|
Because first sample which has been sent in 2011 has been abrasiv, we recommend using grinding disks made of hardmetal tungsten carbide.
With a gap setting of 0,25 mm, all ground particles use to be < 0,25 mm in one dimension. It is possible that some of the particles might be larger or wider as 0,5 mm. For a maximum fineness, a gap setting of 0,1 mm can be set. Output will be lowered then.
During feeding and grinding, a lot of fine sample dust will be formed. To minimize dust exploration, we recommend placing the tube of a vacuum cleaner next to the feeding funnel.
For an optimum feeding, sample pieces should be smaller as 2 cm. Some of the provided particles had shown a maximum length of 35 mm. For this, feeding needs to be supported with a small piece of wood when the feeding funnel will be jammed with sample.
After 2 minutes of grinding, an output of 420 g of sample has been found in the collecting vessel. After 3 minutes of girnding, already 460 g of ground material has been found. A longer grinding time is still possible to achieve a higher output. Usually 8 ± 3 g of sample use to remain loose inside of the grinding chamber.
To determine the fineness of ground particles, we sieved an aliquot with our Vibratory Sieve Shaker ANALYSETTE 3 Pro and a test sieve of 0,5 mm mesh. After 5 minutes of sieving, 6,25 % of particles use to be > 0,5 mm. Already 93,75 % of particles have been ground to < 0,5 mm.
|
