GB/T 4701.2-1984 Chemical analysis methods for ferrotitanium - Gravimetric method for determination of silicon content

GB/T 4701.2-1984 Chemical analysis methods for ferrotitanium - Gravimetric determination of silicon content GB/T4701.2-1984 Standard download decompression password: www.bzxz.net

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Methods for chemical analysis of ferrotitaniumThe grarimetric method for the determinationof silicon content
This standard is applicable to the determination of silicon content in ferrotitanium. Determination range: 1.00～6.00%. UDC 669.15'295
1543.21 :546
GB 4701.2—84
This standard complies with GB1467-78 "General Principles and General Provisions of Standards for Chemical Analysis Methods of Metallurgical Products". 1 Summary of the method
The sample is dissolved in sulfuric acid and hydrochloric acid, oxidized with hydrogen peroxide, and the solution is evaporated to sulfuric acid fumes to dehydrate the silicic acid, which is filtered and burned to silicon dioxide. Then treat with sulfuric acid and hydrofluoric acid to make silicon escape as silicon tetrafluoride. Calculate the silicon content by the mass difference before and after the hydrofluoric acid.
2 Reagents
2.1 Hydrocarboxylic acid (specific gravity 1.19).
2.2 Hydrofluoric acid (specific gravity 1.15).
2.3 Hydrogen peroxide (specific gravity 1.1).
2.4 Sulfuric acid (1+1).
2.5 Sulfuric acid (1+4).
2.6 Washing liquid, transfer 20ml hydrochloric acid (2.1) into 960ml water, mix, add 20ml hydrogen peroxide (2.3), mix well. 3 Sample
The sample should pass through a 0.125mm sieve.
4 Analysis steps
4.1 Sample quantity
Weigh 1.0000g of sample.
4.2 Blank test
Carry out a blank test with the sample.
4.8 Determination
4.3.1 Place the sample (4.1) in a 500ml beaker, add 100ml sulfuric acid (2.5), then slowly add 30ml hydrochloric acid (2.1) in portions, cover with Table III, heat until the sample is completely dissolved, remove and cool, slowly add 10ml hydrogen peroxide (2.3) to oxidize titanium, heat for about 5 minutes until sulfuric acid smoke is emitted, remove and cool. 4.3.2 Add 20ml hydrochloric acid (2.1) and 200ml hot water, heat to dissolve soluble salts, boil for 1 minute, remove and filter immediately with medium-speed quantitative filter paper, wipe off the precipitate attached to the wall of the beaker with a wiper, first clean the beaker with warm detergent (2.6), and wash the precipitate and filter paper until there is no pertitanic acid color, and then wash with warm water until neutral. 4.3.3 Heat the filtrate and washing liquid (4.3.2) at low temperature until sulfuric acid smoke appears for about 5 m/s, remove and cool slightly. The following shall be carried out in accordance with 4.3.2. National Bureau of Standards Issued on October 4, 1984
Implementation on September 1, 1985
GB 4701.2-84
4.3.4 Place the precipitate obtained from the two times together with the filter paper (4.3.2 and 4.3.3) in an aluminum crucible, slowly heat until the filter paper is ashed, place in a high-temperature furnace and burn at 1100℃ for 30 minutes, remove and cool slightly, place in a desiccator, cool to room temperature, weigh its mass and repeatedly burn until constant mouse (m).
4.3.5 Add 2-3 drops of sulfuric acid (2.4) to the residue (4.3.4) to moisten the residue, add 5 ml of hydrochloric acid (2.2), heat at low temperature to remove sulfuric acid fumes, then place in a high temperature furnace and burn at 1100℃ for 15 min. Take out and cool slightly, place in a desiccator, cool to room temperature, weigh its mass and repeatedly burn until constant weight (m2). 5 Calculation of analysis results
Calculate the percentage of silicon by the following formula:
si(%) =-
[(mi -m2) -(mg -m,)]x0.4674
Wherein: ml——the mass of impure silicon dioxide and platinum crucible measured in 4.3.4, glm
-the mass of the residue and platinum crucible measured in 4.3.5, g;-the mass of impure silicon dioxide and platinum measured in the blank test, g: m
m.—the mass of the residue and platinum crucible measured in the blank test, gi-the sample size, g
-the conversion factor of silicon dioxide to silicon. The analysis results are expressed to two decimal places. 6 Tolerance
The difference in analysis results between laboratories should not be greater than the allowable difference listed in the following table. Silicon
Additional Notes:
This standard is proposed by the Ministry of Metallurgical Industry of the People's Republic of China. This standard is drafted by Jinzhou Ferroalloy Factory of the Ministry of Metallurgical Industry. ×100
Allowance
From the date of implementation of this standard, the former Ministry of Metallurgical Industry Standard YB581-65 "Chemical Analysis Method of Ferrotitanium" will be invalid.
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