SORTING LIMESTONE ELECTRONICALLY

THE SORTEX OPTICAL SEPARATOR IS SUCCESSFULLY AND ECONOMICALLY PROCESSING LIMESTONE IN NORTH WALES. A VIBRATORY FEEDER MOVES SIZED, RUN-OF-MINE STONE ONTO A ROTARY ALIGNING TABLE. WHILE ON THE FEEDER THE STONE IS SPRAYED TO REMOVE DUST AND INTENSIFY ITS NATURAL COLOR. THE ALIGNING TABLE IS A REVOLVING DISC WHICH DELIVERS ROCKS ONE AT A TIME ONTO THE MAIN CONVEYOR. GUIDING BELTS STOP THE ROTATION OF THE STONE RELATIVE TO THE DISC AND STEER THEM TOWARDS THE EXIT CHANNEL. THE MAIN CONVEYOR TAKES THE STONE TO THE OPTICAL CHAMBER THROUGH WHICH THE STONES FALL ALONG A PREDETERMINED TRAJECTORY. WHILE FREE-FALLING, THE STONES ARE VIEWED FROM TWO SIDES BY INSPECTING CAMERAS WHICH SUPPLY DATA TO THE CONTROL UNIT ON THE SIZE AND DISCOLORATION OF EACH PIECE. THE IMAGE OF THE STONE IS FOCUSED ONTO THE PLANE OF THE DISC FROM WHERE IT PASSES THROUGH A CONDENSING LENSE TO REFOCUS THE IMAGE ON THE LIGHT SENSITIVE AREA OF THE PHOTOMULTIPLIER. WHEN THE EJECTION SYSTEM FIRES, THE APPROPRIATE STONE PIECE IS HIT BY THE AIR BLAST FROM COMPRESSED AIR NOZZLES AND DEFLECTED FROM ITS FREEFALLING PARABOLA. ADDITIONAL FACILITIES INCLUDE AUTOMATIC FEED RATE; CONTROL; CONTINUOUS RECORDING OF FEED RATE AND EJECTION RATE; FULLY INTERLOCKED SEQUENTIAL STARTING; WARNING DEVICES AND AUTOMATIC EMERGENCY CUT-OUTS.

  • Supplemental Notes:
    • Vol73, No 3, PP 76-79, 7 FIG, 2 TAB
  • Publication Date: 1970-3

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Filing Info

  • Accession Number: 00217806
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 1 1970 12:00AM