YS/T 273.10-2006 English PDF (YST273.10-2006)

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YS/T 273.10-2006: Chemical analysis methods and physical properties of cryolite. Part 10: Determination of alumina content by gravimetric method
YS/T 273.10-2006
YS
NONFERROUS METAL INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 71.100.10
H 21
Chemical analysis methods and physical properties of
cryolite - Part 10: Determination of alumina content by
gravimetric method
ISSUED ON: MAY 25, 2006
IMPLEMENTED ON: DECEMBER 1, 2006
Issued by: National Development and Reform Commission
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Method summary ... 5
3 Reagents ... 5
4 Apparatus ... 5
5 Test sample ... 5
6 Analytical procedure ... 6
7 Calculation of analysis results ... 6
8 Precision ... 7
9 Quality assurance and control ... 7
Foreword
YS/T 273 "Chemical analysis methods and physical properties of cryolite" is divided
into 13 parts:
- Part 1: Determination of wet water content - Gravimetric method;
- Part 2: Determination of ignition loss;
- Part 3: Determination of fluoride content by distillation-thorium nitrate titration;
- Part 4: Determination of aluminum content - EDTA titration method;
- Part 5: Determination of sodium by flame atomic absorption spectrometric method;
- Part 6: Determination of silica content by the molybdenum blue photometric;
- Part 7: Determination of iron content by orthophenantholine photometric method;
- Part 8: Determination of sulfate content - Barium sulfate gravimetric method;
- Part 9: Determination of phosphorus pentoxide content - Molybdenum blue
spectrophotometric method;
- Part 10: Determination of alumina content by gravimetric method;
- Part 11: Determination of sulphur content by X-ray fluorescence spectrometric
method;
- Part 12: The atomic absorption spectrophotometric method for the determination
of calcium oxide content;
- Part 13: Preparation and storage of test samples.
This Part is Part 10.
This Part was proposed by and shall be under the jurisdiction of National Technical
Committee on Nonferrous Metals of Standardization Administration of China.
Fushun Aluminium Factory AND China Nonferrous Metals Industry Standard and
Metrology Quality Institute are responsible for the drafting of this Part.
This Part was drafted by Zhengzhou Institute, Aluminum Corporation of China Limited.
This Part was drafted with the participation of Do-Fluoride Chemicals Co., Ltd.
Main drafters of this Part: Feng Jingdong, Zou Li, Wang Shuhua.
Chemical analysis methods and physical properties of
cryolite - Part 10: Determination of alumina content by
gravimetric method
1 Scope
This Part specifies the method for determination of alumina content in cryolite.
This Part applies to the determination of alumina content in cryolite. Determination
range (mass fraction): ≤5.00%.
2 Method summary
The fluoride salt in the test portion is dissolved in hot aluminum chloride solution; but
the free Al2O3 is not dissolved. After filtering, burn and weigh.
3 Reagents
3.1 Aluminum chloride solution (130 g/L);
3.2 Acetic acid solution (1+19);
3.3 Silver nitrate solution (10 g/L).
4 Apparatus
4.1 Platinum crucible: Top diameter is about 30 mm; bottom diameter is about 20 mm;
height is about 35 mm. It is equipped with platinum lid.
4.2 High-temperature furnace: It can be controlled at 900°C±20°C.
5 Test sample
The test sample shall comply with the requirements of 3.3 in YS/T 273.13.