METHOD OF ORE-PICKING Russian patent published in 2012 - IPC B03B9/00 B03B13/00 

FIELD: process engineering.

SUBSTANCE: invention relates to mining and may be used for ore qualification at mining stage. Proposed method comprises ore excavation, or crushing stage-by-stage in crushers, classifying crushed ore, separating off-grade and gob ore using lump X-ray spectral separation with re-crushing of ore portion. In sampling lumps of every size grade with discrete distribution of mineral over lump surface, luminescence signal pulse length is defined whereat lumps of given size grade have mineral content approximating to cutoff grade. In separation, all lumps with uniform distribution of mineral and those with its discrete distribution that feature luminescence signal pulse length exceeding reference value are extracted into dressed product. Lumps exhibiting pulse length smaller than reference value for current grade size nut exceeding that for the next grade size are subjected to re-crushing and further separation.

EFFECT: higher efficiency of dressing and yield.

1 dwg, 3 tbl