GB/T 6730.5-2022 PDF English
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| GB/T 6730.5-2022 | English | 260 |
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Iron ores - Determination of total iron content - Titrimetric methods after titanium(III) chloride reduction
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| GB/T 6730.5-2007 | English | 130 |
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Iron ores -- Determination of total iron content -- Titanium (Ⅲ) chloride reduction methods
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| GB/T 6730.5-1986 | English | 319 |
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Methods for chemical analysis of iron ores--The titanium chloride-potassium dichromate volumetric method for the determination of total iron content
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GB/T 6730.5-2022: Iron ores - Determination of total iron content - Titrimetric methods after titanium(III) chloride reduction
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT6730.5-2022
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 73.060.10
CCS D 31
Replacing GB/T 6730.5-2007
Iron Ores - Determination of Total Iron Content -
Titrimetric Methods after Titanium (III) Chloride
Reduction
[ISO 2597-2.2019, Iron Ores - Determination of Total Iron Content - Part 2.
Titrimetric Methods after Titanium (III) Chloride Reduction, MOD]
Issued on. APRIL 15, 2022
Implemented on. NOVEMBER 1, 2022
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
Introduction... 5
1 Scope... 6
2 Normative References... 6
3 Terms and Definitions... 7
4 Principle... 7
5 Reagents... 7
6 Instruments... 9
7 Specimen Collection and Preparation... 10
8 Analytical Procedures... 11
9 Result Calculation and Expression... 14
10 Test Report... 16
Appendix A (informative) Constituent Documents of GB/T 6730... 18
Appendix B (normative) Acceptance Procedure of Specimen Analysis Results... 23
Foreword
This document was drafted in accordance with the rules in GB/T 1.1-2020 Directives for
Standardization - Part 1.Rules for the Structure and Drafting of Standardizing Documents.
This document is Part 5 of GB/T 6730.See Appendix A for the parts of GB/T 6730 that have
been issued.
This document serves as a replacement of GB/T 6730.5-2007 Iron Ores - Determination of
Total Iron Content - Titanium (III) Chloride Reduction Methods. In comparison with GB/T
6730.5-2007, apart from structural adjustments and editorial modifications, the main technical
changes are as follows.
a) “Normative References” is modified (see Chapter 2; Chapter 2 of Version 2007);
b) “Terms and Definitions” is added (see Chapter 3);
c) “melting-acidification” is modified into “melting-filtration” (see 8.5.1.2; 7.5.1.2 of
Version 2007);
d) The method of handling excess adding of stannous chloride solution is added (see
8.5.2);
e) The expression of NOTE in “8.5.3 Titration” is modified (see 8.5.3; 7.5.3 of Version
2007);
f) The expressions of “precision”, “correctness inspection” and “calculation of final
results” are modified (see Chapter 9; Chapter 8 of Version 2007).
This document modifies and adopts ISO 2597-2.2019 Iron Ores - Determination of Total Iron
Content - Part 2.Titrimetric Methods after Titanium (III) Chloride Reduction. In comparison
with ISO 2597-2.2019, apart from editorial modifications, the main technical changes are as
follows.
a) In Normative References, national standards are adopted to replace the corresponding
international standards, and GB/T 601 and GB/T 8170 are added (see Chapter 2);
b) For excess reducing agent, this document uses dilute potassium dichromate solution
for oxidation; ISO 2597-2.2019 uses dilute potassium dichromate solution for
oxidation (method 1) or perchloric acid for oxidation (method 2);
c) For the crucible used for melting-filtration decomposition specimen, this document
uses corundum crucible; ISO 2597-2.2019 uses corundum crucible, zirconium
crucible or vitreous carbon crucible;
d) For the heating mode of melting-filtration, this document directly adopts a high-
temperature furnace; ISO 2597-2.2019 also uses a burner for heating, in addition to
the high-temperature furnace;
e) For the oxidation-reduction indicating agent, this document adopts sodium tungstate
as the indicating agent; ISO 2597-2.2019 uses isatin as the indicating agent;
f) This document adds the separation method applied when the copper content is high;
g) This document adopts the numerical value rounding-off method provided in GB/T
8170 to replace the numerical value rounding-off method provided in “calculation of
final results” in ISO 2597-2.2019.
Please be noted that certain content of this document may involve patents. The institution
issuing this document does not undertake the responsibility of identifying these patents.
This document was proposed by China Iron and Steel Association.
This document 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).
The drafting organizations of this document. Sinosteel Maanshan General Institute of Mining
Research Co., Ltd.; Lianyungang Xingxin Steel Co., Ltd.; Huawei Metal Mineral Resources
Efficient Recycling National Engineering Research Center Co., Ltd.; Hebei Jinxi Iron and Steel
Group Co., Ltd.
The main drafters of this document. Hua Shaoguang, Xu Xiuping, Li Bo, Hai Bing, Zheng
Guizeng, Su Wenxing, Wang Yan, Zeng Shenjin, Yang Qian, Xu Mingwang, Ma Yongfu.
This document was issued for the first time in 1986.The first revision was issued in 2007.This
is the second revision.
1 Scope
This document specifies the method for the determination of total iron content by potassium
dichromate titration method after reduction of iron with titanium trichloride.
2 Normative References
The contents of the following documents constitute indispensable clauses of this document
through the normative references in this text. 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.
3 Terms and Definitions
This document does not have terms or definitions that need to be defined.
4 Principle
For specimen containing over 0.05% vanadium, use alkali to melt it; use water to leach the
cooled melt and filter it; after using sodium hydroxide solution to rinse the precipitate, use
hydrochloric acid to dissolve the precipitate.
5 Reagents
Unless it is otherwise specified in the analysis, only approved analytically pure reagents, and
distilled water that complies with the stipulations of GB/T 6682, or water of equivalent purity
can be used.
6 Instruments
Unless it is otherwise specified, the used one-mark volumetric flasks and one-mark pipettes
shall comply with the stipulations of GB/T 12806 and GB/T 12808.
7 Specimen Collection and Preparation
Ores with high content of chemically combined water or readily oxidizable substance
For the following types of ores, in accordance with GB/T 6730.3, prepare air balance specimens.
8 Analytical Procedures
Carry out a blank test with the specimen analysis (see 8.5.4 for the requirements). All reagents
must be taken from the same reagent bottle. When analyzing multiple specimens, a blank value
may be applicable.
9 Result Calculation and Expression
In accordance with the steps of Appendix B, in accordance with Formula (2), calculate the result
of independent repeated measurements. Compare it with the repeatability limit (r) and
determine the final analysis result.
10 Test Report
The test report shall include the following information.
Appendix A
(informative)
Constituent Documents of GB/T 6730
The constituent documents of GB/T 6730 are as follows.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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