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Statistical Analysis of Selected Coal Charateristics and Toxic Compounds for FGX Air-Vibrating Separation

Mijał Waldemar, Niedoba Tomasz, Polek Daria, Baic Ireneusz, Blaschke Wiesław

Inżynieria Mineralna

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2023

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no. 2, vol. 1

377--387

EN

Dry beneficiation methods were popular in the first part of the 20th century. In the 1930s, before World War II, dry separators were used more commonly in the United States. Currently, this method is very popular in China, the United States, India, Russia and other places where its implementation is possible. In Poland, by contrast, dry separation still remains uncommon. However, during the last 30 years, dry separators have started to be more commonly used in coal beneficiation. One example of this type of separator might be the FGX air-vibrating separator. This type of separator uses air suspension to separate heavier particles (tailings) from lighter coal grains. The process of dry separation may depend on various parameters, e.g. particle size fraction, air supply, feed parameters, etc.. This paper describes the mathematical model which shows the scope for using this separation method for coal beneficiation. Mathematical models are based on dependencies between calorific value and ash content in the samples tested as well as relations between arsenic, thallium, mercury, lead and other coal characteristics. The latter parameters are of vital importance as Polish emission standards do not have any limits for the elements mentioned above (arsenic, thallium, mercury and lead).

PL

Suche metody wzbogacania były popularne w pierwszej połowie XX wieku. Separatory suche były używane zwłaszcza przed II Wojną Światową w latach 30-ych w USA. Obecnie, metoda ta jest bardzo popularna w Chinach, USA, Indiach, Rosji oraz w innych miejscach, gdzie możliwe jest jej zastosowanie. W Polsce proces ten jest wciąż bardzo mało popularny. Podczas ostatnich 30 lat systemy wzbogacania węgla zaczęły szerzej korzystać z separatorów suchych a przykładem bardzo popularnego urządzenia tego typu jest FGX – wibracyjny stół powietrzny. Ten typ separatora korzysta z zawiesiny powietrznej w celu wydzielenia cięższych ziaren (odpadów) od lżejszych ziaren węgla. Sucha separacja może zależeć od różnych parametrów, tj. klasa ziarnowa, zasoby powietrza, parametry nadawy itp. Artykuł ten opisuje model matematyczny, który pokazuje możliwości zastosowania tej metody separacji przy wzbogacaniu węgla. Modele matematyczne oparte były na zależnościach pomiędzy wartością opałową oraz zawartością popiołu w testowanych próbkach, jak również na relacjach pomiędzy zawartościami arsenu, talu, rtęci, ołowiu i innych charakterystyk węgla. Ostatnie parametry są bardzo ważne ponieważ polskie standardy emisji nie zawierają limitów dla pierwiastków wymienionych powyżej, a więc arsenu, talu, rtęci oraz ołowiu.

2

Advanced Oxidation Treatment of Composting Leachate of Food Solid Waste by Ozone-Hydrogen Peroxide

Gliniak Maciej, Lis Anna, Polek Daria, Wołosiewicz-Głąb Marta

Journal of Ecological Engineering

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2019

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Vol. 20, nr 5

203--208

EN

The research was conducted to investigate the efficiency and possibilities of advanced oxidation process based on ozone-hydrogen peroxide. The process was used as a post-treatment step of composting leachate utilisation. The leachate samples were collected from a typical composting plant with the aerobic biological treatment system. The samples were conditioned in a “ozone reactor” without dilution. The effectiveness of the treatment process was measured by pH values (4.0-7.0), H2O2 concentrations (0.5-4.0 g∙dm-3), ozone doses (0.5-1.5 g∙h-1) and reaction times (0-10 min). The highest removal efficiencies achieved were 85% and 92% for chemical oxygen demand (COD) and biochemical oxygen demand (BOD5), respectively. The optimum process parameters occurred at pH 5.0, 2.0 g∙dm-3 concentration of H2O2, and 0.75 g∙h-1 of ozone dose. The optimal reaction time was 3 min. The O3/ H2O2 advanced oxidation process was found to oxidize COD and BOD5 of the composting leachate. The oxidation reaction can be used as a feasible technique for composting leachate treatment.

3

Comparison of Vietnam and Poland Industrial Wastewater Regulation: a Study of Trang Bach Coal Mine Wastewater Treatment

Ha Doan Manh, Mijał Waldemar, Polek Daria

Inżynieria Mineralna

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2019

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R. 21, nr 2/2

112--118

EN

The research about wastewater treatment in laboratory scale of Trang Bach coal mine in Vietnam was carried out in the year of 2016. We concluded the content of chemical compound that needed to treat the pH, Fe, Mn component and Turbidity & Suspended Solids (TSS) in the wastewater to meet the requirement of the Technical Regulation for Industrial Water of Vietnam. In this article, we suppose to compare the Vietnam and Poland regulations for industrial wastewater based on the result of our research about Trang Bach coal mine wastewater treatment before and then assess the potential to exchange the scientific works about wastewater treatment between Vietnam and Poland.

4

Comparison of Vietnam and Poland coal resources & coal demand in the past and how it will change in future

Mijał Waldemar, Polek Daria, Ha Manh Doan

Inżynieria Mineralna

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2019

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R. 21, nr 2/2

129--134

EN

The article in individual chapters discuss domestic coal resources in Poland and Vietnam, types of coal occurrence in both countries, the processing status and main domestic mining companies. The last part will be a comparison of mining prospects and plans for the development of coal mining in both countries and a summary of positive practices in both countries.