Comparison of Sieve analyses, laser diffraction, image analyses and FBRM for the determination of particle size distributions part 4
Wednesday, January 11th, 2012 3:41:12 by Ahmed Tariq
Comparison of Sieve analyses, laser diffraction, image analyses and FBRM for the determination of particle size distributions part 4
Focused Beam Reflectance Measurement (FBRM).
A Lasentec (FBRM) was used to measure the chord length distribution (CLD) of samples using a Lasentec D600L FBRM probe. In all the experiments, the measurements were carried out in suspensions which were prepared in Silicon Oil.
Sample suspension were put into a 500 cm3 beaker and agitated using a pitched blade impeller at a speed of 400 rpm so that the sample is well dispersed in the solution. The measured chord count data were classified into 90 logarithmically spaced
channels over the particle size range of 1-1000 µm. The data analysis software gives the CLDs in different formats.
It has been reported that the conversion of measured CLD to its corresponding PSD is not straightforward (Kempkes et al., 2007; Wynn, 2003), therefore the most suitable statistics of the measured CLD were directly compared with the PSDs measured by other
techniques.
Results and Discussion
Two different particle samples, spherical Glass Beads and non-spherical Sodium Chloride were used in the experiments. Shape factor is an effective mean for the quantification of particle shape.
Sphericity (S), a common shape factor, was calculated (for each particle) from image processing and analyzed to consider the deviation of the shape of samples from ideal sphere. The means of sphericity are shown below for the Glass Beads (GB) and Sodium
chloride (NaCl), measured by IA.
The SA does not measure the particle size of an individual particle and it is highly influenced by the particle form. During sieving, the particles in sieves rotate in all directions and hence the particle can pass through the sieves diagonally (along the
least cross-sectional area of the particle).
In contrast, the LD measures the particle size of an individual particle and hence LD results are shifted towards the larger particle size for non-spherical particles.
Tags: Comparison, FBRM, image analyses, laser diffraction, October 2012, Science, Sieve analyses, Swiss authorities, technology, The Italian JobShort URL: https://www.newspakistan.pk/?p=8856
Posted by Ahmed Tariq
on Jan 11 2012. Filed under Sci-Tech.
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