There then follows separation V2 of a first raw sand fraction RS1, using a sifting device SE1, which has {HEAD ~ a size} of {TAIL ~ hole} in the range of, e.g., 10 12 mm 
of
There then follows separation V2 of a first raw sand fraction RS1 , using a sifting device SE1 , which has { HEAD ~ a size } of { TAIL ~ hole } in the range of , e.g. , 10 12 mm
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH