Consecutive thermomagnetic beneficiation of Turkish lignites

✍ Scribed by D. Renda; G. Onal; I. Mustafaev

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 71 KB
• Volume: 80
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/s0016-2361(00)00144-7

✦ Synopsis

The results of investigations of bene®ciation regularities of Tavs Ëanlõ-Omerler lignites in a two-stage consecutive process of heat treatment and magnetic separation are presented. After thermal treatment of lignite samples in a rotary kiln at temperatures ranging from 370 to 6508C, the application of the REMS magnetic separator produces a product higher in calori®c value (6727 kcal/kg) and lower in sulphur (1.27%) and ash (8.5%) content. The mechanisms of the process have been investigated by scanning electron microscopy, chromatography, electron spin resonance, X-ray diffractometry, derivatography and chemical analysis.

The ef®ciency of the bene®ciation processes can be explained by the improvement of magnetic properties of pyrite during heat treatment due to oxidation T , 4008C and decomposition T . 4008C of pyrite and compact distribution of part of organic sulphur around pyrite grains.