GB/T 6609.2-2022 PDF English
US$200.00 · In stock · Download in 9 secondsGB/T 6609.2-2022: Chemical analysis methods and determination of physical performance of alumina - Part 2: Determination of loss of mass at 300 and 1 000 degree-Celsius Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB/T 6609.2: Evolution and historical versions
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| GB/T 6609.2-2022 | English | 200 |
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Chemical analysis methods and determination of physical performance of alumina - Part 2: Determination of loss of mass at 300 and 1 000 degree-Celsius
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| GB/T 6609.2-2009 | English | 479 |
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Chemical analysis methods and determination of physical performance of aluminium hydroxide -- Part 2: Determination of loss of mass at 300 Celsius and 1000 Celsius
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| GB/T 6609.2-2004 | English | 199 |
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Chemical analysis methods and Determination of physical performance of alumina Determination of the loss of mass at 1100 Degree Celcius -- Gravimetric method
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| GB/T 6609.2-1986 | English | 199 |
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Methods for chemical analysis of aluminium oxide--The gravimetric method for the determination of loss content on ignition
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GB/T 6609.2-2022: Chemical analysis methods and determination of physical performance of alumina - Part 2: Determination of loss of mass at 300 and 1 000 degree-Celsius
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT6609.2-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.100.10
CCS H 12
Replacing GB/T 6609.2-2009
Chemical analysis methods and determination of physical
performance of alumina -- Part 2.Determination of loss of
mass at 300 °C and 1000 °C
Issued on: MARCH 09, 2022
Implemented on: OCTOBER 01, 2022
Issued by. State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword... 3
Introduction... 7
1 Scope... 9
2 Normative references... 9
3 Terms and definitions... 9
4 Instruments and equipment... 10
5 Determination of moisture content (MOI)... 10
6 Loss of ignition (LOI) measurement... 11
7 Instrument analysis... 14
8 Precision... 15
9 Test report... 16
Annex A (informative) Schematic diagram of a typical drying device... 18
Annex B (normative) Preparation procedure of air balance specimen... 20
Chemical analysis methods and determination of physical
performance of alumina -- Part 2.Determination of loss of
mass at 300 °C and 1000 °C
WARNING -- The personnel using this document shall have practical experience
working in a formal laboratory. This document does not indicate all possible
security issues. Users are responsible for taking appropriate safety and health
measures and ensuring compliance with relevant national regulations.
1 Scope
This document specifies the method for determining the mass loss of alumina at 300 °C
and 1000 °C. The mass loss of the original specimen after drying at 300 °C is
represented by the moisture content (MOI). Use loss on ignition (LOI) to represent the
mass loss of a pre-dried specimen at 300 °C when burned at 1000 °C.
This document is applicable to the determination of mass loss in alumina. The mass
loss measurement range is at 300 °C. 0.20%~5.00%; The mass loss measurement range
is at 1000 °C is 0.10%~2.00%. Instrumental analysis is not used as an arbitration test
method.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 6609.23, Chemical analysis methods and determination of physical
performance of alumina -- Preparation and storage of test samples
GB/T 8170, Rules of rounding off for numerical values and expression and
judgement of limiting values
3 Terms and definitions
There are no terms or definitions that need to be defined in this document.
4 Instruments and equipment
4.1 Drying machine. including an alumina heating frame that can hold 4 platinum
crucibles and a drying agent, using activated alumina (activated alumina shall be heated
and activated at 300 °C±5 °C before use) or phosphorus pentoxide as the drying agent.
The dryer shall be equipped with a metal heat-resistant frame with a diameter of about
150 mm and a depth of about 30 mm. A dehumidification trap shall be installed at the
inlet of the dryer cover. The dehumidification trap shall be equipped with granular
desiccant. A typical schematic diagram of a drying device can be found in Annex A.
4.2 Platinum crucible (with platinum lid). the diameter is about 35 mm and the depth is
about 40 mm.
4.3 Oven. the temperature can be controlled at 300 °C±5 °C; ensure air flow inside the
oven.
4.4 High temperature furnace. the temperature can be controlled at 1000 °C±10 °C.
4.5 Analytical balance. sensitivity is 0.0001 g.
4.6 Thermogravimetric analyzer. at least including heating system, weighing system,
control system and other parts. The furnace temperature of the instrument can be
controlled at 300 °C±5 °C and 1000 °C±10 °C. The sensitivity of the built-in balance
in the weighing system is 0.0001 g. Its accuracy shall meet the special accuracy level
calibration requirements of electronic balances.
4.7 Weighing bottle (including lid). the size is sufficient to hold the required amount of
specimen.
4.8 Plate. flat bottomed, with a bottom area of not less than 100 cm2.
5 Determination of moisture content (MOI)
5.1 Principle
Dry the original specimen at a temperature of 300 °C±5 °C for 2 h. Calculate the
moisture content of the original specimen based on the difference in mass before and
after.
5.2 Specimens
The specimen shall comply with the original specimen preparation and storage
requirements in GB/T 6609.23.
5.3 Test steps
6.1 Principle
Burn the pre-dried specimen at 300 °C±5 °C for 2 h at a temperature of 1000 °C±10 °C.
Calculate the burn loss based on the difference in mass before and after.
6.1.2 Specimens
The specimen is a pre-dried specimen at 300 °C, obtained by drying the original
alumina specimen (5.2) at a temperature of 300 °C±5 °C for 2 h.
