ISO 11536:2015

INTERNATIONAL ISO
STANDARD 11536
First edition
2015-08-01
Iron ores — Determination of loss on
ignition — Gravimetric method
Minerais de fer — Détermination de la perte au feu — Méthode
gravimétrique
Reference number
ISO 11536:2015(E)
©
ISO 2015

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ISO 11536:2015(E)

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ISO 11536:2015(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Principle . 1
4 Reagents . 1
5 Apparatus . 1
6 Sampling and samples — Laboratory sample . 2
7 Procedure. 2
7.1 General . 2
7.2 Number of determinations . 2
7.3 Determination of hygroscopic moisture content. 2
7.4 Test portion . 2
7.5 Determination . 3
8 Expression of results . 3
8.1 Calculation of loss on ignition . 3
8.2 General treatment of results . 3
8.2.1 Repeatability and permissible tolerances . 3
8.2.2 Determination of analytical result . 4
8.2.3 Between-laboratories precision . 4
8.2.4 Check for trueness . 4
8.2.5 Calculation of final result . 5
9 Test report . 5
Annex A (normative) Flowsheet of the procedure for the acceptance of analytical values for
test samples . 6
Bibliography . 7
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ISO 11536:2015(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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electrotechnical standardization.
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described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
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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 11536:2015(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 water vapour, carbon dioxide
and sulfides (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 of elemental or oxide
2 3
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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INTERNATIONAL STANDARD ISO 11536:2015(E)
Iron ores — Determination of loss on ignition —
Gravimetric method
WARNING — This International Standard may involve hazardous materials, operations and
equipment. This International Standard does not purport to address all of the safety problems
associated with its use. It is the responsibility of the user of this International Standard to
establish appropriate health and safety practices and determine the applicability of regulatory
limitations prior to use.
1 Scope
This International Standard specifies a gravimetric method for the determination of the loss in mass of
fully-oxidized iron ores, when ignited at 1 000 °C.
This method is applicable to a concentration range of 1,0 % (m/m) to 10,0 % (m/m) loss on ignition in
natural iron ores, iron ore concentrates and agglomerates.
The method is not applicable to the following:
a) Processed ores containing metallic iron (direct reduced iron);
b) Natural or processed ores in which the sulfur content is higher than 0,2 % (m/m);
c) Natural or processed ores in which the content of partially-oxidized iron is more than 1,0 % (m/m).
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its applic
...