GB/T 21524-2008 English PDF (GBT21524-2008)

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GB/T 21524-2008: Particle size determination of inorganic chemical products -- Sieving method
GB/T 21524-2008
Particle size determination of inorganic chemical products. Sieving method
ICS 71.060.10
G10
National Standards of People's Republic of China
Inorganic chemical products for particle size
Determination of sieving
(ISO 2926. 1974, NEQ)
Posted 2008-04-01
2008-09-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This standard and ISO 2926. "Analysis of the particle size sieving process alumina is mainly used for the production of aluminum," agreed (in English) International Standard 1974
The degree of non-equivalent.
This standard and the international standard ISO 2926. 1974 main technical differences are.
--- Use is not limited to "is used for the production of aluminum";
--- Particle size amended as follows. greater than 45μm;
--- Increase hand sieve method, brush method and wet sieving.
The standard proposed by China Petroleum and Chemical Industry Association.
This standard by the National Standardization Technical Committee chemical inorganic chemicals Club (SAC/TC63/SC1) centralized.
This standard is drafted by. CIQ Tianjin, Tianjin Chemical Engineering Research and Design Institute.
The main drafters of this standard. From Liu Shao, Li Guangming, Lu Gang.
This standard is the first release.
Inorganic chemical products for particle size
Determination of sieving
1 Scope
This standard specifies the method for determination of particle size of inorganic chemical products.
This standard applies to a particle size greater than 45μm, the determination does not absorb moisture or water-insoluble inorganic chemical products granularity.
2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research
Study whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.
GB/T 6003.1-1997 woven wire mesh test sieve (eqv ISO 3310.1.1990)
3 Terms and Definitions
The following terms and definitions apply to this standard.
3.1
Reciprocating test sieve shaking hands, one hand at a distance amplitude gently crash test sieves, resulting vibration causes particles smaller than the pore size by
The method of screening mesh.
3.2
The test sieves mounted on a vibrating sieve machine, sieving through sieve shaker test carried out.
3.3
Wool brush lightly repeated sample test sieve, so that particles smaller than the aperture through the sieve screening method (which applies to bulk density is
Small sample).
3.4
With a flow rate of rinse water samples, or edge trimming brush lightly, or to test sieve containing the sample immersed in water with a brush lightly, and into
Line screening method (This method is suitable for smaller bulk density and insoluble in water samples).
4 principle of the method
The advance on (105 ± 2) ℃ dried and cooled to room temperature inorganic chemical product samples, the relative humidity less than 50% of the environment
After sieving reach the end of the screening, the use of hand sieving, mechanical methods, brush or wet sieving, weighing different quality sieve the remaining samples, count
In calculating the limit of sieve sample particle size distribution.
5 Instruments
5.1 Test sieve. the sieve of woven wire mesh, mesh sizes and technical specifications should be consistent with GB/T 6003.1-1997 of R40/3 series
Claim.