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GB/T 8704.6-2020: Ferrovanadium--Determination of silicon content--The sulfuric acid dehydration gravimetric method and the silicomolybdic blue photometric method
Status: Valid GB/T 8704.6: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 8704.6-2020 | English | 259 |
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Ferrovanadium--Determination of silicon content--The sulfuric acid dehydration gravimetric method and the silicomolybdic blue photometric method
| Valid |
GB/T 8704.6-2020
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| GB/T 8704.6-2007 | English | 199 |
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Ferrovanadium -- Determination of silicon content -- The sulphuric acid dehydration gravimetric method
| Obsolete |
GB/T 8704.6-2007
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| GB/T 8704.6-1994 | English | 199 |
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Methods for chemical analysis of ferrovanadium. The sulphuric acid dehydration-gravimetric method for the determination of silicon content
| Obsolete |
GB/T 8704.6-1994
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PDF similar to GB/T 8704.6-2020
Basic data | Standard ID | GB/T 8704.6-2020 (GB/T8704.6-2020) | | Description (Translated English) | Ferrovanadium--Determination of silicon content--The sulfuric acid dehydration gravimetric method and the silicomolybdic blue photometric method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H11 | | Classification of International Standard | 77.100 | | Word Count Estimation | 14,173 | | Date of Issue | 2020-06-02 | | Date of Implementation | 2020-09-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 8704.6-2020: Ferrovanadium--Determination of silicon content--The sulfuric acid dehydration gravimetric method and the silicomolybdic blue photometric 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.
(Ferrovanadium Determination of silicon content Sulfuric acid dehydration gravimetric method and silicon molybdenum blue spectrophotometric method)
ICS 77.100
H11
National Standards of People's Republic of China
GB/T 8704.6-2007
Determination of vanadium iron silicon content by sulfuric acid dehydration
Gravimetric method and silicon molybdenum blue spectrophotometry
2020-06-02 release
2020-09-01 implementation
State Administration of Market Supervision and Administration
Issued by the National Standardization Management Committee
Foreword
GB/T 8704 Fe-Vanadium analysis method is divided into the following 8 parts 1).
---Determination of vanadium iron carbon content Infrared absorption method and gas volume method (GB/T 8704.1);
---Determination of vanadium iron and sulfur content Infrared absorption method and combustion neutralization titration method (GB/T 8704.3);
---Determination of vanadium iron vanadium content ammonium ferrous sulfate titration method and potentiometric titration method (GB/T 8704.5);
---Determination of vanadium iron silicon content by sulfuric acid dehydration gravimetric method and silicon molybdenum blue spectrophotometry (GB/T 8704.6);
---Determination of vanadium-iron-phosphorus content Molybdenum blue spectrophotometry (GB/T 8704.7);
---Determination of the content of vanadium, iron and aluminum by chrome azurol S spectrophotometry and EDTA titration method (GB/T 8704.8);
---Determination of vanadium iron manganese content potassium periodate photometric method and flame atomic absorption spectrometry (GB/T 8704.9);
---Determination of vanadium iron silicon, manganese, phosphorus, aluminum, copper, chromium, nickel, titanium content by inductively coupled plasma atomic emission spectrometry
(GB/T 8704.10).
This part is Part 6 of GB/T 8704.
This section was drafted in accordance with the rules given in GB/T 1.1-2009.
This part replaces GB/T 8704.6-2007 "Determination of vanadium-iron-silicon content by sulfuric acid dehydration gravimetric method". This section is related to
Compared with GB/T 8704.6-2007, the main technical changes are as follows.
--- Modified the content of normative references (see Chapter 2, Chapter 2 of the.2007 edition);
--- Added "instrument" (see 3.3);
--- Added "Verification Test" (see 3.5.4);
--- Added "Determining and Representing Analysis Results" (see 3.6.2);
--- Replace the allowable difference with the repeatability limit r and reproducibility limit R (see Chapter 8 of 3.7,.2007 edition);
--- Added silicon molybdenum blue spectrophotometry (see Chapter 4);
--- Added Appendix A and Appendix B.
