GB/T 6730.20-2016Iron ores - Determination of phosphorus content - Titrimetric method (English PDF)
铁矿石 磷含量的测定 滴定法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
October 13, 2016
Implementation date
September 1, 2017
Scope
GB/T 6730.20-2016 is the English-translated version of 铁矿石 磷含量的测定 滴定法.
GB/T 6730.20-2016 is the Chinese standard "Iron ores - Determination of phosphorus content - Titrimetric method". Its scope clause reads: This part of GB/T 6730 specifies the determination of phosphorus content by acid-base titration.
This section applies to the determination of phosphorus content in iron ore, iron concentrate, sinter and pellets. Determination range (mass fraction). 0.030% ~ 3.0%. Its clauses include normative reference documents; principle; reagent.
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Document preview — GB/T 6730.20-2016
National Standard of the People's Republic of China
- ICS
- 73.060.10
- Classification
- D 31
- Replacing
- GB/T 6730.20-1986
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- 1 Scope
- 2 normative reference documents
- 3 principle
- 4 reagent
1 Scope
This part of GB/T 6730 specifies the determination of phosphorus content by acid-base titration.
This section applies to the determination of phosphorus content in iron ore, iron concentrate, sinter and pellets. Determination range (mass fraction). 0.030% ~
3.0%.
2 normative reference documents
The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this article
Pieces. For undated references, the latest edition (including all modifications) applies to this document.
GB/T 6682 Analytical laboratory water specifications and test methods
Preparation of pre - dried samples for analysis of iron ore GB/T 6730.1
Representation and Judgment of Numerical Correction Rule and Limit Value of GB/T 8170
GB/T 10322.1 Iron Ore Sampling and Sample Preparation
GB/T 12806 laboratory glass instrument single standard line capacity bottle
GB/T 12808 Laboratory glass instruments Single line pipettes
3 principle
Samples with hydrochloric acid, nitric acid, perchloric acid decomposition, filtration, the filtrate as the main liquid retention. Residue with hydrofluoric acid in addition to silicon, sodium carbonate melting, with dilute salt
After acid leaching, add ferric chloride, with ammonia precipitation method to recover phosphorus, precipitate dissolved in hydrochloric acid, mixed with the main liquid together. In the presence of moderate amounts of nitric oxide
Acid and ammonium nitrate conditions, adding ammonium molybdate to produce ammonium phosphomolybdate precipitation. The precipitate is dissolved in excess sodium hydroxide standard solution and is labeled with nitric acid
The solution was titrated with excess sodium hydroxide to determine the phosphorus content.
4 reagent
In the analysis, unless otherwise specified, only approved analytical reagents and distilled water in accordance with GB/T 6682 or equivalent to its purity
Of water.
4.1
Sodium carbonate, anhydrous.
4.2
Sodium nitrate.
4.3
Hydrochloric acid, rho = 1.19 g/mL.
4.4
Hydrochloric acid, 1 4.
4.5
nitric acid, rho = 1.42 g/mL.
4.6
nitric acid, 2 100.
4.7
perchloric acid, rho = 1.67 g/mL.
4.8
sulfuric acid, rho = 1.84 g/mL.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Similar standards
Editions of GB/T 6730.20
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 6730.20-2016 | Iron ores - Determination of phosphorus content - Titrimetric method | current edition | Current |
| GB/T 6730.20-1986 | Iron ores - Determination of phosphorus content - Titrimetric method | previous edition | Superseded |
This page sells the current edition, GB/T 6730.20-2016. Earlier editions are listed for reference only.
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Related Standards
GB/T 6730.1-2016 — Iron ores -- Preparation of pre-dried test samples for chemical analysis
GB/T 6730.10-2014 — Iron ores -- Determination of silicon content -- Gravimetric methods
GB/T 6730.11-2025 — Iron ores - Determination of aluminium content - EDTA titrimetric method
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