IRON ORE PELLETS

In our application laboratory, we only provide model I of the premium line jaw crusher. We recommend using a model II crusher when higher amounts of sample should be ground.

By this working principle, the smallest gap on the bottom of the grinding chamber will open up ~ 2 mm wide during the grinding process. With a start gap setting of 0,3 mm, usually up to 2 mm thick particles can resign from the grinding chamber. Because the samples only need to comply the gap setting in one dimension, often up to ~ 8 mm long fragments can be found when a sample is ground with standard kinematic. Changed geometry will improve fineness (usually ~ 6 mm long fragments will pass the grinding chamber), but throughput will be reduced immensely (usually only a few kilograms per hour).

With the present sample, a change of kinematic is not purposeful. To check the output speed with 0,3 mm gap (smallest gap setting) and standard geometry, we fed the iron ore pellets manually with a constant feed rate for about two minutes.

We have been able to comminute 4,5 kg of sample with this frame of time (so up to 2,25 kg per minute is plausible to feed). The grinding sound of the iron ore pellets was very smooth, so a comminution of higher sample amounts is possible this way.

To check the level of fineness, we used a test sieve of 3,15 mm and sieved 600 grams of sample output. We found ~ 86 % < 3 mm result with this single step grinding.

The grinding chamber is not significantly polluted, no fragments are attached to the jaws, only fine sample dust is lying on top of the equipment. Cleaning was performed rapidly by vacuuming with a soft brush. It is possible to improve fineness, e.g. when the ground sample will be guided into a Disk Mill PULVERISETTE 13 which can be mounted directly below the jaw crusher (see result 2).

The ground sample of result 01 was ~ 86 % < 3 mm (determined by sieving). To improve the fineness and only feeding the sample one time with a proper speed, we recommend combining a Jaw Crusher PULVERISETTE 1 with a Disk Mill PULVERISETTE 13. A special rack is allowing skipping usage of the collecting vessel and sliding the output of a jaw crusher directly into the Disk Mill feeding funnel.

We constantly fed pre-crushed sample of result 01 into the feeding funnel of our premium line Disk Mill PULVERISETTE 13. The disk mill was equipped with 0,4 mm gap setting. The grinding sound was very smooth during the grinding process.

We interrupted feeding and grinding of the sample after 90 seconds. At this moment, already 1,2 kilograms of sample was found inside the collecting vessel. By this, theoretically an output up to 48 kilogram of sample might be grindable per hour.

The grinding chamber is covered with fine sample dust. Majority of residue is lying loose on top of the fixed grinding disk and can be brushed into the ground sample as well.

Majority of dust was removed by vacuuming with a soft brush. Also, fineness of this sample was checked by manual sieving. The sample output passed the used test sieve completely. We recommend using a larger gap setting to improve output speed and still remain below 95 % < 3,00 mm demand.