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

Lutynski A., Suponik T., Lutynski M.

Physicochemical Problems of Mineral Processing

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2013

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Vol. 49, iss. 1

23--35

EN

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.

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Analysis of selected methods of beneficiating coal slurries deposited in impoundments

Szpyrka J., Lutynski M.

Physicochemical Problems of Mineral Processing

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2012

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Vol. 48, iss. 2

579-589

EN

The paper presents research results of the possibility to beneficiate coal slurries deposited in 21 impoundments located in the region of Silesia, Poland. Coal slurries of particle size diameter below 1 (0.5) mm were subjected to beneficiation tests with the use of the following methods: centrifugal separator, hydrocyclone, Reichert spiral separator and flotation. Applied methods showed significant differences in obtained results. The most effective method was flotation where yield was on average 64% with concentrate of high calorific value. In case of centrifugal separator and Reichert type spiral average yield was 22% and 25%, respectively. In case of hydrocyclone classifier-separator, a high yield of low quality concentrate was obtained. The study revealed that such impoundments have a high energetic potential which can be effectively used by applying a proper beneficiation technology.

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Elemental and mineral inventory of tailing impoundments near Pezinok, Slovakia and possible courses of action for their remediation

Majzlan J., Brecht B., Lalinska B., Chovan M., Moravansky D., Uhlik P.

Mineralogia

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2010

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Vol. 41, iss. 1/2

55--74

EN

An effective remediation strategy for a polluted site should take the absolute amount of the pollutant(s) into account. Here, we present an elemental budget for As, Sb and Fe in two tailing impoundments of the former Sb-Au deposit near Pezinok, Slovakia. The two impoundments contain 5,740 X103 kg As, 6,360 X103 kg Sb and 50,105 X103 kg Fe. An estimated total Au content in the impoundments is 132 kg. The most abundant minerals in the tailings are quartz, illite, and chlorite. The content of carbonates in the tailings is 3.5-10.5 wt% calcite equivalent and we estimate that the carbonates are sufficiently abundant to buffer the pH at circumneutral values, up to the point when all pyrite decomposes. The possible courses of action are i) do nothing, ii) build an active barrier to capture the released As and Sb, iii) isolate the impoundments from rain and ground water and iv) use the impoundments as a source of Sb and redeposit the waste in a safer form. The simplest approach is to do nothing, which seems to be the most likely course of events, given the current economic, political and societal state of the Slovak Republic. Although this action costs nothing in the short term, it may cause significant damage to the environment, especially to the alluvial sediments and associated water resources in the long term.