Microwave heating of coal for enhanced magnetic removal of pyrite

Uslu T., Atalay U.

FUEL PROCESSING TECHNOLOGY, vol.85, no.1, pp.21-29, 2004 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 85 Issue: 1
  • Publication Date: 2004
  • Doi Number: 10.1016/s0378-3820(03)00094-8
  • Journal Name: FUEL PROCESSING TECHNOLOGY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.21-29
  • Keywords: coal desulfurization, microwave heating, magnetic separation, DESULFURIZATION, MOSSBAUER
  • Middle East Technical University Affiliated: No

Abstract

Amenability of Askale coal to desulfinization by magnetic separation following microwave heating was investigated. The coal was subjected to magnetic separation at 2 T following the treatment in a microwave oven at 850-W power and 2.45-GHz frequency. The increase in magnetic property by microwave heating at 850 W and 2.45 GHz was not sufficient to enhance the removal of considerable amount pyritic sulfur from the coal by magnetic separation at 2 T. Pyritic sulfur content was reduced by 37.46%. With the addition of 5% magnetite, which is an excellent microwave absorber mineral, microwave heating was enhanced and pyritic sulfur content of coal was reduced by 55.11%, by magnetic separation at magnetic field intensity of 2 T following the microwave heating. In addition, 21.54% decrease in ash content and 20.39% increase in calorific value also resulted. (C) 2003 Elsevier Science B.V. All rights reserved.