ISO/TR 18230:2015

TECHNICAL ISO/TR
REPORT 18230
First edition
2015-08-15
Iron ores — Determination of loss on
ignition — Non-oxidised ores
Minerais de fer — Détermination de la perte au feu — Minerais non
oxydés
Reference number
ISO/TR 18230:2015(E)
©
ISO 2015

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ISO/TR 18230:2015(E)

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ISO/TR 18230:2015(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Principle . 1
3 Reagents . 1
4 Apparatus . 1
5 Sampling and samples . 2
5.1 Laboratory sample . 2
5.2 Preparation of test samples . 2
6 Procedure. 2
6.1 Number of determinations . 2
6.2 Test portion . 2
6.3 Determination . 2
6.3.1 Pre-treatment of crucible . 2
6.3.2 Determination of LOI . 3
7 Expression of results . 3
7.1 Calculation of loss on ignition . 3
7.2 General treatment of results . 3
7.2.1 Repeatability and permissible tolerances . 3
7.2.2 Determination of analytical result . 4
7.2.3 Between-laboratories precision . 4
7.2.4 Check for trueness . 4
7.2.5 Calculation of final result . 5
8 Test report . 5
Annex A (informative) Flowsheet of the procedure for the acceptanceof analytical values
for test samples . 6
Bibliography . 7
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ISO/TR 18230:2015(E)

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
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described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
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Attention is drawn to the possibility that some of the elements of this document may be the subject of
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The committee responsible for this document is ISO/TC 102, Iron ore and direct reduced iron,
Subcommittee SC 2, Chemical analysis.
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ISO/TR 18230:2015(E)

Introduction
The measurement of loss on ignition (LOI) is a technique widely used in the iron ore industry.
Ignition loss is the sum of contributions from the mass loss of volatile compounds such as water vapour,
carbon dioxide and sulphides (due to the decomposition of goethite and carbonaceous materials),
and the mass gain due to oxidation [Fe(II) to Fe O ]. Its use is complementary to the determination
2 3
of elemental or oxide concentrations. It serves to allow for an addition of the oxides, generated at the
ignition temperature, and the LOI, to arrive at total (oxide + LOI). The determination of LOI is essential
in sinter plant and blast furnace balance calculations, as it is used to calculate calcinated elemental
concentrations.
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TECHNICAL REPORT ISO/TR 18230:2015(E)
Iron ores — Determination of loss on ignition — Non-
oxidised ores
WARNING — This Technical Report may involve hazardous materials, operations and equipment.
This Technical Report does not purport to address all of the safety problems associated with its
use. It is the responsibility of the user of this Technical Report to establish appropriate health
and safety practices and determine the applicability of regulatory limitations prior to use.
1 Scope
This Technical Report describes a gravimetric method for the determination of the loss in mass of non-
oxidized iron ores, when ignited at 1 000 °C.
This method is applicable to a concentration range of a mass fraction of −3,0 % to 7,0 % loss on ignition
in natural iron ores, iron ore concentrates and agglomerates, and sinters.
...