6.1.3 Test steps
6.1.3.1 Parallel test
Conduct two parallel tests. Take the average value.
6.1.3.2 Preparation of platinum crucible
Heat and burn the platinum crucible (4.2) in a high-temperature furnace (4.4) at
1000 °C±10 °C for 15 min. Take it out and cool it slightly. Put it into the dryer (4.1).
Cool for 10 min. Quickly take out and weigh to the nearest 0.0001 g. Record the mass
of the platinum crucible (m3).
6.1.3.3 Burn reduction measurement at 1000 °C
Add 5 g±0.5 g of specimen (6.1.2) to the processed platinum crucible (see 6.1.3.2).
Record the specimen mass (m4) to the nearest 0.0001 g. Immediately cover the lid
(weighing operation shall be completed within 20 s). Immediately place the platinum
crucible in the high-temperature furnace (4.4). Tilt the lid to expose obvious gaps or
remove the lid and place it in a high-temperature furnace to raise the temperature to
1000 °C±10 °C. Maintain at this temperature for 2 h. Remove the platinum crucible.
Quickly place it in the dryer (4.1). Cover the lid. After cooling to room temperature (the
cooling time shall not exceed 30 min), slowly release the vacuum in the dryer through
a moisture trap without interfering with the measurement. Immediately weigh the total
mass of the platinum crucible and specimen after burning, accurate to 0.0001 g. Record
its mass (m5).
6.1.4 Test data processing
The content of burn off is calculated based on the burn off mass fraction (wLOI) using
formula (2).
Where,
m3 - the mass of the processed platinum crucible, in grams (g);
m4 - the mass of pre-dried specimen at 300 °C, in grams (g);
m5 - the total mass of the platinum crucible and specimen after being burned at 1000 °C,
in grams (g).
The calculation result is expressed to two decimal places. Numerical rounding shall be
carried out in accordance with the provisions of GB/T 8170.
6.2 Air balance water calibration method
6.2.1 Principle
Weigh two specimens that have been equilibrated with air. Dry an air equilibrium
specimen at a temperature of 300 °C±5 °C for 2 h to determine the air equilibrium
moisture. At the same time, another air balance specimen was burned at a temperature
of 1000 °C±10 °C for 2 h to determine the burning amount. Calculate burn loss using
air balance moisture data and calibration formula.
6.2.2 Specimens
Place the original alumina specimen (5.2) in a plate (4.8), spread it evenly, and
equilibrate it in the air in the laboratory for no less than 2 h (follow the instructions in
Annex B). When using the air balance water calibration method to determine burn loss,
the same batch of air balance specimens shall be used for measuring moisture at 300 °C
and burning at 1000 °C.
6.2.3 Test steps
6.2.3.1 Parallel test
Conduct two parallel tests. Take the average value.
6.2.3.2 Determination of moisture content at 300 °C in air balance specimens
Operate according to section 5.3.2.Preprocess weighing vessels (4.2 or 4.7) at a
temperature of 300 °C. Add 5 g ±0.5 g of specimen (6.2.2) to the preprocessed weighing
vessel. According to the operation in section 5.3.3 and formula (1) in 5.4, calculate the
moisture mass fraction (w air balance) of the air equilibrium specimen after drying at
300 °C.
6.2.3.3 Preparation of platinum crucible
Place the platinum crucible (4.2) into a 1000 °C±10 °C high-temperature furnace (4.4)
and burn for 15 min. Take it out and let it cool slightly. Place in the dryer (4.1), cool for
10 min, and quickly weigh to the nearest 0.0001 g. Record the mass of the platinum
crucible (m6).
7.2 Specimens
The specimen shall comply with the original specimen preparation and storage
requirements in GB/T 6609.23.
7.3 Test steps
7.3.1 Parallel test
Conduct two parallel tests and take the average value.
7.3.2 Establish a moisture and burn loss analysis program
Turn on the instrument. Establish a moisture and burn loss analysis program according
to the instrument instructions. Enter the name of the analysis program, the range of
specimen weighing mass, and other information, set parameters such as temperature,
heating rate, end conditions, and holding time, and edit the formula for calculating
moisture and burn loss results. Save the analysis program. The time for the instrument
to reach a room temperature of 300 °C shall not exceed 25 min. The time from 300 °C
to 1000 °C shall not exceed 40 min.
7.3.3 Determination
7.3.3.1 Special crucible for testing with constant weight burning.
7.3.3.2 Select the required analysis program. Place a crucible of constant weight inside
the instrument (see 7.3.3.1). Automatically weigh the empty crucible and record its
mass. Take 3 g~6 g of alumina specimen (7.2) and place it in a crucible. The instrument
automatically weighs and records the sample mass. Edit and set sample information to
begin analysis and measurement.
7.3.3.3 The instrument heats up to 300 °C at the set rate, keeps warm and dries, and
automatically weighs the crucible and specimen mass after drying. Calculate the
moisture content of the specimen. For the specimen dried at 300 °C, heat it up to
1000 °C at the set rate, keep it warm and burn it, and automatically weigh the crucible
and specimen mass after burning. Calculate the burn off of the specimen. The
calculation result is expressed to two decimal places. Numerical rounding shall be
carried out in accordance with the provisions of GB/T 8170.
8 Precision
8.1 Repeatability
The measured values of two independent test results obtained under repeatability
conditions, within the range of the average values given below, shall not exceed the
repeatability limit (r) given in Table 1, and the absolute difference between these two
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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