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GB/T 7731.12-2008: Ferrotungsten -- Determination of sulfur content -- Infrared absorption method and combustion titration method
Status: Valid GB/T 7731.12: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 7731.12-2008 | English | 229 |
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Ferrotungsten -- Determination of sulfur content -- Infrared absorption method and combustion titration method
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GB/T 7731.12-2008
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| GB/T 7731.12-1988 | English | 199 |
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Methods for chemical analysis of ferrotungsten--The infrared absorption method for the determination of sulfur content
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GB/T 7731.12-1988
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Basic data | Standard ID | GB/T 7731.12-2008 (GB/T7731.12-2008) | | Description (Translated English) | Ferrotungsten -- Determination of sulfur content -- Infrared absorption method and combustion titration method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H11 | | Classification of International Standard | 77.100 | | Word Count Estimation | 10,121 | | Date of Issue | 2008-05-13 | | Date of Implementation | 2008-11-01 | | Older Standard (superseded by this standard) | GB/T 7731.12-1988; GB/T 7731.13-1988 | | Quoted Standard | GB/T 4010 | | Regulation (derived from) | National Standard Approval Announcement 2008 No.8 (Total No.121) | | 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 | | Summary | This standard specifies the use of infrared absorption method and combustion and sulfur content measured by titration. This section applies to the determination of sulfur content of tungsten iron. Measuring range (mass fraction) infrared absorption method: 0. 0050% ~ 0. 25%, measurement range (mass fraction) combustion and titration: 0. 0050% to 0. 25 %. | GB/T 7731.12-2008: Ferrotungsten -- Determination of sulfur content -- Infrared absorption method and combustion titration method
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Ferrotungsten. Determination of sulfur content. Infrared absorption method and combustion titration method
ICS 77.100
H11
National Standards of People's Republic of China
Replacing GB/T 7731.12-1988, GB/T 7731.13-1988
Determination of tungsten iron sulfur content
The infrared absorption method and combustion titration method
Posted 2008-05-13
2008-11-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This part is the "Determination of sulfur content of tungsten iron chemical analysis of infrared absorption method" GB/T 7731.12-1988,
GB/T 7731.13-1988 "tungsten iron chemical analysis of combustion and determination of sulfur content titration" integration amendment.
This Part replaces GB/T 7731.12-1988 "iron chemical analysis of tungsten infrared absorption method for determination of sulfur content"
GB/T 7731.13-1988 "tungsten iron chemical analysis of combustion and determination of sulfur content titration."
This portion of the GB/T 7731.12-1988 and GB/T 7731.13-1988 comparison, the main changes are as follows.
--- Determine the detection limit of combustion and titration of 0.0050%;
--- Modify the burning and allow titration method;
--- Infrared absorption method detection limit of 0.015% by revised to 0.0050%;
--- Modified infrared absorption method allows the poor.
This part is proposed by the China Iron and Steel Association.
This section is under the jurisdiction of Metallurgical Industry Information Standards Institute.
This section is drafted. Sinosteel Jilin Ferroalloy Co., Ltd.
The main drafters of this section. Yang Fan Liya Hua, in Guiping.
This part of the standard replaces the previous editions are.
--- GB/T 7731.12-1988;
--- GB/T 7731.13-1988.
Determination of tungsten iron sulfur content
The infrared absorption method and combustion titration method
Warning. Use of this section shall be a person experiences regular laboratory work. This section does not indicate that all possible security issues.
Users have the responsibility to take appropriate safety and health practices and to ensure compliance with the conditions relevant national regulations.
1 Scope
This section provides the infrared absorption method and the determination of sulfur content and combustion titration method.
This section applies to the determination of sulfur content of tungsten iron, infrared absorption measurement range (mass fraction) Law. 0.0050% - 0.25%; combustion
Neutralization titration measurement range (mass fraction). 0.0050% to 0.25%.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of this part. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this section, however, encourage the parties to this part of the research agreement
Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this section.
GB/T 4010 alloy chemical analysis and preparation of samples
3 a method of infrared absorption method
3.1 Principle
A high frequency induction furnace to sample the combustion heating oxygen flow, the oxygen produced by the sulfur dioxide contained in the measuring chamber to the infrared analyzer dioxide
S absorption of a specific wavelength of infrared energy absorbed is proportional to its concentration can, according to the detector to accept the change in energy can be measured sulfur content.
3.2 Reagents and materials
3.2.1 Magnesium perchlorate anhydrous particles.
3.2.2 asbestos caustic soda, granular.
3.2.3 glass wool.
3.2.4 tungsten particles, sulfur content is less than 0.0002%, particle size 0.8mm ~ 1.4mm.
3.2.5 tin particles, the amount of carbon is less than 0.0003%, particle size of 0.4mm ~ 0.8mm.
3.2.6 pure iron purity of more than 99.80%, sulfur content less than 0.002%, particle size 0.8mm ~ 1.68mm.
3.2.7 oxygen purity of more than 99.95%, if other levels of oxygen to obtain a low and consistent blank, can also be used.
3.2.8 power source gas, nitrogen and compressed air, the impurities (water and oil) content of less than 0.5%.
3.2.9 ceramic crucible, × h (mm), 23 × 23 or 25 × 25, and at more than 1200 ℃ high temperature furnace burning 4h or through burning oxygen
Till the blank is the lowest.
3.2.10 crucible tongs.
3.3 instruments and equipment
3.3.1 Sulphur infrared absorption analyzer (sensitivity of 1 × 10-6)
Its apparatus shown in Figure 1.
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