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Physical & Chemical properties

Particle size distribution (Granulometry)

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Reference
Endpoint:
particle size distribution (granulometry)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
From 23 October 2013 (date of the measurements) to 3 December 2013 (date of the study report)
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Reason / purpose:
reference to same study
Qualifier:
no guideline followed
Principles of method if other than guideline:
Laser diffraction particle size analysis was applied on a dispersion of the powder in isopropanol. Six measurements were performed according to GRAN-99001 (internal method).
GLP compliance:
no
Other quality assurance:
other: The activity of R&I Centre Brussels is certified according to the ISO 9001:2000 standard.
Type of method:
Laser scattering/diffraction
Type of particle tested:
primary particle
Type of distribution:
volumetric distribution
Mass median aerodynamic diameter:
23.81 µm
Geometric standard deviation:
0.14
Key result
Percentile:
D10
Mean:
4.017 µm
St. dev.:
0.016
Key result
Percentile:
D50
Mean:
14.66 µm
St. dev.:
0.09
Key result
Percentile:
D90
Mean:
37.7 µm
St. dev.:
0.4

The table below summarizes the individual results, the mean value and the standard deviation for the mean diameter, D50 (median), the D10 and D90 percentiles and the MMAD estimated by assuming that the particles are spherical.

 

Mean diameter

(μm)

D50

(μm)

D10

(μm)

D90

(μm)

MMAD

(μm)

Trial 1

19.06

14.77

4.037

38.20

23.98

Trial 2

18.91

14.68

4.019

37.88

23.84

Trial 3

18.75

14.55

3.995

37.55

23.63

Trial 4

19.01

14.75

4.032

38.02

23.95

Trial 5

18.70

14.63

4.010

37.47

23.76

Trial 6

18.65

14.58

4.009

37.27

23.68

Mean value

18.85

14.66

4.017

37.7

23.81

Standard deviation

0.17

0.09

0.016

0.4

0.14

Conclusions:
The mean D50 of Lithium cryolite was found to be 14.66 µm.
Executive summary:

Laser diffraction particle size analysis was applied on a dispersion of the powder in isopropanol. Six measurements were performed. The particle size distribution is summarised as follows:

 

Mean diameter

(μm)

D50

(μm)

D10

(μm)

D90

(μm)

MMAD

(μm)

Mean value

18.85

14.66

4.017

37.7

23.81

Standard deviation

0.17

0.09

0.016

0.4

0.14

Description of key information

D50 (median): 14.66 µm
D10 : 4.017 µm
D90 : 37.7 µm

Additional information

One reliable key study is available for this endpoint.

Laser diffraction particle size analysis was applied on a dispersion of the powder in isopropanol. Six measurements were performed. The particle size distribution is summarised as follows:

 

Mean diameter

(μm)

D50

(μm)

D10

(μm)

D90

(μm)

MMAD

(μm)

Mean value

18.85

14.66

4.017

37.7

23.81

Standard deviation

0.17

0.09

0.016

0.4

0.14