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Assessment of coal slurry deposits energetic potential and possible utilization paths

100%

Lutynski A. , Lutynski M.

Physicochemical Problems of Mineral Processing

2014

tom Vol. 50, iss. 1

159--168

Coal-slurries and post-flotation mud have the highest carbon content among other mine waste produced during coal mining and preparation. Therefore, coal slurries deposited in impoundments can be regarded as potential fuel. In the article methods of energetic potential assessments of raw and beneficiated coal slurry deposits were discussed. Results of such assessment for 21 impoundments were presented and the loss of energetic potential due to the imperfection of beneficiation method was discussed. The lowest losses were observed for beneficiation by froth flotation where the loss of energetic potential was on average 15%. The highest loss was observed for beneficiation in centrifugal separators where on average it was 68%. Possible paths of utilization of such slurries in Polish national fuel balance were studied using the SWOT analysis. The results of the SWOT analysis indicate that the internal factors, i.e. the ones related to the coal slurry processing technology have much lower impact on the possibility of using coal slurry deposits in the national fuel balance. Instead, according to the experts, external factors have much greater impact.

Badanie niektórych struktur powierzchniowych i funkcji limfocytów poddawanych zamrażaniu w steropianowym pojemniku

80%

Lutynski A. , Dwilewicz-Trojaczek J. , Ciok M.

tom 24

nr 4

Określanie wartości energetycznej Sorghum saccharatum (L.) Moench, Zea mays L. i Malva verticillata L.

80%

Kozlowski S. , Zielewicz W. , Lutynski A.

Łąkarstwo w Polsce

2007

tom 10

Investigation of coal slurry properties deposited in impoundments located in the upper silesian coal basin

80%

Lutynski A. , Suponik T. , Lutynski M.

tom Vol. 49, iss. 1

23--35

Results of investigation of physical, chemical and energetic properties of steam and coking coal slurries deposited in twenty Polish impoundments are presented in the paper. Coal slurry was sam-pled in accordance with a certain procedure from different locations and depths at each impoundment whereas laboratory investigation was performed on averaged samples. The performed investigation in-clude determination of chemical composition, moisture content, volatile matter, sulfur and calorific value at various states. Additionally, properties of coal slurry of particle size below 0.1 mm are presented. The average content of this fraction is approximately 62% and ranges at individual impoundments from 28 to 79%. An average calorific value in analytical state of coal slurries deposited in impoundments in the fraction below 0.1 mm is rather high (12.01 MJ/kg on average) in comparison to the average calorific value of impoundments in analytical state i.e. 16.4 MJ/kg. Average ash and sulfur contents of the coal slurries in analytical state is on average: 42.5% and 1.0% respectively. Transient moisture content of coal slurries in the analytical state is on average 22%, whereas the average volatile matter content is 20.0% Chemical composition is typical for coal tailings with low Al2O3 and TiO2 content. The results indicate considerable variations in the quality of coal slurries deposited in different impoundments due to different geology of coal deposits of the mines. For individual impoundment these differences are smaller which is demonstrated by a lower variation in the standard deviation.