This part is proposed by China Iron and Steel Association.
This part is under the jurisdiction of the National Pig Iron and Ferroalloy Standardization Technical Committee (SAC/TC318).
This section was drafted by. Pangang Group Co., Ltd., Hebei Iron and Steel Chengde Vanadium and Titanium New Materials Co., Ltd., National Vanadium and Titanium Products Quality Supervision and Inspection
Center, Beijing China Metallurgical Equipment Research and Design Institute Co., Ltd., Qingdao Zhongkelian Laboratory Technology Service Co., Ltd., Jiaocheng Yiwang Ferroalloy have
Limited liability company, Metallurgical Industry Information Standards Institute.
The main drafters of this section. Yang Xinneng, Feng Zongping, Liu Chaoyang, Zhou Kaizhu, Li Xiaoqing, Bo Fenghua, Zheng Xiaomin, Luo Ping, Li Lanjie,
Yang Shaosong, Yang Dajun, Cheng Yong, Xu Benping, Gao Minglei, Sun Yongmei, Lu Chunsheng.
The previous versions of the standard replaced by this part are as follows.
---GB/T 8704.6-1994, GB/T 8704.6-2007.
1) GB/T 8704.2-1988 and GB/T 8704.4-1988 have been abolished.
Determination of vanadium iron silicon content
Sulfuric acid dehydration gravimetric method and silicon molybdenum blue spectrophotometry
Warning --- People who use this part should have practical experience in formal laboratory work. This section does not indicate all possible safety issues
question. It is the user's responsibility to take appropriate safety and health measures and to ensure compliance with the conditions prescribed by the relevant national regulations.
1 Scope
This part of GB/T 8704 specifies sulfuric acid dehydration gravimetric method and silicon molybdenum blue spectrophotometric determination of silicon content.
This section applies to the determination of silicon content in iron vanadium, the determination range (mass fraction). 0.10% ~ 3.50%.
2 Normative references
The following documents are essential for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For the cited documents without date, the latest version (including all amendments) applies to this document.
Selection and preparation of GB/T 4010 samples for chemical analysis of ferroalloys
GB/T 6379.1 Accuracy of measurement methods and results (correctness and precision) Part 1.General rules and definitions
GB/T 6379.2 Accuracy of measurement methods and results (correctness and precision) Part 2.Determination of repetition of standard measurement methods
Basic methods of sex and reproducibility
GB/T 6682 Analysis of laboratory water specifications and test methods
GB/T 8170 Numerical Rounding Rules and Representation and Judgment of Limit Values
GB/T 12806 Laboratory glass instrument single mark volumetric flask
GB/T 12807 Laboratory glass instrument graduation pipette
GB/T 12808 Laboratory glass instrument single mark pipette
3 Method 1.Sulfuric acid dehydration gravimetric method
3.1 Principle
The sample is decomposed with nitric acid and hydrochloric acid, the fumes are evaporated with sulfuric acid to dehydrate the silicic acid, the soluble salts are dissolved with hydrochloric acid, the precipitate is separated, and washed by filtration
After cleaning, the precipitate is burned to a constant amount at 1050°C. Hydrofluoric acid is added to volatilize and remove the silicon with silicon tetrafluoride.
The quality before and after the treatment is poor, and the silicon content is calculated.
3.2 Reagents and materials
Unless otherwise specified in the analysis, only approved analytically pure reagents and grade III and above distilled water in accordance with GB/T 6682 are used
Or deionized water or water of equivalent purity.
3.2.1 Hydrochloric acid, ρ1.19g/mL.
3.2.2 Hydrochloric acid, 14.
3.2.3 Hydrochloric acid, 1 10.
3.2.4 Nitric acid, 1 1.
3.2.5 Hydrofluoric acid, ρ1.15g/mL.
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