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Particle size distribution (Granulometry)

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Reference
Endpoint:
particle size distribution (granulometry)
Type of information:
experimental study
Remarks:
Internal data using Laser diffraction
Adequacy of study:
key study
Study period:
Standard Internal measurement
Reliability:
1 (reliable without restriction)
Qualifier:
according to guideline
Guideline:
other: Determination of Particle Size Distribution Using Laser Diffraction
Version / remarks:
Methodology developed according to the expertise of Albemarle Germany
Deviations:
not applicable
Principles of method if other than guideline:
Method 1 - Laser diffraction
- Basic principle:
This method of measurement is based on the interaction between light beams and solid particles. Under the assumption of spherical particles, a laser diffraction pattern can be used to deduce the particle size distribution within a sample.
- Apparatus:
Cilas granulometer
Measuring range: 0.04-2500 μm
- Procedure:
The sample is suspended in a suitable liquid, if necessary, under the addition of a dispersion agent. The suspension is homogenized by stirring and treatment with ultrasound and subsequently pumped through a cuvette. The cuvette is simultaneously radiated by a helium-neon-laser. The light diffraction pattern resulting from the interaction of laser beam and solid particles is detected by a photomultiplier and converted into a particle size distribution by a processor unit.

GLP compliance:
no
Type of method:
Laser scattering/diffraction
Type of particle tested:
primary particle
Specific details on test material used for the study:
Different grades (S, PS, G and F) of Zirconium hydride are produced:
- Grade S: Min 99.9/ < 45 µm by seiving/ Average particle size (APS) according to Blaine: 2.6 +/- 1.6 µm
- Grade PS: Min 99.9/ < 36 µm by seiving/ Average particle size (APS) according to Blaine: 2.0-3.0 µm
- Grade G: Min 99.9/ < 36 µm by seiving/ Average particle size (APS) according to Blaine: 5.5 +/- 1 µm
- Grade F: Min 99.9/ < 45 µm by seiving/ Average particle size (APS) according to Blaine: 2.3 +/-0.5 µm

Granulometry using laser Diffraction are provided for Grade PS, only.
Mass median aerodynamic diameter:
> 2 - < 3 µm
Remarks on result:
other: obtained by performing Blaine's method
Key result
Percentile:
D50
Mean:
ca. 3.412 µm
Remarks on result:
other: ZrH2 grade PS
Percentile:
D90
Mean:
ca. 8.33 µm
Remarks on result:
other: ZrH2 grade PS
Percentile:
other: D100
Mean:
ca. 19.29 µm
Remarks on result:
other: ZrH2 grade PS

Different grades (S, PS, G and F) of Zirconium hydride is produced. Grain size for ZrH2 grades S, G and F is < 45 µm (99.9%) by seiving. Grade PS is < 36 µm (99.9%). Blaine's methods which determines the surface area of powders and deduces the average grain diameter found that grades S, PS and F where between 2.0-3.0 and grade G: 5.5 µm average.

Conclusions:
The granulometry of ZrH2 (grade PS) has been determined using Laser diffraction method (Internal methodology). D50, D90 and D100 were determined according this method and the results were 3.412 µm, 8.33 µm and 19.29 µm respectively.

Description of key information

The granulometry of ZrH2 (grade PS) has been determined using Laser diffraction method (Internal methodology). D50, D90 and D100 were determined according this method and the results were 3.412 µm, 8.33 µm and 19.29 µm respectively.

Additional information