The main components are:
The crushed and foreign material free sand ist filled via a buffer into the grinding chamber.
The drive shaft, fitted with agitation kits, accelerates the sand and starts the grinding process.
There are three types of friction:
The duration of the sand treatment depends on the sand impurity level and can be set to the respective requirements and operational conditions. The cleaning intensity is variable and cleaning
takes place gently without destroying the sand.
The abraded binder residues are sucked out during the cleaning process.
H33, new sand
After Pre attrition in feed tank
After final treatment in the Reibregenerator
Granulometric analyses versus reclaiming cycles (dry screening)
For the used sand H33, the actual value of the average grain size from the suppliers product data is shown (0,27 mm), and the value measured at the mixer outlet (0,29 mm) during moulding.
Overall, only negligible fluctuations in the average grain size in the reclaimed sand were noted in the peroid from the end of 2010 until today. The average grain size always was about 0,29 mm.
In the feed vessel, prior to final reclamation, the average grain size was about 0,01 to 0,04 mm higher than after the final grinding process.
The total loss during reclamation is since 2010 always at about 7,0 %.
Compressive strength of various sand mixtures and different reclamation levels
Adjacent figure of the compressive strength shows the bench life of the sand mixture.
From past experience we know that there should be a maximum pressure strength of about 1,0 N/cm² without sustainable harming the binder bridges by manipulations or moulding material
Important for the evaluation of the reclaimed sand for moulding are electrical conductivity (recommended < 800 µS, see literature) and the soda content (max. 0,15 %, see literature).
Both, the samples of the electrical conductivity of less than 500 µS and the sodium content to 0,15 %, showing values among the recommended data.
Mould, which was made with 100 % reclaimed sand and was completed in the upper region with 100 % new sand.
Detail of a foundry mould of a large AL-casting, manufactured with 80 % reclaimed sand.
(Pat. EP2666562 / PCT/EP/2013/003548)
MRR 1-40, mobile version
1.600 * 1.600 * 2.950 mm high
1.600 * 1.600 * 2.450 mm high
RR 2-85 with an output of approx. 1.200 kg/h
RR 2-120 with an output of approx. 2.000 kg/h
Further models on request.