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ISO 11258:2015 Iron ores for shaft direct-reduction feedstocks - Determination of the reducibility index, final degree of reduction and degree of metallization >
ISO 11258:2015 Iron ores for shaft direct-reduction feedstocks - Determination of the reducibility index, final degree of reduction and degree of metallization, 2015
- 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
- 8.4 Chemical analysis after reduction
- 9 Expression of results
- 9.1 Calculation of the final degree of reduction (R90)
- 9.2 Calculation of the reducibility indices dR/dt(R=40) and dR/dt(R=90)
- 9.2.1 Reduction curve
- 9.2.2 Reducibility index for 40 % reduction
- 9.2.3 Reducibility index for 90 % reduction
- 9.3 Calculation of the degree of metallization (M)
- 9.3.1 Determination of the degree of metallization from chemical analysis (M)
- 9.3.2 Determination of the degree of metallization from R90 (MR)
- 9.4 Repeatability for R90 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 formula for reducibility
- Annex C (informative) Derivation of formula for degree of metallization from R90
- Bibliography [Go to Page]