2019
Iron ores — Determination of total iron content — Part 2: Titrimetric methods after titanium(III) chloride reduction
This document specifies two titrimetric methods, free from mercury pollution, for the determination of total iron content in iron ores, using potassium dichromate as titrant after reduction of the iron(III) by tin(II) chloride and titanium(III) chloride. The excess reductant is then oxidized by either dilute potassium dichromate (Method 1) or perchloric acid (Method 2).
Both methods are applicable to a concentration range of 30 % mass fraction to 72 % mass fraction of iron in natural iron ores, iron ore concentrates and agglomerates, including sinter products.
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
4.1 Decomposition of the test portion
4.1.1 Acid decomposition
4.1.2 Fusion-filtration
4.2 Titration of iron
5 Reagents
6 Apparatus
7 Sampling and samples
7.1 Laboratory sample
7.2 Preparation of test samples
7.2.1 General
7.2.2 Ores having significant contents of combined water or oxidizable compounds
7.2.3 Ores outside the scope of 7.2.2
8 Procedure
8.1 Number of determinations
8.2 Blank test and check test
8.3 Determination of hygroscopic moisture content
8.4 Test portion
8.5 Determination
8.5.1 Decomposition of the test portion
8.5.2 Reduction
9 Expression of results
9.1 Calculation of total iron content
9.2 General treatment of results
9.2.1 Repeatability and permissible tolerance
9.2.2 Determination of analytical result
9.2.3 Between-laboratories precision
9.2.4 Check for trueness
9.2.5 Calculation of final result
9.2.6 Oxide factors
10 Test report
Annex A (normative) Flowsheet of the procedure for the acceptance of analytical values for test samples
Annex B (normative) Procedure of Japanese weighing method
Bibliography
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
4.1 Decomposition of the test portion
4.1.1 Acid decomposition
4.1.2 Fusion-filtration
4.2 Titration of iron
5 Reagents
6 Apparatus
7 Sampling and samples
7.1 Laboratory sample
7.2 Preparation of test samples
7.2.1 General
7.2.2 Ores having significant contents of combined water or oxidizable compounds
7.2.3 Ores outside the scope of 7.2.2
8 Procedure
8.1 Number of determinations
8.2 Blank test and check test
8.3 Determination of hygroscopic moisture content
8.4 Test portion
8.5 Determination
8.5.1 Decomposition of the test portion
8.5.2 Reduction
9 Expression of results
9.1 Calculation of total iron content
9.2 General treatment of results
9.2.1 Repeatability and permissible tolerance
9.2.2 Determination of analytical result
9.2.3 Between-laboratories precision
9.2.4 Check for trueness
9.2.5 Calculation of final result
9.2.6 Oxide factors
10 Test report
Annex A (normative) Flowsheet of the procedure for the acceptance of analytical values for test samples
Annex B (normative) Procedure of Japanese weighing method
Bibliography