STUDY ON RECOVERY OF ALUMINA GRAINS AND FIBERGLASS FROM REJECTED AND USED ABRASIVE DISCS
DOI:
https://doi.org/10.59957/jctm.v60.i5.2025.11Keywords:
abrasive discs, waste recovery, aluminum oxide, phenol formaldehyde resin, pyrolysisAbstract
A method was developed for the quantitative regeneration of Al2O3 from rejected and spent abrasive discs by pyrolysis. It overcomes the shortcomings of the method described in the literature, namely, the pyrolysis of the abrasive waste takes place without its preliminary crushing and, the pyrolysis takes place at the same speed on the surface of the disc as in volume. This method allows recovering of alumina, fiberglass mesh and cryolite. SEM images of regenerated and virgin Al2O3 show similar sharp edges. The results from the elemental analysis revealed that the content of elements in virgin Al2O3 and in the recovered one are the same. Size and orientation characterization of recovered Al2O3 and virgin Al2O3 is reported. The recovered alumina was used for the preparation of cutting abrasive discs. The examination results revealed that all tested disks meet the corresponding standards.
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