B - Operations – Transporting – 02 – C
Patent
B - Operations, Transporting
02
C
241/59
B02C 17/02 (2006.01) B02C 17/18 (2006.01) B02C 21/00 (2006.01)
Patent
CA 1316890
ABSTRACT In autogenous grinding of mineral material in a grinding mill with a screening wall a method is provided for enabling the removal of at least three different fractions without the need of the screening wall being divided into sectors, thus increasing grinding material turnover and grinding capacity, namely by passing through openings (8) distributed over the screening wall (7) a mixed material fraction containing all material fractions having a particle size greater than or equal to the greatest openings (8) in the screening wall and dividing up the mixed material fraction into at least three fractions in a classifying appara- tus (13), by always taking out from the classifying apparatus (13) at least a fine fraction, a coarse fraction and a medium coarse fraction, the latter two fractions being kept separate for permitting, as required, diversion (38) of the coarse material fraction as grinding charge to following grinding steps, the two fractions being put together when said need of charge material is not present, when they may be taken to a means for reduction to sub-critical sizes for subsequent return to the mill (1) for renewed grinding.
595656
Marklund Olle
Sodermark Gunnar
Mcfadden Fincham
Olmar Ab
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