Evaluation of Thrace Region fine coal tailings

Year 2018, Volume: 157 Issue: 157, 207 - 215, 15.12.2018

Murat Olgaç Kangal , Mustafa Özer Fırat Burat Soner Akın

https://doi.org/10.19111/bulletinofmre.428324

Cited By: 1

Abstract

The 79.9% of lignites in Turkey possesses a calorific value lower than 2500 kcal/kg. In order to reduce the energy dependence of the country, it would be right to evaluate these lignite reserves of 11.8 billion tons by effective coal preparation methods and use them with clean coal combustion systems together with developing technology. A typical coal preparation plant produces material within a ratio of 20% of the feed coal below 0.5 mm. Generally, due to the high cost, the gain of the fugitive coal in the product under this size is not preferred but this size group can be utilized owing to the developing coal cleaning technologies. Within scope of this study, the discarded coal slime below 0.5 mm size taken from the Uysal Mining Co. in Tekirdağ was subjected to the enrichment and dewatering processes to obtain a marketable product.  In experimental studies, the slime with 81,25% ash content in 150 micron size group was removed from the system in order to produce a high quality product. Afterwards, the coal having 49.09% ash content was subjected to multistage Reichert Spiral tests and a clean coal product with 24,1% ash content was produced. In settling experiments, the product below 150 microns was used and at the end of these tests, the slurry with 30% solid in pulp ratio was produced. It can be concluded that the clean coal, which is produced after enrichment tests, could be used in energy sector, power plants, briquetting plants, cement plants etc.

Keywords

Lignite, tailings, Reichert spiral, dewatering

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