ISO 7215:2015
Iron ores for blast furnace feedstocks — Determination of the reducibility by the final degree of reduction index
ISO 7215:2015 specifies a method to provide a relative measure for evaluating the extent to which oxygen can be removed from iron ores when reduced under conditions resembling those prevailing in the reduction zone of a blast furnace.
ISO 7215:2015 is applicable to lump ore, sinters, and hot-bonded pellets.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Sampling, sample preparation, and preparation of test portions
5.1 Sampling and sample preparation
5.2 Preparation of test portions
6 Apparatus
6.1 General
7 Test conditions
7.1 General
7.2 Reducing gas
7.2.1 Composition
7.2.2 Purity
7.2.3 Flow rate
7.3 Heating and cooling gas
7.4 Temperature of the test portion
8 Procedure
8.1 Number of determinations for the test
8.2 Chemical analysis
8.3 Reduction
9 Expression of results
9.1 Calculation of the degree of reduction (R180)
9.2 Repeatability for R180 and acceptance of test results
10 Test report
11 Verification
Annex A (normative) Flowsheet of the procedure for the acceptance of test results
Annex B (informative) Derivation of the formula for final degree of reduction
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Sampling, sample preparation, and preparation of test portions
5.1 Sampling and sample preparation
5.2 Preparation of test portions
6 Apparatus
6.1 General
7 Test conditions
7.1 General
7.2 Reducing gas
7.2.1 Composition
7.2.2 Purity
7.2.3 Flow rate
7.3 Heating and cooling gas
7.4 Temperature of the test portion
8 Procedure
8.1 Number of determinations for the test
8.2 Chemical analysis
8.3 Reduction
9 Expression of results
9.1 Calculation of the degree of reduction (R180)
9.2 Repeatability for R180 and acceptance of test results
10 Test report
11 Verification
Annex A (normative) Flowsheet of the procedure for the acceptance of test results
Annex B (informative) Derivation of the formula for final degree of reduction