GB/T 6730.11-2025 English PDF

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 6730.11-2025	RFQ	ASK	3 days	Iron ores - Determination of aluminium content - EDTA titrimetric method	Valid
GB/T 6730.11-2007	160	Add to Cart	Auto, < 3 mins	Iron ores -- Determination of aluminium content -- EDTA titrimetric method	Valid
GB/T 6730.11-1986	439	Add to Cart	4 days	Methods for chemical analysis of iron ores--The fluoride replacement complexometric method for the determination of aluminum content	Obsolete

Basic data

Standard ID: GB/T 6730.11-2025 (GB/T6730.11-2025)
Description (Translated English): Iron ores - Determination of aluminium content - EDTA titrimetric method
Sector / Industry: National Standard (Recommended)
Date of Implementation: 2026-03-01
Older Standard (superseded by this standard): GB/T 6730.11-2007

GB/T 6730.11-2007: Iron ores -- Determination of aluminium content -- EDTA titrimetric 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. Determiantion of aluminium content. EDTA titrimetric method ICS 73.060.10 D31 National Standards of People's Republic of China Replacing GB/T 6730.11-1986 Determination of aluminum content of iron ore EDTA titration (ISO 6830. 1986, MOD) Posted 2007-08-14 2008-03-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

GB/T 6730 to modify the use of this part of ISO 6830. 1986 "Determination of the amount of aluminum ore complexometric titration", and this section ISO 6830. 1986 Comparison major amended as follows. --- "2 Normative references" by our standards instead of the corresponding international standards; --- ISO 6830. 1986 4.17 "zinc standard solution" with a zinc preparation, concentration 0.01000mol/L, this section is amended as oxygen Zinc preparation, the concentration revised to 0.02000mol/L or 0.01000mol/L; --- ISO 6830. 1986 7.5.1 "sample decomposition", the use of sodium carbonate in a glassy carbon crucible or zirconium crucibles of molten sample decomposition. This section is amended as sample with hydrochloric acid, nitric acid, perchloric acid decomposition, filtration; hydrofluoric acid residue was removed by evaporation after the silicon with potassium pyrosulfate Melting, hydrochloric acid extracts were combined with the filtrate; --- ISO 6830. 1986 7.5.2 "Separation of interfering elements", using ammonia precipitation R2O3 and chloroform extraction and CUPFERRON Separating interfering elements. This part of our country containing rare earth elements, iron ore, after more than two separation steps, adding a strong base isolated in Eliminate the interference of rare earth elements. This modification is only for iron ore containing rare earth elements; --- ISO 6830. 1986 7.5.3 "titration", using ammonium fluoride replaced with aluminum complexed EDTA. This section is amended as sodium fluoride Replaced with aluminum complexed EDTA; In addition, the adjustment of the acidity of the way, acetate buffer amount added to the order as well as complex and set When the boiling time for this part also made some changes. This Part replaces GB/T 6730.11-1986 "method of chemical analysis of iron fluoride replacement complexometric method for the determination of aluminum content." Headquarters Points compared with the GB/T 6730.11-1986, main changes are as follows. --- GB/T 6730.11-1986 4.5.2 "separation", a "methyl isobutyl ketone extraction and separation", "hexamethylenetetramine separation" and Three steps "alkali separation" and separation of interfering elements. This section is amended as ordinary iron ore using "ammonia separation" and "CUPFERRON Extraction of "two steps separating interfering elements; iron ore containing rare earth elements is increased" alkali Separation "; --- GB/T 4.2 "sample quantity" 6730.11-1986 of Weigh 1g or 0.5g sample. This section is amended as weighing 0.3g or 0.2g sample; --- GB/T 6730.11-1986 4.5.3 "titration" from 250mL alkaline solution dispensation 100mL test solution was titrated. The partial modification for the whole amount of the titration (except iron ore containing rare earth elements). Appendix A of this section is normative appendix, Appendix B and Appendix C are informative appendices. This part is proposed by the China Iron and Steel Association. This section is under the jurisdiction of Metallurgical Industry Information Standards Institute. This part mainly drafted by. Sinosteel Maanshan Institute of Mining Research. The main drafters of this section. Zhang Nianci, Shao Hua Guang. This part of the standard replaces the previous editions are. --- GB/T 6730.11-1986. Determination of aluminum content of iron ore EDTA titration Warning --- Use this section shall be a person experiences regular laboratory work. This section does not point out all possible security asked question. Users have the responsibility to take appropriate safety and health practices and to ensure compliance with the conditions relevant national regulations.

1 Scope

GB/T 6730 This section provides the determination of aluminum content by EDTA titration. This section applies to natural iron ore, the determination of iron ore, sinter and pellets of aluminum content; measurement range (mass fraction). 0.25% to 5.0%.

2 Normative references

The following documents contain provisions which, through reference to GB/T 6730 to the present, constitute provisions of this section. For dated reference documents Member, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouraged to reach under this section Parties to research agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this section. GB/T 6682 analytical laboratory use specifications and test methods (GB/T 6682-1992, neq ISO 3697. 1987) GB/T 6730.1 Methods for chemical analysis of iron pre-drying of the sample preparation (GB/T 6730.1-1986 use, eqv ISO 7764. 1985) GB/T 10322.1 iron ore sampling and sample preparation method (GB/T 10322.1-2000, idt ISO 3082.1998) GB/T 12806 Laboratory glassware Single Groove flask (GB/T 12806-1991, neq ISO 1042. 1983) GB/T 12808 Laboratory glassware Single Groove pipette (GB/T 12808-1991, neq ISO 648. 1977) Principle 3 Specimens with hydrochloric acid, nitric acid, perchloric acid decomposition, filtration. After evaporation the residue with hydrofluoric acid to remove the silicon melt coke potassium sulfate, hydrochloric acid and extracted with Filtrate. Then precipitated with ammonia R2O3, filtered, aluminum, iron, titanium, etc. separated from other elements. Hydroxide dissolved with hydrochloric acid, and then copper Ferron and chloroform extraction of iron and other elements titanium, aluminum remains in the aqueous phase. The aqueous phase was nitric acid and perchloric acid and evaporated to dryness, dissolved in hydrochloric acid, add Diluted with water. An excess of EDTA complexed aluminum in solution, then xylenol orange as indicator drops back to an excess of zinc standard titration solution EDTA. Then replaced with aluminum complexed sodium EDTA, zinc standard titration solution and then titrated to displace the EDTA.

4 Reagents

Analysis Unless otherwise stated, use only reagents of recognized analytical grade and distilled water or equivalent purity of its water, in line with GB/T 6682 Provisions. 4.1 potassium pyrosulfate. 4.2 hydrochloride, ρ1.19g/mL. HCl 4.3, 1 + 1. 4.4 HCl, 5 + 95. 4.5 nitric acid, ρ1.42g/mL. 4.6 perchloric acid, ρ1.67g/mL. 4.7 hydrofluoric acid, ρ1.15g/mL. ......

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