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GB/T 6730.73-2024: Iron ores - Determination of total iron content - EDTA photometric titration method
Status: Valid GB/T 6730.73: Evolution and historical versions
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| GB/T 6730.73-2024 | English | 359 |
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Iron ores - Determination of total iron content - EDTA photometric titration method
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GB/T 6730.73-2024
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| GB/T 6730.73-2016 | English | 238 |
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Iron ores -- Determination of total iron content -- EDTA photometric titration method
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GB/T 6730.73-2016
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Basic data | Standard ID | GB/T 6730.73-2024 (GB/T6730.73-2024) | | Description (Translated English) | Iron ores - Determination of total iron content - EDTA photometric titration method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | D31 | | Classification of International Standard | 73.060.10 | | Word Count Estimation | 18,161 | | Date of Issue | 2024-04-25 | | Date of Implementation | 2024-11-01 | | Older Standard (superseded by this standard) | GB/T 6730.73-2016 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 6730.73-2024: Iron ores - Determination of total iron content - EDTA photometric titration method
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ICS 73:060:10
CCSD31
National Standards of People's Republic of China
Replaces GB/T 6730:73-2016
Determination of total iron content in iron ore
EDTA photometric titration
Released on 2024-04-25
2024-11-01 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
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 for standardization documents"
Drafting:
This document is Part 73 of GB/T 6730 "Iron Ore": The published parts of GB/T 6730 are shown in Appendix A:
This document replaces GB/T 6730:73-2016 "Determination of total iron content in iron ore - EDTA photometric titration method"
Compared with GB/T 6730:73-2016, in addition to structural adjustments and editorial changes, the main technical changes are as follows:
a) Added reagent blank (see 5:14:3);
b) The sample quantity has been changed (see 8:2, 7:1 of the:2016 edition);
c) Added blank test (see 8:3);
d) The digestion time and temperature of microwave digestion were changed, as well as the interference elimination method: sulfuric acid was used to eliminate titanium interference, and boric acid was used to reduce
Effect of fluorine (see 8:4:1:1, 7:3:1 of the:2016 edition);
e) Method 2: Alkali fusion method for decomposing samples (see 8:4:1:2);
f) The titration method has been changed (see 8:4:2, 7:3:2 of the:2016 edition);
g) Added the determination of blank test value (see 8:5);
h) The precision of both methods has been increased (see 9:3):
Please note that some of the contents of this document may involve patents: The issuing organization of this document does not assume the responsibility for identifying patents:
This document was proposed by the China Iron and Steel Association:
This document is under the jurisdiction of the National Iron Ore and Direct Reduced Iron Standardization Technical Committee (SAC/TC317):
This document was drafted by: Guangzhou Customs Technology Center, Guangdong Zhongnan Iron and Steel Co:, Ltd:, Chengdu Advanced Metal Materials Industry Technology Research Institute
Institute Co:, Ltd:, Fangcheng Customs Comprehensive Technical Service Center, Lianyungang Customs Comprehensive Technical Center, Binzhou Customs, Zhanjiang Customs Technical Center
Center, Huangpu Customs Technology Center, Tianjin Customs Chemical Mineral Metal Material Testing Center, Shijiazhuang Customs Technology Center, Qingdao Customs Technology Center, Shanghai
Haikou Customs Industrial Products and Raw Materials Testing Technology Center, Ningbo Customs Technology Center, Metallurgical Industry Information Standards Research Institute, Baosteel Co:, Ltd:
Co:, Ltd:, Wuhan Iron and Steel Co:, Ltd:, Anshan Iron and Steel Co:, Ltd:, Longbai Sichuan Mining and Metallurgy Co:, Ltd:, Sun Yat-sen University, Mettler Toledo Technologies
(China) Co:, Ltd:, Swiss Metrohm China Co:, Ltd:
The main drafters of this document are: Peng Subiao, Xiao Qian, Xiao Dahui, Zheng Jianguo, Luo Yumei, He Yingxian, Zhang Rui, Xuan Jianwen, Liang Yuefeng, Zhang Yue,
Wang Qinghe, Wushu, Yao Jie, Luo Minggui, Li Xiangrong, Jiang Yu, Wang Yingjie, Wei Jibin, Tian Qiong, Huang Wei, Li Quanbin, Zhao Chao, Yue Chunlei, Zhu Zhixiu,
Min Hong, Ying Haisong, Wang Tiantian, Chen Hailan, Zhou Zheng, Yu Lujun, Yu Aijun, Chen Yunpeng, Zou Xiaoyong, Li Yiqian, Wang Zhongguang:
This document was first published in:2016 and this is the first revision:
Introduction
Iron ore is the main raw material for the steel industry: In the standard system of the steel industry, the standard system for determination of chemical composition of iron ore is one of the most important standards:
It is a very important part of the production process and plays an important role in ensuring the quality of iron ore products:
production, trade and application, providing technical support for the high-quality development of my country's steel industry:
GB/T 6730 includes a series of standards for the determination of chemical composition of iron ore, which respectively stipulates the content of moisture, total iron, metal
Iron, ferrous iron, 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,
Determination methods for chemical components such as cadmium, mercury, fluorine, chlorine, loss on ignition and combined water:
In 1986, GB/T 6730 first issued 51 national standards for the determination of chemical composition of iron ore:
Based on the development of technology and actual production needs, after years of continuous formulation and revision, a relatively complete standard system has been formed:
The parts of GB/T 6730 to be published are shown in Appendix A:
Determination of total iron content in iron ore
EDTA photometric titration
Warning---People who use this document need to have practical experience in formal laboratory work: This document does not address all possible safety issues:
The user is responsible for taking appropriate safety and health measures and ensuring that the conditions specified in the relevant national standards and regulations are met:
1 Scope
This document describes a method for the determination of total iron content in iron ores by photometric titration with EDTA:
This document is applicable to the determination of total iron content in natural iron ore, iron concentrate and artificial agglomerate ore (including sintered ore and pelletized ore):
(Mass fraction): 30:0%~72:0%:
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document:
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document:
GB/T 6730:1 Preparation of pre-dried samples for iron ore analysis
GB/T 6730:3 Determination of moisture content in iron ore analysis samples - Gravimetric method, Karl Fischer method and mass loss method
GB/T 8170 Rules for rounding off values and expression and determination of limit values
GB/T 10322:1 Iron ore sampling and sample preparation methods
GB/T 12805 Laboratory glass instrument burette
GB/T 12806 Laboratory glassware single-line volumetric flasks
GB/T 12808 Laboratory glassware single-line pipettes
3 Terms and definitions
There are no terms or definitions that require definition in this document:
4 Principle
4:1 Method 1---Microwave digestion
The sample was decomposed by microwave digestion with a hydrochloric acid-nitric acid-hydrofluoric acid mixed solution, and the solution was diluted with water and adjusted to a
The pH is 1, sulfuric acid is used to eliminate the interference of titanium, boric acid is used to reduce the influence of fluorine, and disodium ethylenediaminetetraacetic acid standard solution is used for titration to calculate the total iron
content:
4:2 Method 2---Alkali Fusion Method
The sample was melted with sodium peroxide-sodium hydroxide, the melt was dissolved with hydrochloric acid-nitric acid, the interference of titanium was eliminated with sulfuric acid, and the sample was masked with ammonium fluoride:
Aluminum shielding, use boric acid to eliminate excess fluoride, dilute with water, adjust the test solution to pH 1 with sodium hydroxide, and use disodium ethylenediaminetetraacetic acid as a standard
The solution was titrated and the total iron content was calculated:
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