GB/T 6730.20-2016 English PDF

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GB/T 6730.20-2016: Iron ores -- Determination of phosphorus content -- Titrimetric method
Status: Valid

GB/T 6730.20: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 6730.20-2016	199	Add to Cart	3 days	Iron ores -- Determination of phosphorus content -- Titrimetric method	Valid
GB/T 6730.20-1986	279	Add to Cart	3 days	Methods for the chemical analysis of iron ores. The volumetric method for the determination of phosphorus content	Obsolete

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GB/T 6730.28   GB/T 6730.2   GB/T 6730.11   GB/T 6730.23   GB/T 6730.24   GB/T 6730.25   

Basic data

Standard ID: GB/T 6730.20-2016 (GB/T6730.20-2016)
Description (Translated English): Iron ores -- Determination of phosphorus content -- Titrimetric method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: D31
Classification of International Standard: 73.060
Word Count Estimation: 10,150
Date of Issue: 2016-10-13
Date of Implementation: 2017-09-01
Older Standard (superseded by this standard): GB/T 6730.20-1986
Regulation (derived from): National Standard Notice No.1716 of 2016
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China

GB/T 6730.20-2016: Iron ores -- Determination of phosphorus content -- 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 - Determination of phosphorus content - Titrimetric method ICS 73.060.10 D31 National Standards of People's Republic of China Replacing GB/T 6730.20-1986 Determination of phosphorus content in iron ore - Titration method 2016-10-13 released 2017-09-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China China National Standardization Management Committee released

Foreword

GB/T 6730 "iron ore" is divided into dozens of parts. This part is part 20 of GB/T 6730. This part is drafted in accordance with the rules given in GB/T 1.1-2009. This part of the GB/T 6730.20-1986 "iron ore chemical analysis method volumetric determination of phosphorus", this part and GB/T 6730.20-1986 In addition to editorial changes, the main technical changes are as follows. --- increase the warning, normative reference documents, test reports; --- increase the concentration of nitric acid titration solution formula; --- increased the requirements of the instrument; --- modified the sample decomposition process, the expression of the residue handling operation; --- increase the titanium content of more than 18mg of the sample residue treatment operation; An increase in the 8.3 oxide coefficient. This part is made by China Iron and Steel Industry Association. This section is headed by the National Commission on Standardization of Iron Ore and Direct Reductive Iron (SAC/TC317). This part of the drafting unit. Anshan Iron and Steel Mining Group, Shougang Technology Research Institute, Ningbo Entry-Exit Inspection and Quarantine Bureau, Anshan Iron and Steel Co., Ltd. Sand mining and Metallurgy Research Institute limited liability company, Metallurgical Industry Information Standards Institute. The main drafters of this part. Li Yulin, Chen Zhihua, Gao Jingjun, Shen Hengchang, Sun Deming, Zhang Lei, Sun Lijun, Chen Zhibin. This part of the previous version of the standard to replace the release of the situation. --- GB/T 6730.20-1986. Determination of phosphorus content in iron ore - Titration method WARNING - Personnel using this section should have practical experience in formal laboratory work. This section does not indicate all possible security questions question. It is the responsibility of the user to take appropriate safety and health measures and to ensure compliance with the conditions set forth in the relevant national regulations.

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, ρ = 1.19 g/mL. 4.4 Hydrochloric acid, 1 4. 4.5 nitric acid, ρ = 1.42 g/mL. 4.6 nitric acid, 2 100. 4.7 perchloric acid, ρ = 1.67 g/mL. 4.8 sulfuric acid, ρ = 1.84 g/mL. ......

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