Path: Home > GB/T > Page566 > GB/T 6730.11-2025

Price & Delivery

US$419.00 · In stock · Download in 9 seconds
GB/T 6730.11-2025: Iron ores - Determination of aluminium content - EDTA titrimetric method
Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure
Status: Valid

Std ID	Version	USD	Buy	Deliver [PDF] in	Title (Description)
GB/T 6730.11-2025	English	419	Add to Cart	4 days [Need to translate]	Iron ores - Determination of aluminium content - EDTA titrimetric method
GB/T 6730.11-2007	English	160	Add to Cart	0--9 seconds. Auto-delivery	Iron ores -- Determination of aluminium content -- EDTA titrimetric method
GB/T 6730.11-1986	English	439	Add to Cart	4 days [Need to translate]	Methods for chemical analysis of iron ores--The fluoride replacement complexometric method for the determination of aluminum content

GB/T 6730.11-2025: Iron ores - Determination of aluminium content - EDTA titrimetric method

---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/GBT6730.11-2025
ICS 73.060.10 CCSD31 National Standards of the People's Republic of China Replaces GB/T 6730.11-2007 Determination of Aluminum Content in Iron Ore by EDTA Titration (ISO 6830.1986, MOD) Published on 2025-08-29 Implemented on 2026-03-01 State Administration for Market Regulation The State Administration for Standardization issued a statement.

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents". Drafting. This document is Part 11 of GB/T 6730.Previous parts of GB/T 6730 are listed in Appendix A. This document replaces GB/T 6730.11-2007 "Determination of Aluminum Content in Iron Ore by EDTA Titration Method", and is consistent with GB/T 6730.11- Compared to.2007, aside from structural adjustments and editorial changes, the main technical changes are as follows. a) A new chapter, "3.Terms and Definitions," has been added (see Chapter 3); b) Some content in "5 Reagents" has been changed (see Chapter 5, Chapter 4 in the.2007 edition); c) Some content in “6 Instruments” has been changed (see Chapter 6, Chapter 5 in the.2007 edition); d) The sample preparation method in "7.2.1 Ores with high content of combined water or easily oxidizable substances" has been added (see 7.2.1); e) The description of the temperature range in "8.4.1 Decomposition of the Specimen" has been changed (see 8.4.1, 7.4.1 in the.2007 version); f) The formula for calculating aluminum content has been changed (see 9.1, 8.1 in the.2007 version); g) The wording for precision and accuracy checks has been revised (see Chapter 9, Chapter 8 in the.2007 edition); h) The description of the determination of the analysis results has been changed (see 9.2.2, 8.2.5 in the.2007 version). This document is modified to adopt ISO 6830.1986 "Determination of aluminum content in iron ore by EDTA titration". This document has undergone significant structural adjustments compared to ISO 6830.1986.A summary table of the structural numbering changes between the two documents is attached. Record B. This document differs significantly from ISO 6830.1986 in several technical aspects. The relevant clauses are indicated in vertical single-line margins. The lines (|) are used for marking. A summary of these technical differences and their reasons can be found in Appendix C. Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents. This document was proposed by the China Iron and Steel Association. This document is under the jurisdiction of the National Technical Committee on Standardization of Iron Ore and Direct Reduced Iron (SAC/TC317). This document was drafted by. China Steel Group Maanshan Mining Research Institute Co., Ltd., and China Certification & Inspection Group Hebei Co., Ltd. Baowu Resources Co., Ltd., Hengyang Valin Steel Pipe Co., Ltd., Yangchun New Steel Co., Ltd., Metallurgical Industry Standards and Information Research Institute, Tongling Technology Center of Nonferrous Metals Group Holdings Limited. The main drafters of this document are. Hua Shaoguang, Li Xiangmei, Li Bo, Chen Hailin, Li Peiliang, Wang Yang, He Le, Fan Yaogui, Zhou Weiping, and Zhang Xiaoyan. Liu Qian, Jiang Xue, Yang Qian, Tang Fang, Xia Xiangwei, Long Haishan, Ma Linlin, Xuan Nan, Wan Lili, Lin Shengsen, Zhang Xiaorui, Zhang Wenjuan, Liang Zheng, Zhang Chen Yuan Qidong and Gao Chunqing. This document was first published in 1986, revised for the first time in.2007, and this is the second revision.

