DBPapers
DOI: 10.5593/SGEM2015/B11/S4.075

ASSESSMENT OF MERCURY LOAD REDUCTION CAPABILITIES IN THE HARD COAL PREPARATION PROCESS

K. Kurus, B. Bialecka
Wednesday 5 August 2015 by Libadmin2015

References: 15th International Multidisciplinary Scientific GeoConference SGEM 2015, www.sgem.org, SGEM2015 Conference Proceedings, ISBN 978-619-7105-31-5 / ISSN 1314-2704, June 18-24, 2015, Book1 Vol. 1, 591-598 pp

ABSTRACT
Poland remains the biggest hard coal producer in EU, producing 73 Mt of this resource in 2014. Furthermore Poland imports every year 10 – 15 Mt of coal. Strong carbonization leads to significant emission of toxic substances to atmosphere such as mercury.
Mercury compounds are recognized as one of the most toxic substances in hard coal and lignite. The United Nations Environmental Programme suspects the utilization of coal in global economy for being the source of 25 % of global Hg emission.
Due to the carbonization of Polish economy it might be supposed the coal utilization is responsible for even 90 % of air mercury pollution. It is predicted that Poland’s Hg emission varies between 10 and 25 tons annually.
Minamata Mercury Convention is the agreement to reduce global pollution of mercury. Every signatory is obliged to implement a national reduction programme of atmospheric Hg emission. The act necessitates the research of potential minimization of Hg atmospheric emission even at the precombustion stage for example in the coal preparation processes.
Coke producers in Poland demand the coking coal to be completely enriched. All Polish collieries extracting coking coal are equipped with infrastructure to wash all size fractions of the feed. However there are still thermal coal mines which are not capable of enrichment size fractions under 20 mm, not to mention about fine coal processing. It is estimated that circa 60 % of hard coal utilized by power plants in Poland remains raw. The research of global scientific literature leads to conclusion the effectivity and potential of mercury reduction in the processes of coal preparation must be determined.
The article is the trial of assessment of potential reduction of mercury based on the Hg content results of raw coal, products and coal preparation waste taken in different preparation plants. The preliminary analysis concerned 3 collieries equipped with different size fraction enrichment capabilities. The comparison of mercury content in raw coal, products and waste allowed us to evaluate the effectivity of Hg reduction in different models of preparation range.
• Model E1 – coal enrichment above 20 mm size fraction,
• Model E2 – coal enrichment above 1 mm size fraction,
• Model E3, K – full enrichment capabilities.

Keywords: Mercury reduction, Coal preparation, Precombustion, Poland

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