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GB/T 6730.25-2021: Iron ores - Determination of total rare earth contents - Oxalate gravimetric method
Status: Valid GB/T 6730.25: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 6730.25-2021 | English | 289 |
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Iron ores - Determination of total rare earth contents - Oxalate gravimetric method
| Valid |
GB/T 6730.25-2021
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| GB/T 6730.25-2006 | English | 319 |
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Iron ores -- Determination of total rare earth contents -- Oxalate gravimetric method
| Obsolete |
GB/T 6730.25-2006
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| GB/T 6730.25-1986 | English | 199 |
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Methods for chemical analysis of iron ores--The gravimetric method for the determination of rare earth elements content
| Obsolete |
GB/T 6730.25-1986
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PDF similar to GB/T 6730.25-2021
Basic data | Standard ID | GB/T 6730.25-2021 (GB/T6730.25-2021) | | Description (Translated English) | Iron ores - Determination of total rare earth contents - Oxalate gravimetric method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | D31 | | Word Count Estimation | 14,128 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 6730.25-2021: Iron ores - Determination of total rare earth contents - Oxalate gravimetric method
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Iron ores -- Determination of total rare earth contents -- Oxalate gravimetric method
ICS 73:060:10
CCSD31
National Standards of People's Republic of China
Replacing GB/T 6730:25-2006
Determination of the total amount of rare earth in iron ore by oxalate gravimetric method
Published on 2021-12-31
2022-07-01 Implementation
State Administration for Market Regulation
Released by the National Standardization Administration
foreword
This document is in accordance with the provisions of GB/T 1:1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents"
drafted:
This document is Part 25 of GB/T 6730: See Appendix A for the published part of GB/T 6730:
This document replaces GB/T 6730:25-2006 "Oxalate Gravimetric Method for Determination of Total Rare Earths in Iron Ore", and
Compared with GB/T 6730:25-2006, in addition to structural adjustment and editorial changes, the main technical changes are as follows:
a) Change the measurement range to "1:00%~20:00%" (see Chapter 1, Chapter 1 of the:2006 edition);
b) the chapter "Apparatus and Equipment" was added (see Chapter 6);
c) Changed the amount of sodium hydroxide used when the sample is decomposed (see 8:4:1, 7:4:1 of the:2006 edition);
d) Add 0:5mL of hydrogen peroxide to dissolve salts by heating (see 8:4:2);
e) Changed the amount of hot oxalic acid solution added during oxalic acid precipitation and the precipitation aging time (see 8:4:3,:2006 edition of
7:4:3);
f) Added "General Handling of Analysis Results" (see 9:2):
Please note that some content of this document may be patented: The issuing agency of this document assumes no responsibility for identifying patents:
This document is proposed by China Iron and Steel Association:
This document is under the jurisdiction of the National Standardization Technical Committee of Iron Ore and Direct Reduced Iron (SAC/TC317):
This document is drafted by: Baotou Rare Earth Research Institute, Tianjin Baotou Steel Rare Earth Research Institute Co:, Ltd:, Hubei Province Southeastern Hubei New Building Materials
Material Product Quality Supervision and Inspection Center, China North Rare Earth (Group) High-Tech Co:, Ltd:, Baotou Steel Group Mining Research Institute (Limited Liability)
Company), Inner Mongolia Autonomous Region Rare Earth Product Quality Supervision and Inspection Research Institute, National Tungsten and Rare Earth Product Quality Supervision and Inspection Center, Baotou Customs Comprehensive
Joint Technical Service Center, Baotou Huamei Rare Earth High-Tech Co:, Ltd:
The main drafters of this document: Zhu Yueran, Wang Dan, Wang Dongjie, Cheng Zhimin, Yang Ling, Jian Weining, Chen Sheng, Wang Anli, Xu Ning, Guo Li, Li Tingting,
Cao Junjie, Wang Ke, Kang Jing:
This document was first published in 1986, and was revised for the first time in:2006: This is the second revision:
Introduction
Iron ore is the main raw material for the steel industry: In the iron and steel industry standard system, the standard system for the determination of chemical composition of iron ore is
A very important part of them plays an important role in ensuring the quality of iron ore products: This series of method standards serves the production of iron ore:
production, trade and application, and provide technical support for the high-quality development of my country's iron and steel industry:
GB/T 6730 includes a series of standards for the determination of chemical composition of iron ore, which respectively stipulates moisture, total iron and metal in iron ore products:
Iron, ferrous, silicon, aluminum, calcium, magnesium, sulfur, phosphorus, manganese, titanium, total rare earth, barium, chromium, vanadium, tin, copper, cobalt, nickel, zinc, niobium, bismuth, potassium, sodium, carbon , lead, arsenic,
Methods for the determination of chemical components such as cadmium, mercury, fluorine, chlorine, loss on ignition, and combined water:
In 1986, GB/T 6730 issued 51 national standards for the determination of chemical composition of iron ore for the first time:
According to the development of technology and the actual needs of production, after years of continuous formulation and revision work, a relatively complete standard system has been formed at present:
The GB/T 6730 constituent documents are detailed in Appendix A:
GB/T 6730:25 provides a method for the determination of the total amount of rare earth in iron ore by oxalate gravimetric method: After this revision, it is in line with international standards:
be consistent:
Determination of the total amount of rare earth in iron ore by oxalate gravimetric method
Caution - Persons using this document should have practical experience in formal laboratory work: This document does not address all possible security issues
question: It is the user's responsibility to take appropriate safety and health measures and to ensure compliance with the conditions stipulated by relevant national regulations:
1 Scope
This document specifies the oxalate gravimetric method for the determination of the total amount of rare earths:
This document applies to the determination of the total amount of rare earths in natural iron ores, iron concentrates and lumps, including sintered products: Measurement range (mass points
number): 1:00%~20:00%:
2 Normative references
The contents of the following documents constitute essential provisions of this document through normative references in the text: Among them, dated citations
documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to
this document:
GB/T 6379:1 Accuracy (correctness and precision) of measurement methods and results - Part 1: General provisions and definitions
GB/T 6379:2 Accuracy (correctness and precision) of measurement methods and results - Part 2: Determining repetition of standard measurement methods
Basic Methods of Reproducibility and Reproducibility
GB/T 6682 Analysis Laboratory Water Specifications and Test Methods
GB/T 6730:1 Preparation of pre-dried samples for iron ore analysis
GB/T 8170 Numerical Rounding Rules and Representation and Judgment of Limit Values
GB/T 10322:1 Iron ore sampling and sample preparation method
GB/T 12690:12 Method for Chemical Analysis of Non-Rare Earth Impurities in Rare Earth Metals and Their Oxides - Determination of Thorium Content by Arsazo III Spectroscopy
Photometry and Inductively Coupled Plasma Mass Spectrometry
GB/T 12806 Laboratory glass instrument single-line volumetric flask
GB/T 12807 Laboratory glass instrument indexing pipette
GB/T 12808 Laboratory glass instrument single reticle pipette
3 Terms and Definitions
There are no terms and definitions that need to be defined in this document:
4 Principles
The sample was melted by sodium hydroxide and sodium peroxide, leached with dilute triethanolamine, and in the presence of hydroxylamine hydrochloride and ascorbic acid, the
EDTA complexation separates interfering elements such as iron, manganese, aluminum, and calcium:
The oxalic acid precipitate was calcined at 900°C into oxides and weighed: The mass of the obtained oxide minus the amount of thorium dioxide is the amount of rare earth oxide:
5 Reagents
Unless otherwise specified, only use approved analytical reagents and secondary water in accordance with GB/T 6682 or its purity
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