GB/T 6730.13: Evolution and historical versions
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| GB/T 6730.13-2025 | English | RFQ |
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Iron ores - Determination of calcium and magnesium content - EGTA-CyDTA titrimetric method
| Valid |
GB/T 6730.13-2025
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| GB/T 6730.13-2007 | English | 259 |
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Iron ores -- Determination of aluminium content -- EDTA-CyDTA titrimetric method
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GB/T 6730.13-2007
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| GB/T 6730.13-1986 | English | 239 |
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Methods for chemical analysis of iron ores--The potassium permanganate volumetric method for the determination of calcium content
| Obsolete |
GB/T 6730.13-1986
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Basic data | Standard ID | GB/T 6730.13-2025 (GB/T6730.13-2025) | | Description (Translated English) | Iron ores - Determination of calcium and magnesium content - EGTA-CyDTA titrimetric method | | Sector / Industry | National Standard (Recommended) | | Date of Implementation | 2026-03-01 | | Older Standard (superseded by this standard) | GB/T 6730.13-2007 | GB/T 6730.13-2007: Iron ores -- Determination of aluminium content -- EDTA-CyDTA titrimetric method---This is a DRAFT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-CyDTA titrimetric method
ICS 73.060.10
D31
National Standards of People's Republic of China
Replacing GB/T 6730.13-1986, GB/T 6730.15-1986
Determination of calcium and magnesium content in iron ore
EGTA-C y DTA titration
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
Determination of calcium GB/T 6730 this part instead of GB/T 6730.13-1986 "method of chemical analysis of iron potassium permanganate volumetric method
Amount "and GB/T 6730.15-1986" iron chemical analysis of complex titration of magnesium content. "
This portion of the GB/T 6730.13-1986, GB/T 6730.15-1986 comparison, the main changes are as follows.
--- GB/T 6730.13-1986 and GB/T 6730.15-1986 respectively determination of calcium and magnesium content, and this part of the method is the same time
Determination of calcium and magnesium content;
--- GB/T 6730.13-1986 use of potassium permanganate standard solution, this section is amended as EGTA standard solution;
GB/T 6730.15-1986 using EDTA standard solution, this section is amended as CyDTA standard solution;
Concentration --- GB/T 6730.15-1986 of 2.30 Mg standard solution of 1mL containing 1.00mg, this section is amended as 1mL
Containing 0.30mg; GB/T 6730.13-1986 in 2.16.2 calibrated using sodium oxalate, calcium oxide to modify this part of the calibration;
--- GB/T 6730.15-1986 Determination of 4.5, this section is not adopted;
--- GB/T 6730.13-1986 two ammonia separation in 4.5.3, this section is amended as ammonia twice - potassium joint separation.
This section of Appendix A normative appendix.
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.
This part drafters. Zeng Shen Jin, Xuxiu Ping, Zhang Xian only.
This part of the standard replaces the previous editions are.
--- GB/T 6730.13-1986;
--- GB/T 6730.15-1986.
Determination of calcium and magnesium content in iron ore
EGTA-C y DTA 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 specifies the determination of calcium and magnesium content by EGTA-CyDTA titration.
This section applies to natural iron ore, iron ore measuring, sinter and pellets of calcium and magnesium content; measurement range (mass fraction). Calcium
Content. 1.5% to 15.0%, Mg content. > 1.0%.
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 3696. 1987)
GB/T 6730.1 Methods for chemical analysis of iron pre-dried sample was prepared using (GB/T 6730.1-1986,
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
Samples with hydrochloric acid, nitric acid decomposition, filtration; the residue with hydrofluoric acid to remove silicon after (except fluorine-containing sample), potassium pyrosulfate melt. With ammonia hydroxide
Iron, potassium, aluminum, titanium precipitate as a hydroxide, ammonium persulfate and manganese oxide as places hydrated manganese dioxide was removed by filtration and the hydroxide simultaneously, this
Phosphorus in the form of iron phosphate are simultaneously separated.
When the pH value is greater than 12, calcium indicators were used and EGTA standard titration solution titration of calcium. At pH = 10 with EGTA network
After closing calcium, plus chrome black T indicator, with CyDTA standard titration solution titration magnesium.
4 Reagents and materials
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 ammonium persulfate.
4.3 hydrochloride, ρ1.19g/mL.
HCl 4.4, 1 + 1.
4.5 hydrochloric acid, 5 + 95.
Sulfate 4.6, 1 + 1.
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