Characterization of Energy Efficiency in Microwave-Assisted Comminution

• Author / Creator

  Achina-Obeng, Rebecca

• Microwave technology has emerged as a promising tool in the mining and minerals processing industry, offering selective heating capabilities that induce fractures along grain boundaries. This innovative pretreatment method not only targets minerals selectively but also contributes to significant energy savings during subsequent grinding operations.
  This thesis focuses on interpreting the multifaceted benefits of microwave treatment, with a particular emphasis on energy efficiency and its impact on downstream processes. Through a case study on copper porphyry ore, crucial parameters such as particle size analysis were linked to notable energy savings in the comminution process, alongside an assessment of mineral liberation and flotation kinetics. Optimization tests were completed to determine the limitations of the pilot-scale microwave tests.
  Key observations include the correlation between microwave treatment efficiency and particle size, with relatively larger particles exhibiting better liberation benefits and particle size distribution. XRF analysis showed the elemental content of the sample. QEMSCAN analyses played an integral role in determining the extent of liberation achieved, particularly for particles passing the 2mm sieve size (-2 and +0.045) mm.
  A flotation recovery of 10.54 % was realized for the microwave treated sample as opposed to 4.06 % for the reference samples. This study not only provides valuable insights into the application of microwaves in mining and mineral processing but also highlights the potential for further innovation and optimization in this field. The continuous evolution of microwave technology underscores its growing significance as a sustainable and efficient solution in mineral processing operations.

• Subjects / Keywords

  • comminution
  • microwaves
  • energy
  • liberation
  • size-reduction
  • breakage
  • Copper-Porphyry
  • ore

• Graduation date

  Spring 2024

• Type of Item

  Thesis

• Degree

  Master of Science

• DOI

  https://doi.org/10.7939/r3-zb9q-0144

• License

  This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.