YS/T 575.24-2009 English PDF (YST575.24-2009)

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YS/T 575.24-2009: Methods for chemical analysis of aluminum ores. Part 24: Determination of carbon content and sulfur content. Infrared absorption method
YS/T 575.24-2009
YS
NON-FERROUS METAL INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 77.120.10
H 30
Methods for Chemical Analysis of Aluminum Ores -
Part 24: Determination of Carbon Content and Sulfur
Content - Infrared Absorption Method
ISSUED ON: DECEMBER 4, 2009
IMPLEMENTED ON: JUNE 1, 2010
Issued by: Ministry of Industry and Information Technology of the
People’s Republic of China
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Method Summary ... 5 
3 Reagents and Materials ... 5 
4 Instruments and Equipment ... 6 
5 Sample ... 6 
6 Analytical Procedures ... 6 
7 Analysis Result ... 8 
8 Precision ... 8 
9 Quality Assurance and Control ... 9 
Foreword
YS/T 575 Method for Chemical Analysis of Aluminum Ores is divided into 24 parts:
---Part 1: Determination of Aluminum Oxide Content - EDTA Titrimetric Method;
---Part 2: Determination of Silicon Dioxide Content - Gravimetric-molybdenum
Blue Photometric Method;
---Part 3: Determination of Silicon Dioxide Content - Molybdenum Blue
Photometric Method;
---Part 4: Determination of Iron Oxide Content - Dichromate Titrimetric Method;
---Part 5: Determination of Iron Oxide Content - Orthophenanthroline Photometric
Method;
---Part 6: Determination of Titanium Dioxide Content - Diantipyrylmethane
Photometric Method;
---Part 7: Determination of Calcium Oxide Content Flame Atomic Absorption
Spectrophotometric Method;
---Part 8: Determination of Magnesium Oxide Content - Flame Atomic Absorption
Spectrophotometric Method;
---Part 9: Determination of Potassium Oxide and Sodium Oxide Content - Flame
Atomic Absorption Spectrophotometric Method;
---Part 10: Determination of Manganese Oxide Content - Flame Atomic Absorption
Spectrophotometric Method;
---Part 11: Determination of Chromium Oxide Content - Flame Atomic Absorption
Spectrophotometric Method;
---Part 12: Determination of Vanadium Pentoxide Content - N-Benzoy-N-
Phenylhydroxylamine Photometric Method;
---Part 13: Determination of Zinc Content - Flame Atomic Absorption
Spectrophotometric Method;
---Part 14: Determination of the Total Content of Rare Earth Oxide
Tribromoarsenazo Photometric Method;
---Part 15: Determination of Gallium Oxide Content - Rhodamine B-extraction
Photometric Method;
Methods for Chemical Analysis of Aluminum Ores -
Part 24: Determination of Carbon Content and Sulfur
Content - Infrared Absorption Method
1 Scope
This Part specifies the determination of carbon and sulfur content in aluminum ores.
This Part is applicable to the determination of carbon and sulfur content in aluminum
ores. The range of determination (mass fraction) is: for carbon, 0.02% ~ 10.00%; for
sulfur, 0.020% ~ 12.00%.
2 Method Summary
Place the sample in a high-frequency burner; under oxygen-rich conditions, heat and
burn it through a high-frequency induction furnace. The carbon and sulfur are
respectively oxidized to carbon dioxide and sulfur dioxide. Through excess oxygen,
they are loaded into the measuring cell of their respective infrared gas analyzer.
Carbon dioxide and sulfur dioxide respectively have extremely strong characteristic
absorption bands at 4.262 μm and 7.40 μm. The absorption energy is proportional to
its concentration. In accordance with the changes of energy received by the detector,
detect the carbon and sulfur content. Other gas components do not interfere with the
determination.
3 Reagents and Materials
3.1 Magnesium perchlorate: anhydrous; granular.
3.2 Alkali asbestos: granular.
3.3 Glass wool.
3.4 Tungsten particles: C ≤ 0.0008%, S ≤ 0.0005%; particle size: 0.4 mm ~ 0.8 mm.
3.5 Pure iron: purity is greater than 99.8%; carbon and sulfur contents are smaller than
0.002%; particle size: 0.8 mm ~ 1.68 mm.
3.6 Oxygen: purity is greater than 99.95%.
6.3 Calibration Test
6.3.1 In 3 ~ 5 porcelain crucibles (4.6), respectively weigh-take 0.2000 g ~ 0.4000 g of
corresponding standard samples. Cover 1.8 g of tungsten particles (3.4). Place them
on the crucible holder of a high-frequency burner; let in the oxygen stream and burn it.
Calibrate the low carbon and low sulfur channels of the instrument.
6.3.2 In 3 ~ 5 porcelain crucibles (4.6), respectively weigh-take 0.2 g of pure iron (3.5).
Weigh-take 0.1000 g of benchmark calcium carbonate (3.8); record its mass. Cover
0.2 g of pure iron (3.5) and 1.8 g of tungsten particles (3.4). Place them on the crucible
holder of a high-frequency burner; let in the oxygen stream and burn it. Calibrate the
high carbon channel of the instrument. Or, suitable standard samples with a high
carbon content may also be adopted to calibrate the high carbon channel.
6.3.3 In 3 ~ 5 porcelain crucibles (4.6), respectively weigh-take 0.2 g of pure iron (3.5).
Weigh-take 0.1000 g of potassium sulphate (3.9); record its mass. Cover 0,2 g of pure
iron (3.5) and 1.8 g of tungsten particles (3.4). Place them on the crucible holder of a
high-frequency burner; let in the oxygen stream and burn it. Calibrate the high sulfur
channel of the instrument. Or, suitable standard samples with a high sulfur content may
also be adopted to calibrate the high sulfur channel.
6.4 Times of Determination
Conduct three parallel determinations; take the average value.
6.5 Specimen
Weigh-take 0.1 g ~ 0.2 g of sample, accurate to 0.0001 g; record it as m.
6.6 Blank Test
Weigh-take 0.400 g of pure iron (3.5), place it in a crucible. Cover 1.8 g of tungsten
particles (3.4). Place on the crucible holder of a high-frequency burner; let in the
oxygen stream and burn it. Repeat enough times, till a low and relatively consistent
reading is obtained. Record at least three readings; calculate and record the average
blank value.
6.7 Sample Determination
In accordance with the requirements of the instrument, input the sample No.; place the
porcelain crucible on the balance. Add 0.20 g of pure iron (3.5); weigh-take 0.1000 g
of sample, accurate to 0.0001 g; record its mass. Cover 0.2 g of pure iron (3.5) and 1.8
g of tungsten particles (3.4). Place on the crucible holder; in accordance with the
instrument’s instruction, initiate the analysis function and analyze the samples.