introduction

Iron ore is the main raw material for the steel industry. Within the steel industry's standard system, the standard system for determining the chemical composition of iron ore is its core component. This is a very important part of the process and plays a vital role in ensuring the quality of iron ore products. This series of method standards serves the production of iron ore. Production, trade, and application provide 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 describe the determination of moisture, total iron, and metal content in iron ore products. Iron, ferrous iron, silicon, aluminum, calcium, magnesium, sulfur, phosphorus, manganese, titanium, total rare earth elements, barium, chromium, vanadium, tin, copper, cobalt, nickel, zinc, niobium, bismuth, potassium, sodium, carbon, lead, arsenic. Methods for determining chemical components such as mercury, fluorine, chlorine, loss on ignition, and combined water. In 1986, GB/T 6730 was the first national standard to release 51 methods for the determination of chemical composition of iron ore. This standard reflects the advancements in analytical techniques in the iron ore field. Based on technological development and actual production needs, and through years of continuous revision and development, a relatively complete standard system has been formed, currently in place. For details of the constituent documents of GB/T 6730, please refer to Appendix A. Determination of Aluminum Content in Iron Ore by EDTA Titration Warning---Personnel using this document should have practical experience working in a formal laboratory. This document does not address all possible safety issues. Users are responsible for taking appropriate safety and health measures and ensuring compliance with relevant national regulations. 1.Scope This document describes a method for determining the aluminum content in iron ore using EDTA titration. This document applies to the determination of aluminum content in natural iron ore, iron concentrate, sinter, and pellets. Determination range (mass fraction). 0.25%~5.00%.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included. For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies. This document. GB/T 601 Preparation of Standard Titration Solutions for Chemical Reagents GB/T 6682 Standard and test methods for water used in analytical laboratories (GB/T 6682-2008, ISO 3696.1987, MOD) GB/T 6730.1 Preparation of pre-dried samples for iron ore analysis (GB/T 6730.1-2016, ISO 7764.2006) MOD) GB/T 8170 Rules for rounding off numerical values and the representation and determination of limiting values GB/T 10322.1 Sampling and sample preparation methods for iron ore (GB/T 10322.1-2023, ISO 3082.2017, IDT) GB/T 12805 Burettes for Laboratory Glassware (GB/T 12805-2011, ISO 385.2005, NEQ) GB/T 12806 Laboratory glassware - Single-mark volumetric flasks (GB/T 12806-2011, ISO 1042.1998, NEQ) GB/T 12808 Laboratory Glassware - Single-mark Pipettes 3.Terms and Definitions This document does not contain any terms or definitions that need to be defined. 4.Principles The sample was decomposed with hydrochloric acid, nitric acid, and perchloric acid, and then filtered. The residue was evaporated with hydrofluoric acid to remove silicon, then fused with potassium pyrosulfate, extracted with hydrochloric acid, and then... The filtrates were combined. Then, the oxide R₂O₃ was precipitated with ammonia, filtered, and aluminum, iron, titanium, etc., were separated from other elements. Hydrogen hydroxide was dissolved in hydrochloric acid. The sample was then extracted with copper-iron reagent and chloroform to remove iron, titanium, and other elements, while aluminum remained in the aqueous phase. The aqueous phase was treated with nitric acid and perchloric acid and evaporated to dryness, then treated with salt. Dissolve in acid and dilute with water. Add excess disodium ethylenediaminetetraacetate (EDTA) to the solution to complex aluminum, and use xylenol orange as an indicator. The excess EDTA was back-titrated with a zinc standard titration solution. Then, the EDTA complexed with aluminum was replaced with sodium fluoride, and the solution was titrated again with a zinc standard titration solution. The EDTA displaced by liquid titration is used to determine the aluminum content. 5.Reagents Unless otherwise specified, reagents of analytical grade (or higher) and water conforming to grade III or higher as specified in GB/T 6682 should be used in the analysis. ...