Reaction product of fusion between 1000°C and 2000°C of aluminium oxide and calcium oxide based raw materials with at least CaO+Al2O3+Fe2O3 > 85%, in which aluminium oxide and calcium oxide in varying amounts are combined in various proportions into a multiphase crystalline matrix.

Particle size distribution (Granulometry)

Administrative data

Endpoint:

particle size distribution (granulometry)

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2010

Report date:

2010

Materials and methods

Test guideline

Qualifier:

no guideline followed

Principles of method if other than guideline:

kerneos reference methods: INS L017 CL : Sieving quartering
kerneos reference methods: INS L012 CL : Laser grading - dry process

GLP compliance:

not specified

Type of distribution:

other: particle size distribution

Test material

Test material information

Constituent 1

Reference substance name:

Reaction product of fusion between 1000°C and 2000°C of aluminium oxide and calcium oxide based raw materials with at least Ca0+Al2O3+ Fe2O3 > 85%, in which aluminium oxide and calcium oxide in varying amounts are combined in various proportions into a multiphase crystalline matrix.

IUPAC Name:

Reaction product of fusion between 1000°C and 2000°C of aluminium oxide and calcium oxide based raw materials with at least Ca0+Al2O3+ Fe2O3 > 85%, in which aluminium oxide and calcium oxide in varying amounts are combined in various proportions into a multiphase crystalline matrix.

Details on test material:

- Name of test material (as cited in study report):ALAG® (0-1 mm)
- Substance type: mineral
- Physical state: powder

Results and discussion

Particle size

Particle size 1

Percentile:

D50

Mean:

> 100 µm

Remarks on result:

other: The mean diameter of 50 % of particles by weight (sieving methods) lies in between 315 and 500 µm. Therefore the MMAD is above 100 µm.(migrated from fields under 'Mass median diameter' as D50 percentile. No source field for Standard deviation.)

Particle size 2

Percentile:

D10

Mean:

15.2 µm

Remarks on result:

other: These mean diameters have been worked out from a population of particles already below 100 µm, under 1 bar

Particle size 3

Percentile:

D50

Mean:

62.6 µm

Remarks on result:

other: These mean diameters have been worked out from a population of particles already below 100 µm, under 1 bar

Particle size 4

Percentile:

D90

Mean:

134

Remarks on result:

other: These mean diameters have been worked out from a population of particles already below 100 µm, under 1 bar

Particle size distribution at different passages

Particle size distribution at different passages 1

No.:

#1

Size:

2.5 mm

Distribution:

0 %

Remarks on result:

other: cumulative reject

Particle size distribution at different passages 2

No.:

#2

Size:

1 mm

Distribution:

0.071 %

Remarks on result:

other: cumulative reject

Particle size distribution at different passages 3

No.:

#3

Size:

0.8 mm

Distribution:

8.53 %

Remarks on result:

other: cumulative reject

Particle size distribution at different passages 4

No.:

#4

Size:

0.5 mm

Distribution:

41.93 %

Remarks on result:

other: cumulative reject

Particle size distribution at different passages 5

No.:

#5

Size:

0.315 mm

Distribution:

61.7 %

Remarks on result:

other: cumulative reject

Particle size distribution at different passages 6

No.:

#6

Size:

0.25 mm

Distribution:

70.53 %

Remarks on result:

other: cumulative reject

Particle size distribution at different passages 7

No.:

#7

Size:

0.2 mm

Distribution:

74.27 %

Remarks on result:

other: cumulative reject

Particle size distribution at different passages 8

No.:

#8

Size:

0.1 mm

Distribution:

86.17 %

Remarks on result:

other: cumulative reject

Particle size distribution at different passages 9

No.:

#9

Size:

< 100 µm

Distribution:

10.6

Remarks on result:

other: cumulative reject

Any other information on results incl. tables

In order to be more accurate with the distribution, measures have been carried out under 4 different pressures of the ejector:

INF to 100µm	D10	D20	D25	D50	D75	D80	D90
under 1 bar	15.2	29.9	35.8	62.6	96.9	106.7	134
under 2 bars	12.3	26.1	31.9	57.9	90.8	100.1	126.1
under 3 bars	10.8	23.8	29.5	54.9	86.8	95.8	120.9
under 4 bars	10	22.7	28.4	53.6	85.2	94.2	119.4

This table indicates the diameter lower than the % indicated. For example, 10% of the particles lower than 100 µm have a diameter of 15.2 µm under an ejector pressure of 1 relative bar, and 12.3 µm under a pressure of 2bar

According to the attached graph, it can be seen that 0.62% of the particles under 100 µm have a diameter lower than 4 µm.

The sieving measures show that the medium diameter at 50% in weight is between 315 and 500 µm, probably above 400µm, so the Mass Median Aerodynamic Diameter (MMAD) is assuredly above 100 µm.

Applicant's summary and conclusion

Conclusions:

The mass median aerodynamic diameter (MMAD) is above 100 µm and that 0.62% of the particles under 100 µm have a diameter lower than 4 µm under 1 bar

Executive summary:

The sieving method applied to Alag® has shown that the percentage cumulative reject for a 0.1 mm mesh size was 86.17 % . However the laser method used for the same particles showed that the particles geometric shape is not spheric and it explains why a 100 µm sieve allows them to pass through why the particles may have a lenght longer than 100 µm. The laser measures show that, among the particles below 100 µm, 10 % of particles have a diameter below 15.2 µm, 50 % a diameter below 62.6 µm and 90% a diameter below 134.0 µm. Further measures and extrapolations give the following results: the mass median aerodynamic diameter is above 100 µm and that the 0.62% of the particles under 100 µm have a diameter lower than 4 µm under 1 bar