ISO 4696-1:2015
Iron ores for blast furnace feedstocks — Determination of low-temperature reduction-disintegration indices by static method — Part 1: Reduction with CO, CO2, H2 and N2
ISO 4696-1:2015 specifies a method to provide a relative measure for evaluating the degree of size degradation of iron ores when reduced with carbon monoxide, carbon dioxide, hydrogen, and nitrogen, under conditions resembling those prevailing in the low-temperature reduction zone of a blast furnace.
ISO 4696-1:2015 is applicable to lump ores, 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 Reduction
8.3 Tumbling
8.4 Sieving
9 Expression of results
9.1 Calculation of the reduction-disintegration indices (RDI−1+6,3, RDI−1−3,15, RDI−1−0,5)
9.2 Repeatability and acceptance of test results
10 Test report
11 Verification
Annex A (normative) Flowsheet of the procedure for the acceptance of test results
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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 Reduction
8.3 Tumbling
8.4 Sieving
9 Expression of results
9.1 Calculation of the reduction-disintegration indices (RDI−1+6,3, RDI−1−3,15, RDI−1−0,5)
9.2 Repeatability and acceptance of test results
10 Test report
11 Verification
Annex A (normative) Flowsheet of the procedure for the acceptance of test results