Abstract

The simultaneous grinding/agglormeration process has been used to beneficiate Minto coal. Experiments with the Szego Mill, a planetary ring-roller mill with grooved rollers, have given good results. Different roller ridge/groove sizes have been tested and favourable oil-coal-water ratios established. Ash removal is closely related to grinding performance. Very short mill residence times, of the order of 10 seconds, are sufficient for microagglomerate formation. Considerable equipment and operating cost savings are possible with the modified process. On a utilise le procede de pulverisation et d'agglomeration simultanees en vue de valoriser le charbon Minto. Les experiences menees avec le broyeur Szego, un laminoir planetaire a cylindres annulaires et canneles, ont donne de bons resultats. Differentes tailles de cannelure et d'arěte ont ete testees et des rapports huile-charbon-eau favorables ont ete etablis. La recuperation des cendres est etroitement liee a la performance de la pulverisation. Des temps de sejour dans le broyeur tres courts, de l'ordre de 10 secondes, sont suffisants pour la formation de microagglomerats. Ce procede modifie permet des economies d'equipement et de temps de fonctionnement considerables.

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