GB/T 6609.22-2004 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 6609.22-2004 | English | 95 |
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Chemical analysis methods and determination of physical performance of alumina -- Sampling
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GB/T 6609.22-2004: Chemical analysis methods and determination of physical performance of alumina -- Sampling
---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/GBT6609.22-2004
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.100.10
H 12
Chemical analysis methods and determination of physical
performance of alumina -- Sampling
(ISO 2927.1973, MOD)
Issued on: FEBRUARY 05, 2004
Implemented on: JULY 01, 2004
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword... 3
1 Scope... 4
2 Principle... 4
3 Sampling from belt, tube or plate transport machinery... 4
4 Sampling during unloading using the gravity of containers, tank trucks, and silos... 5
5 Sampling from alumina material piles, cabins, open silos, ton packaging bags, and
tank trucks... 7
6 Preparation and storage of laboratory samples... 8
7 Sampling report... 8
Chemical analysis methods and determination of physical
performance of alumina -- Sampling
1 Scope
This Standard specifies the specific requirements for collecting representative alumina
samples mainly used for aluminum production (for chemical composition analysis and
physical property determination of alumina).
This Standard is applicable to the sampling of alumina during transportation, loading
and unloading, continuous flow, storage, and after storage. For example.
- Sampling when transported by transport machinery (belt, pipe, plate, etc.);
- Sampling when storing or unloading in containers, silos, tank trucks, etc.;
- Sampling when from alumina material piles, cabins, open silos, ton packaging bags,
tank trucks, etc.
2 Principle
Take a constant number of samples in batches using manual or mechanical methods
depending on the situation. Keep the particle size from decreasing during sampling.
Store and transport these samples in sealed containers at room temperature. The sample
should remain in the same physical and chemical state as at the time of sampling until
laboratory testing.
3 Sampling from belt, tube or plate transport machinery
3.1 Devices
3.1.1 Any suitable artificial or mechanical device, such as an Archimedean spiral or
inclined groove.
3.1.2 Sample container. it is advisable to use plastic material.
3.2 Steps
3.2.1 Number of increments in batch samples
Take an increment (at least 2 kg) of the entire width of the chute at intervals equivalent
to one twentieth of the continuous operation time of the transport device.
3.2.2 Laboratory samples
For alumina particles ranging from a few micrometers to 300 μm, 500 g of laboratory
samples can be taken.
Take laboratory samples from the batch samples. According to the steps described in
paragraph 5 and subsequent paragraphs of 3.2.3, use traditional fractionation methods
suitable for dry powder products.
3.2.3 Sampling methods
Firstly, check the sampling device to ensure it is empty. Before actual sampling, turn on
the sampling device at least three times. Discard the remaining samples.
Samples can only be taken from flowing alumina.
Each sample is taken from the entire width of the flow surface.
Sampling is only carried out in continuous flow at maximum capacity and not during
supply interruption or discharge.
If sampling is done mechanically, it should be ensured that there are no other products
in the sample collection container during sampling. During the time interval between
two samplings, prevent any dust from entering the sample collection container.
When transferring samples from the sample collection container to the quarterer or
receiving station, any spillage should be avoided. The sample should be moved using
an Archimedean spiral or inclined groove (3.1.1).
Avoid using feeding hoppers or feeding hoppers. After sampling, it is necessary to avoid
sample accumulation, otherwise it may cause segregation of samples of different
particle sizes.
To minimize the impact of sampling on the atmospheric environment, sampling,
fractionation, and final sample collection should be carried out as quickly as possible
in a moisture-proof room.
4 Sampling during unloading using the gravity of containers, tank
trucks, and silos
4.1 Devices
4.1.1 Any suitable artificial or mechanical device, such as an Archimedean spiral or an
5 Sampling from alumina material piles, cabins, open silos, ton
packaging bags, and tank trucks
5.1 Devices
5.1.1 Archimedean spiral probe made of metal aluminum, metal copper, stainless steel,
or plastic (with an effective filling length of 50 cm).
5.1.2 Archimedean spiral or inclined groove.
5.1.3 Sample container. preferably made of plastic.
5.2 Steps
5.2.1 Number of increments in batch samples
5.2.1.1 Sampling from material piles, cabins, and open silos with a volume exceeding
100 m3.10~15 samples shall be taken from each batch, with each sample weighing no
less than 1 kg.
5.2.1.2 Sampling from ton packaging bags. take 20 increments per 120 tons, each
weighing no less than 1 kg.
5.2.1.3 Sampling from tank trucks. take at least 2 increments from each tank truck, each
weighing no less than 1 kg.
5.2.2 Laboratory samples
500 g (see 3.2.2).
5.2.3 Steps
Use the entire length of the sampling probe (5.1.1) to sample vertically within the entire
top of the material pile as much as possible. In other cases, samples are taken at various
levels of equivalent probe length when unloading materials on material piles or in cargo
holds, open silos, ton packaging bags, and tank trucks.
The number of samples obtained using a sampler in this way is limited by the sampler's
capacity. After the sampler is completely emptied, the capacity of the sampler is
determined through experimental filling.
Sampling is only effective when the sampling probe is uniformly filled and there is no
interruption in between.
If sampling is done mechanically, it should be ensured that there are no other product
residues in the sample collection container during sampling. During the time interval
between two samplings, prevent any dust from entering the sample collection container.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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