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GB/T 5687.2: Historical versions
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| GB/T 5687.2-2007 | English | 159 |
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Ferrochromium, silicon chromium and nitrogen-bearing ferrochromium -- Determination of silicon content -- The perchloric acid dehydration gravimetric method
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| GB/T 5687.2-1985 | English | 199 |
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Methods for chemical analysis of ferro-chromium--The gravimetric method for the determination of silicon content
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Basic data
| Standard ID | GB/T 5687.2-2007 (GB/T5687.2-2007) |
| Description (Translated English) | Ferrochromium, silicon chromium and nitrogen-bearing ferrochromium -- Determination of silicon content -- The perchloric acid dehydration gravimetric method |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | H11 |
| Classification of International Standard | 77.100 |
| Word Count Estimation | 6,645 |
| Date of Issue | 2007-09-11 |
| Date of Implementation | 2008-02-01 |
| Older Standard (superseded by this standard) | GB/T 4699.1-1984; GB/T 5687.2-1985 |
| Quoted Standard | GB/T 4010 |
| Regulation (derived from) | China National Standard Approval Announcement2007 No.11 (Total No.111) |
| 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 determination of silicon content with perchloric acid dehydration gravimetric method. Warning-Use this section personnel should experience regular laboratory work. This section does not indicate that all possible safety problems. Users are responsible for taking appropriate safety and health practices and to ensure compliance with the relevant national regulations. This section applies to chromium iron, determination of silicon nitride, chromium and chromium alloys of silicon content, vacuum micro- carbon ferrochrome. Measuring range (mass fraction): 0. 10 %-60. 00%. |
GB/T 5687.2-2007: Ferrochromium, silicon chromium and nitrogen-bearing ferrochromium -- Determination of silicon content -- The perchloric acid dehydration gravimetric 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.
Ferrochromium, silicochromium and nitrogen-bearing ferrochromium. Determination of silicon content. The perchloric acid dehydration gravimetric method
ICS 77.100
H11
National Standards of People's Republic of China
Replacing GB/T 4699.1-1984, GB/T 5687.2-1985
Determination of chromium iron, chrome and silicon nitride ferrochrome silicon content
Perchloric acid dehydration gravimetric method
Posted 2007-09-11
2008-02-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This section GB/T 5687 instead of GB/T 4699.1-1984 "silicon alloy chemical analysis of gravimetric method for determination of silicon content" and
"Ferrochromium chemical determination of silicon content - Gravimetric method" GB/T 5687.2-1985.
This portion of the GB/T 4699.1-1984 and GB/T 5687.2-1985 comparison, the main changes are as follows.
--- Measured by the range 1.00% - 6.00% chromium, and 8.00% ~ 95.00% SILICOCHROMIUM adjusted to 0.10% - 60.00%;
--- Firing temperature precipitate twice by 1100 ℃ to 1050 ℃;
--- For high-carbon ferrochrome, by the size of the sample through a sieve to 0.125mm by 0.088mm sieve;
--- Flux adjusted with the amount of volume, the melting temperature and perchloric acid;
--- The filtrate was recovered and a second dehydration.
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. Sichuan Investment Emei Ferroalloy (Group) Co., Ltd.
The main drafters of this section. should Tang Hua, Fang Yan.
This part of the standard replaces the previous editions are.
--- GB/T 4699.1-1984;
--- GB/T 5687.2-1985.
Determination of chromium iron, chrome and silicon nitride ferrochrome silicon content
Perchloric acid dehydration gravimetric method
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 5687 provisions of this part of the determination of silicon content by perchloric acid dehydration gravimetric method.
This section applies to the determination of chromium iron, vacuum micro-carbon ferrochrome, chromium nitride and silicon ferrochrome alloy silicon content measurement range (mass fraction).
0.10% - 60.00%.
2 Normative references
The following documents contain provisions which, through reference to GB/T 5687 this section, constitute provisions of this part. 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 4010 alloy chemical analysis and preparation of samples
Principle 3
After the sample is dissolved with hydrochloric acid or alkali fusion, the melt is dissolved in hydrochloric acid, perchloric acid fume treatment, the silicon becomes insoluble silicate. Filtered
After washing, the precipitate was calcined at 1050 deg.] C to constant weight, hydrofluoric acid is added so that the silicon was removed by volatilization of silicon tetrafluoride, and then calcined to constant weight, hydrofluoric acid
Poor quality before and after treatment, to calculate the percentage of silicon.
4 Reagents and materials
Unless otherwise indicated in the analysis using only recognized as analytical grade reagents and distilled water or its equivalent purity water.
4.1 sodium peroxide, solid.
4.2 anhydrous sodium carbonate solids.
4.3 ammonia, ρ0.90g/mL.
4.4 perchloric acid, ρ1.67g/mL.
4.5 hydrochloride, ρ1.19g/mL.
4.6 HCl, 1 + 5.
4.7 HCl, 1 + 9.
4.8 Hydrogen peroxide, ρ1.10g/mL.
4.9 hydrofluoric acid, ρ1.15g/mL, pure class distinctions.
4.10 sulfate, 1 + 1.
4.11 ammonium thiocyanate solution, 50g/L.
4.12 silver nitrate solution, 10g/L.
5 Sampling and Preparation
In accordance with the provisions of GB/T 4010 will be sampling and sample preparation. High-carbon ferrochrome, chromium nitride sample shall adopt 0.088mm sieve, silicon-chromium alloy
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