GB/T 10322.5-2000 English PDF (GBT10322.5-2000)

Delivery: 3 seconds. Download true-PDF + Invoice.Newer version: (Replacing this standard) GB/T 10322.5-2016
Get QUOTATION in 1-minute: Click GB/T 10322.5-2000
Historical versions: GB/T 10322.5-2000
Preview True-PDF (Reload/Scroll if blank)

GB/T 10322.5-2000: Iron ores - Determination of moisture content of a consignment
GB/T 10322.5-2000
ICS 73.060.10
D 31
GB
NATIONAL STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
idt ISO 3087.1998
Iron Ores – Determination of Moisture
Content of a Consignment
ISSUED ON. JUNE 05, 2000
IMPLEMENTED ON. NOVEMBER 01, 2000
Issued by. The State Bureau of Quality and Technical Supervision
Table of Contents
Foreword ... 3
ISO Foreword ... 4
Introduction ... 5
1 Scope ... 6
2 Normative References ... 6
3 Definitions ... 6
4 Principle ... 6
5 Apparatus ... 6
6 Samples ... 7
7 Procedure ... 7
8 Verification ... 8
9 Calculation and Expression of Results ... 8
10 Test Report ... 10
Annex A (Normative) Determination of Moisture Content of Adhesive or Wet Iron Ores ... 11
Annex B (Normative) Corrections for Sprinkled Water and/or Rain-water ... 13
Annex C (Informative) Precision of Moisture Measurement ... 17
Annex D (Informative) Examples of Test Reports ... 18
Foreword
This standard is equivalent to ISO 3087.1998 “Iron Ores - Determination of the Moisture
Content of a consignment”.
During the execution, GB/T 10322.1 “Iron Ores - Sampling and Sample Preparation
Procedures” shall be used together.
This standard is one of the series standards about iron ores. It is independent with GB/T
2007.6-1987 “General Rules for the Sampling and Sample Preparation of Minerals in bulk -
Determination of Moisture Content - Heat Drying Method”. Both of the standards may be used
depending on the needs of the users.
Annex A and Annex B are normative.
Annex C and Annex D are informative.
This standard was proposed by the State Bureau of Metallurgical Industry.
This standard shall be under the jurisdiction of China Metallurgical Information
Standardization Institute.
Responsible drafting organization. Baosteel Group Corporation.
Participating drafting organizations. China Metallurgical Information Standardization
Institute, Shougang Group, and Wuhan Iron and Steel (Group) Corp.
Main drafting staffs of this standard. Song Daofa, Jing Aifan, Jiang Zhikan, Chen Xiaoqi,
Zhang Lei, Tian Xiuzhen, and Zhu Hongbin.
ISO 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, governmental and non-governmental organizations, 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.
Draft International Standards adopted by the technical committees are circulated to the
member bodies for voting. Publication as an International Standard requires voting approval by
at least 75 % of the member bodies.
International Standard ISO 3087 was prepared by SCI Subcommittee of ISO/TC 102 Iron
Ores Technical Committee.
This is the technical revised 3rd edition. It replaces the 2nd edition (ISO 3087.1987).
Annexes A and B are integral parts of this standard. Annexes C and D are for information.
Introduction
Nowadays, large tonnages of iron ores are traded internationally. A minor difference of
the measured moisture content (expressed in mass percentage) of a consignment has
considerable effect on the commercial transaction of iron ores. Therefore, the proper
determination of moisture content of a consignment is a common interest matter for both the
purchaser and the supplier.
This standard does not determine the hygroscopic moisture content in chemical
analytical samples. If the hygroscopic moisture content is required to be determined, reference
should be made to ISO 2596.1994 “Iron ores – Determination of Hygroscopic Moisture in
Analytical Samples – Gravimetric and Karl Fischer Methods”.
Iron Ores – Determination of Moisture Content
of a Consignment
1 Scope
This standard specifies the method for the determination of the moisture content of a
consignment of iron ore.
This method is applicable to all iron ores, regardless they are natural or processed.
2 Normative References
The following standards contain provisions which, through reference in this standard,
constitute provisions of this standard. At the time of publication, the editions indicated were
valid. All standards are subject to revision, and parties who enter into agreements based on this
standard are encouraged to investigate the possibility of applying the most recent editions of
the standards indicated below.
GB/T 10322.1-2000 “Iron Ores - Sampling and Sample Preparation Procedures”
ISO 11323.1996 “Iron Ores – Vocabulary”
Note. The translation of ISO 11323.1996 is detailed in “Compilation of International Standard on Iron Ores” published in
1999 by the China Metallurgical Information Standardization Institute.
3 Definitions
For the purposes of this standard, the definitions given in ISO 11323 apply.
4 Principle
Dry the test sample in air at 105 ºC to constant weight. Measure the loss of mass. Calculate
the moisture content.
5 Apparatus
5.1 Drying pan. having a smooth surface, free from contamination, capable of
accommodating the specified quantity of a test sample in a layer of nominal thickness not
greater than 31.5 mm.
5.2 Drying oven. equipped with a temperature indicator and control apparatus, capable of
regulating the temperature at any point in the oven at 105ºC ± 5ºC. It is so designed to maintain
this temperature with a air current to ensure efficient drying, but without any loss of sample. It
Where.
w — the mean value of the moisture content of a sample containing rain-water, expressed
in mass percentage, calculated to the second decimal place;
mR — the mass of rain-water, in t;
m4 — the mass of the consignment as-received without rain-water, as determined in B2.3,
in t.
B3.7 Calculation of moisture content corrected for rain-water influx, during loading
operations after taking moisture samples
When a consignment is partially or totally exposed to rain during loading operations after
taking moisture samples, then the moisture content wR of the consignment is calculated by
Equation (B4), expressed in mass percentage, reported to the first decimal place.
(B5)
Where.
w — the mean value of the moisture content of sample taken prior to rain, expressed in
mass percentage, calculated to the second decimal place;
mR — the mass of rain-water, in t;
m5 — the mass of the consignment containing rain-water, as determined in B2.3, in t.
B4 Corrections for both sprinkled water and rain-water influx during unloading
operations prior to taking moisture samples
The corrected moisture content wo of a consignment which has been wetted with both
sprinkled water and rain-water prior to taking moisture samples is calculated by Equation (B6),
expressed in mass percentage, reported to the first decimal place.
(B6)
Where.
f, m3, m4, mR and w are same as the ones defined previously.
B5 Corrections for both sprinkled water and rain-water influx during loading
operations after taking moisture samples
The corrected moisture content wo of a consignment which has been wetted with both
sprinkled water and rain-water after taking moisture samples is calculated by Equation (B7),
expressed in mass percentage, reported to the first decimal place.