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