Trace elements in solid waste products from coal burning at some Bulgarian thermoelectric power stations
✍ Scribed by Stanislav V. Vassilev
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 964 KB
- Volume
- 73
- Category
- Article
- ISSN
- 0016-2361
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✦ Synopsis
Maritza East lignite coal, described earlier3*'. FA and BA removed by hydraulic transport (in BD these are also removed by conveyers and dumpers in a dry state) are deposited in ash depositories.
Average samples were composed of a large number of single samples (30-70), and were taken at different time intervals (up to eight years). Samples were collected as follows: BA from under combustion chambers; FA from electrostatic precipitator hoppers and mechanical collectors; LA from depositories (taken on a set of points at different depths); coal mixtures (CM) and host rocks from TPS bunkers; coals, host rocks and slime from bunkers and depositories of the Bobov Do1 coal concentrating mill; soils near TPS, grass vegetation and water from the ash depositories.
The following methods were used: screen sieving, heavy liquid and magnetic separation; ash determination; atomic emission and ICP spectroscopy; X-ray fluorescence, potentiometric, wet chemical and instrumental neutron activation analyses; crystallo-optical, powder XRD, SEM, TEM, etc. studies, reported earlierim4.
RESULTS AND DISCUSSION
Clarke contents were used for pointing out the trace element concentration trends and for comparison. For brown coal (for CM comparison) and derived ashes (for comparison of CM ash, host rocks, FA, BA and LA) the ~~6-236~~94~03jO367-os 0 1994 Rutterworth-Heinemann
Ltd.