INFLUENCE OF CRACKING ON THE APTITUDE OF MINERALS TO CRUSHING - RS 392

INFLUENCE DE LA FISSURATION DES MINERAIS SUR LEUR APTITUDE AU BROYAGE - RS 392

THE AIM OF THE RESEARCH DESCRIBED IS TO EXPLAIN AND FORESEE CRUSHING BEHAVIOUR FROM THE EVOLUTION IN CRACKING. THE FIRST PART OF THE RESEARCH CONSISTED OF A METHODOLOGICAL STUDY OF 3 TECHNIQUES TO USE IN THE RESEARCH: (1) CRUSHING ON A QUASI-COMMERCIAL CRUSHER; (2) MANUFACTURE OF POLISHED SECTIONS WITHOUT MODIFYING THE CRACKING OF PARTICLES; (3) MEASUREMENTS WITH AN IMAGE ANALYZER. INVESTIGATIONS WERE CARRIED OUT ON MINERALS FROM LARGENTIERE AND SALSIGNE, WHICH ARE AT OPPOSITE POLES FROM THE POINT OF VIEW OF CRACKING. SPECIFIC MEASUREMENT TECHNIQUES WERE UTILIZED WHICH ENABLED TWO DIFFERENT METHODS OF DETECTION TO BE DEVELOPED. IT WAS OBSERVED THAT CRUSHING CAUSES CRACKING. THIS PHENOMENON DOES NOT NECESSARILY OCCUR INSIDE THE MATERIALS. FOR VERY SIMILAR GRANULARITY IT IS POSSIBLE TO OBTAIN WITH THE SAME MATERIAL AND THE SAME CRUSHER BUT WITH VARIOUS CRUSHING TIMES, CRACKED OR PRACTICALLY UNCRACKED PARTICLES. A DISTINCTION MUST BE MADE BETWEEN "CRACK RELEASE" AND "MINERAL RELEASE". IDEALLY THESE TWO TYPES OF RELEASE SHOULD HAPPEN TOGETHER, BUT, IN PRACTICE, STUDIES SHOW THAT THIS DOES NOT HAPPEN SINCE CRACKS OCCUR WITHIN THE MINERAL AS WELL AS AT THE INTERFACES. THIS IS WHERE THE PROBLEM OF THE DEGREE OF "MINERAL RELEASE" AND GRADING OF MIXED PARTICLES ARISES.

  • Authors:
    • HUYET, G
    • PREVOSTEAU, J M
    • GATEAU, C

Language

  • French

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 01295350
  • Record Type: Publication
  • Source Agency: Institut Francais des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)
  • Files: ITRD
  • Created Date: Nov 21 2010 4:59AM