ISO 13930:2015

DRAFT INTERNATIONAL STANDARD
ISO/DIS 13930
ISO/TC 102/SC 3 Secretariat: ABNT
Voting begins on: Voting terminates on:
2013-09-30 2013-12-30
Iron ores for blast furnace feedstocks — Determination
of low-temperature reduction-disintegration indices by
dynamic method
Minerais de fer pour charges de hauts fourneaux — Détermination des indices de désintégration par
réduction à basse température, par méthode dynamique
[Revision of secon� edition (ISO 1���0�200�)]
ICS: 73.060.10
THIS DOCUMENT IS A DRAFT CIRCULATED
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ISO/DIS 13930:2013(E)
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TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
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©
PROVIDE SUPPORTING DOCUMENTATION. ISO 2013

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ISO/DIS 13930:2013(E)

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ii © ISO 2013 – All rights reserved

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ISO/CD 13930
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 13930 was prepared by Technical Committee ISO/TC 102, Iron ore and direct reduced iron,
Subcommittee SC 3, Physical testing.
This third edition cancels and replaces the second edition (ISO 13930:2007) to contemplate the care needed
during hand sieving, to introduce the mechanical sieving and to exclude the reference to ISO 4701.

© ISO 2012 – All rights reserved iii

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ISO/CD 13930
Introduction
This International Standard concerns one of a number of physical test methods that have been developed to
measure various physical parameters and to evaluate the behaviour of iron ores, including reducibility,
disintegration, crushing strength, apparent density, etc. This method was developed to provide a uniform
procedure, validated by collaborative testing, to facilitate comparisons of tests made in different laboratories.
The results of this test should be considered in conjunction with other tests used to evaluate the quality of iron
ores as feedstocks for blast furnace processes.
This International Standard may be used to provide test results as part of a production quality control system,
as a basis of a contract, or as part of a research project.

iv © ISO 2012 – All rights reserved

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COMMITTEE DRAFT ISO/CD 13930

Iron ores for blast furnace feedstocks — Determination of low-
temperature reduction-disintegration indices by dynamic
method
CAUTION — This International Standard may involve hazardous materials, operations and equipment.
This standard does not purport to address all of the safety issues associated with its use. It is the
responsibility of the user of this International Standard to establish appropriate safety and health
practices and determine the applicability of regulatory limitations prior to its use.
1 Scope
This International Standard specifies a method to provide a relative measure for evaluating the degree of size
degradation of iron ores when reduced under conditions resembling those prevailing in the low-temperature
reduction zone of the blast furnace.
This International Standard is applicable to lump ores and hot-bonded pellets.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 3082:2009, Iron ores — Sampling and sample preparation procedures
ISO 3310-1:2000, Test sieves — Technical requirements and testing — Part 1: Test sieves of metal wire cloth
ISO 3310-2:1999, Test sieves — Technical requirements and testing — Part 2: Test sieves of perforated
ISO 11323:2010, Iron ore and direct reduced iron — Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 11323 apply.
4 Principle
The test portion is isothermally reduced in a rotating tube bed, at 500 °C, using a reducing gas consisting of
CO, CO , H and N , for 60 min. The reduced product is sieved with sieves having square openings of
2 2 2
6,30 mm, 3,15 mm and 500 μm. Three low-temperature reduction-disintegration indices (LTD) are calculated
as the mass percentage of material greater than 6,30 mm, less than 3,15 mm and less than 500 μm.
© ISO 2012 – All rights reserved 1

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ISO/CD 13930
5 Sampling, sample preparation and preparation of test portions
5.1 Sampling and sample preparation
Sampling of a lot and preparation of a test sample shall be in accordance with ISO 3082.
The size ranges for pellets shall be either - 16,0 mm + 12,5 mm or - 12,5 mm + 10,0 mm.
The size ranges for lump ores shall be - 12,5 mm + 10,0 mm.
A test sample of at least 2,0 kg, on a dry basis, of the sized material shall be obtained.
Oven-dry the test sample to constant mass at 105 C  5 C and cool it to room temperature before
preparation of the test portions.
NOTE Constant mass is achieved when the difference in mass between two subsequent measurements becomes less
than 0,05% of the initial mass of the test sample.
5.2 Preparation of test portion
Collect each test portion by taking ore particles at random.
At least 4 test portions, each of approximately 500 g (± the mass of 1 particle) shall be prepared from the test
sample.
Weigh the test portions to the nearest 1 g and register the mass of each test portion on its recipient label.
6 Apparatus
6.1 General
The test apparatus shall comprise:
a) ordinary laboratory equipment, such as an oven, hand tools, time-control device and safety equipment;
b) a reduction tube assembly;
c) a furnace, with a system to rotate the reduction tube;
d) a system to supply the gases and regulate the flow rates;
e) test sieves;
f) a weighing device.
Figure 1 shows an example of the test apparatus.
6.2 Reduction tube, made of non-scaling, heat-resistant metal to withstand temperatures higher than 500 °C
and resistant to deformation. The internal diameter shall be 150 mm and the internal length shall be 540 mm.
Four equally spaced steel angle lifters, 540 mm long × 20 mm high × 4 mm thick, shall be solidly attached
longitudinally inside the tube by welding, in such a manner as to prevent accumulation of material between the
lifter and tube. A dust collector shall be connected to the tube to trap any fine particles carried in the gas
stream out of the tube during the test. The tube shall be replaced, in any case, when its wall thickness is
reduced to 3 mm in any area, and the lifters when their height is reduced to less than 18 mm.
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ISO/CD 13930
Figure 2 shows an example of a reduction tube.
6.3 Furn
...