ISO 2596:2006 鉄鉱石—分析サンプル中の吸湿性水分の測定—重量分析、カールフィッシャーおよび質量損失法 | ページ 2

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 2596 was prepared by Technical Committee ISO/TC 102, Iron ore and direct reduced iron, Subcommittee SC 2, Chemical analysis.

This fifth edition cancels and replaces the fourth edition (ISO 2596:1994), which has been technically revised.

Introduction

In the analysis of iron ores, the reporting limit of the analytical value of each constituent on a dry sample basis can be achieved by using predried samples. However, with certain ore types ここで, the constituent being determined is above a certain concentration level as specified in the scope, this technique can produce erroneous results. In these cases, for the calculation of analytical values of the other constituents in the ore to a dry sample basis, a direct determination of the hygroscopic moisture content becomes necessary.

1 Scope

This International Standard specifies the following four test methods for the determination of the hygroscopic moisture content of test samples:

Method 1 — Gravimetric method;

Method 2 — Karl Fischer volumetric method;

Method 3 — Karl Fischer coulometric method;

Method 4 — Mass-loss method.

Any of these methods is applicable wherever the analytical value of a chemical constituent is to be calculated to a dried sample basis in the following ore types.

• a) Processed ores containing metallic iron (direct reduced iron).
• b) Natural or processed ores in which the sulfur content is greater than 0,2 % (mass fraction).
• c) Natural or processed ores in which the combined water is greater than 2,5 % (mass fraction).

Any of these methods is applicable to a concentration range of 0,05 % (mass fraction) to 4,5 % (mass fraction) hygroscopic moisture.

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.

Bibliography