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Your search keyword '"Janakova, Iva"' showing total 14 results
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14 results on '"Janakova, Iva"'

2. Utilisation of Acidithiobacillus Ferrooxidans Bacteria for Bioleaching of Waste Materials from Silver-Bearing Ore Mining

Author

Janakova, Iva, Fejfarova, Barbora, Sigut, Oldrich, and Cablik, Vladimir

Abstract

The extraction and processing of silver minerals produce significant amounts of waste, which poses environmental challenges due to their low metal content and the potential release of toxic elements. The study investigates the application of Acidithiobacillus ferrooxidans (AF) bacteria to the bioleaching of these waste materials, with the aim of maximizing the recovery of iron, copper and arsenic. The objectives of the study include characterizing waste materials, optimizing the bioleaching process parameters and evaluating metal extraction efficiency. The samples were leached with additives (CuSO4 5H2O and AgNO3) to accelerate the kinetics of metal dissolution in solution and reduce the bacterial leaching time. The results showed that samples 1-2 and 2-2 containing additives had higher values of dissolved iron and copper in the leachate compared to samples 1-1 and 2-1 without additive application.

Published
2023
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7. Колонная флотация угля

Author

Fečko Peter, Pertile, Eva, Bedeković, Gordan, Janakova, Iva, and Mucha, Nikolas

Subjects
колонной флотомашине, собирателей, угля
Abstract

Исследуется флотируемость каменного угля из шахты Lazy при использовании собирателей Flotalex, Montanol и PE2. Цель работы состояла в подтверждении флотируемости упомянутого угля и елективности названных собирателей. Исследования проведены на классе -0, 5 мм в колонной флотомашине. Результаты флотации показали, что Flotalex и Montanol обеспечивают примерно одинаковое извлечение, при этом Flotalex обладает лучшей селективностью. При использовании в качестве собирателя PE2 получены еудовлетворительные результаты.

Published
2010

8. Flotoflokulacja mulow weglowych

Author

Fečko, Peter, Janakova, Iva, Vojtkova, Hana, Bedeković, Gordan, and Tora, Barbara

Subjects
flotoflokulacja, mulow weglowych, flokulantów
Abstract

Celem badań bylo określenie wyników wzbogacania wegla w procesie flotoflokulacji. Zasada flotoflokulacji polega na zastosowaniu w pierwszym etapie flokulanta, a nastepnie poddaniu uzyskanych flokul procesowi flotacji. Wzbogacanie przeprowadzono za pomoca trzech odczynników flotacyjnych (Montanol, Flotalex MR2, Ekofol 440) oraz trzech flokulantów (Superfloc A120, Praestol 2935, Sokofloc 26BH). Przyjeto, že uzyskany koncentrat weglowy ma miec zawartość popiolu nie wyzsca niz 10%. Flotacje przeprowadzono w laboratoryjnej, kolumnowej maszyne flotacyjnej.

Published
2010

9. Column flotation of bituminous coal

Author

Fečko, Peter, Tora, Barbara, Bedeković, Gordan, Mucha, Nikolas, Janakova, Iva, and Mayka Irina Bautista Betancur

Subjects
flotation, column, bituminous coal, column flotation, bitominous coal
Abstract

The objective of the paper was a comparison of classical and column flotation on samples of black-coal slurries from selected localities of okr and poland. Namely they are dukla mine, darkov mine, csm mine, csa mine, doubrava mine and kleofas mine. The acquired results imply that the methods of classical and column flotation are suitable for flotation of the slurries in question as all the tested black coal slurries from okr and poland are cokeable coals with a high flotation ability.

Published
2008

13. APPLICATION OF FLOTATION AND BACTERIAL LEACHING TO ELIMINATE PERSISTENT ORGANIC POLLUTANTS IN THE INFLUENT STREAM OF CERNY PRIKOP.

Author

Janakova, Iva, Vojtkova, Hana, and Fecko, Peter

Subjects
*SEDIMENTS, *POLLUTANTS, *PSEUDOMONAS, *RHODOCOCCUS, *BACTERIAL leaching
Abstract

The paper deals with decontamination of sediments polluted by persistent organic pollutants in the influent stream of Cerny prikop in Ostrava, the Czech Republic. Flotation is used as the first stage treatment method when the individual contaminants accumulate in the flotation concentrate. Consequently, bacterial leaching applying the bacteria of genus Pseudomonas and Rhodococcus is used as the second treatment method. The results imply that the combination of both the methods is very effective and leads to a removal of up to 90% of PAHs, PCBs and C10-C40. [ABSTRACT FROM AUTHOR]

Published
2011
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14. FLOTATION OF SEDIMENTS FROM THE CERNY POTOK STREAM.

Author

Janakova, Iva, Fecko, Peter, Mucha, Nikolas, and Tora, Barbara

Subjects
*SEWAGE sludge, *ENVIRONMENTAL degradation, *SEDIMENTS, *POLLUTION
Abstract

The paper deals with an evaluation of flotation application suitability in the sludge decontamination from the Cerny Potok situated in the City of Ostrava. Flotation of organic pollutants is very effectual and more than 70 % of NEL, 90 % of PCB and 80 % of PAH from the sediments was removed. [ABSTRACT FROM AUTHOR]

Published
2010

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