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GB/T 6730.1-2016 PDF in English


GB/T 6730.1-2016 (GB/T6730.1-2016, GBT 6730.1-2016, GBT6730.1-2016)
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GB/T 6730.1-2016: PDF in English (GBT 6730.1-2016)

GB/T 6730.1-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 73.060.10
D 31
Replacing GB/T 6730.1-1986
Iron Ores - Preparation of Predried Test Samples for
Chemical Analysis
(ISO 7764:2006, MOD)
ISSUED ON: FEBRUARY 24, 2016
IMPLEMENTED ON: NOVEMBER 1, 2016
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of the People’s Republic of China;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Principle ... 5
4 Instruments and Materials ... 5
5 Test Samples ... 6
6 Operating Procedures ... 6
Foreword
GB/T 6730 Iron Ores is divided into the following parts:
---GB/T 6730.1 Iron Ores - Preparation of Predried Test Samples for Chemical Analysis;
……
This is Part 1 of GB/T 6730.
This Part was drafted in accordance with the rules of GB/T 1.1-2009.
This Part serves as a replacement of GB/T 6730.1-1986 Methods for Chemical Analysis of Iron
Ores - Preparation of Predried Test Samples for Chemical Analysis. In comparison with GB/T
6730.1-1986, apart from editorial modifications, the main technical changes are as follows:
---The Scope of the Standard is re-defined;
---The Normative References is added;
---The Instruments and Materials is added;
---“If the content of chemically combined water or readily oxidizable substances in the test
sample is high, the particle size shall be less than 160 m.” and NOTE are deleted from
“5 Test Samples”;
---“Layer density is not greater than 5 mg/mm2”, “Then, for every 25 min, repeat drying
and weighing, until reaching a constant weight (the test samples dried to a constant
weight are the predried test samples).” and NOTE ①, ③, ④, ⑤, ⑥ are deleted
from “6 Operating Procedures”; “Store the predried test samples in the properly
covered weighing bottle in a desiccator. Quickly weigh the test samples to prevent
reabsorption of water” is modified into “Quickly transfer the test portions to the test
container, and weigh the mass of the weighing bottle and the bottle cap (m2)”; the
expression method and weighing accuracy of the mass of the test portions are added.
This Part adopts the re-drafting method in the modification and adoption of ISO 7764:2006 Iron
Ores - Preparation of Predried Test Samples for Chemical Analysis.
This Part differs from ISO 7764:2006 only in the Normative References: GB/T 10322.1 (GB/T
10322.1-2014, ISO 3082:2009, IDT) which equivalently adopts international standard is used
to replace the superseded ISO 3082:2000.
This Part was proposed by China Iron and Steel Association.
This Part shall be under the jurisdiction of National Technical Committee 317 on Iron Ore and
Direct Reduced Iron of Standardization Administration of China (SAC/TC 317).
Iron Ores - Preparation of Predried Test Samples for
Chemical Analysis
1 Scope
This Part of GB/T 6730 specifies the preparation of predried test samples for the chemical
analysis of iron ores.
This Part is applicable to natural iron ores, iron concentrates and agglomerates, and includes
the preparation of predried test samples in sintered products for chemical analysis.
This Part does not apply to direct reduced iron test samples containing metallic iron, natural or
processed iron ore test samples containing more than 0.2% (mass fraction) of sulfur or more
than 2.5% (mass fraction) of chemically combined water. The above-mentioned test samples
shall adopt GB/T 6730.3.
NOTE 1: loss on ignition can be used to estimate the content of chemically combined water.
NOTE 2: for all samples, GB/T 6730.3 can be adopted to determine the moisture absorption
capacity.
2 Normative References
The following documents are indispensable to the application of this document. In terms of
references with a specified date, only versions with a specified date are applicable to this
document. In terms of references without a specified date, the latest version (including all the
modifications) is applicable to this document.
GB/T 10322.1 Iron Ores - Sampling and Sample Preparation Procedures (GB/T 10322.1-
2014, ISO 3082:2009, IDT)
3 Principle
At 105 C, dry the test samples to a constant weight.
4 Instruments and Materials
4.1 Balance: with a division value of 0.0001 g.
4.2 Drying oven: the temperature can be controlled at 105 C  2 C.
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.