Cokes & SiO2

The majority of particles already use to be < 2 mm as requested. Only a few particles have a length above 4 mm (< 5 mm; 20 mm particles as filled into the questionnaire have not been found). For this, the desired amount of sample can be ground rapidly with our Mortar Grinder PULVERISETTE 2.

After only 2 minutes of grinding, the complete sample has been used with a test sieve of 1,4 mm mesh from our Vibratory Sieve Shaker ANALYSETTE 3 Pro to determine the fineness. All particles use to be << 1,4 mm. The desired fineness of < 2 mm has been achieved.

Even better grinding results are plausible by longer dry grinding with Mortar Grinder PULVERISETTE 2.

Just 30 seconds of grinding has been fulfilling to achieve 100 % < 1,4 mm (determined by manual sieving with a test sieve of that size).

Sample is not sticking so far, so longer grinding times are still possible to maintain achieve a better dry grinding result.

By standard, rotors are not available with tungsten carbide coating (as requested), only sieve rings with 0,25 mm trapezoidal perforation are available with hardmetal tungsten carbide coating. So rotor, sieve ring (probably pan and lid) have to be ordered as special designed items.

Abrasive samples like the present which contains silicone oxide will have a sanding effect to coated sieve rings or rotors. We are guessing that even a coating with hardmetal tungsten carbide will be removed rapidly.

Complete sample can be ground within 20 seconds, all particles are able to pass the used 1,4 mm test sieve too.

We determined a weight loss of 0,05 g on the impact rotor and 0,02 g on the used standard sieve ring.

For this, we recommend to prefer a grinding with Mortar Grinder PULVERISETTE 2 or Planetary Mono Mill PULVERISETTE 6 classic line.