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The Influence of Dielectric Properties on Heating of Sulphide Ores in Electromagnetic Field

Znamenackova Ingrid, Dolinska Silvia, Lacik Jaroslav, Hredzak Slavomir, Briancin Jaroslav

Inżynieria Mineralna

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2024

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Vol. 1, no. 1

43--49

EN

Microwave heating is a form of high-frequency electromagnetic radiation. The heating of primary and secondary mineral raw materials in the microwave field depends primarily on their dielectric and thermal properties. The condition is the absorption of microwave radiation. Dielectric heating of materials occurs immediately after placing them in an electric high-frequency field. Knowledge of the dielectric characteristics of mineral raw materials is an important assumption for the use of electromagnetic radiation at the intensification of technological treatment methods. Most mined minerals consist of several mineral components that have different dielectric properties. Most sulphides are well heated in a microwave field. Conversely, tailings components of ores, such as quartz, are transmission materials. The study of dielectric properties involves measurements of the complex relative permittivity ε*, which consists of a real and an imaginary part. The imaginary part of permittivity “loss factor” represents the measure of dielectric losses in the material. Microwave heating of sulphide ores and concentrates such are chalcopyrite, tetrahedrite, galena depends on their chemical composition and content of impurities. The article describes the influence of dielectric properties on heating of chalcopyrite in microwave field. SEM analyses of studied samples are presented.

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Brief Characterisation of Ochre from the Marta Adit (Nižná Slaná, Spiš-Gemer Ore Mts., Eastern Slovakia)

Hredzak Slavomir, Matik Marek, Stestinova Ol'ga, Kupka Daniel, Bartova Zuzana, Hagarova Lena, Zubrik Anton, Znamenackova Ingrid, Dolinska Silvia

Inżynieria Mineralna

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2024

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Vol. 1, no. 1

1--6

EN

The contribution deals with the study on composition of ochre sample from the Marta adit at Nižná Slaná. Three samples were prepared from ochre by hand picking and screening, which were subjected to GA, AAS, XRF and XRD. Salts precipitated on surface at drying contain 17.7 % S (53 % as SO4), 16.5 % MgO, 13.6 % Fe2O3, 3.54 % CaO and 1 % MnO. As to mineral composition, sulphates such as gypsum, starkeyite and rozenite are dominant. The fraction of grain size under 250 micron contains 30 % Fe2O3, 28.6 % SiO2, 8 % Al2O3, 6.6 % CaO, 2.9 % MgO and 1.95 % S. Notable is content of arsenic in this fraction, which attain as high as 1.84 %. Quartz and gypsum occur as dominant crystalline phases. As to coarser fraction, i.e. under 150 microns, 44.5 % SiO2, 16.8 % Fe2O3, 11.3 % Al2O3, 6.9 % CaO, 2.4 % MgO a 2.3 % C were assayed. Dominant quartz is accompanied by mica, plagioclase, ankerite and dolomite. It was shown that arsenic is bonded in finer grain size fraction.

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Study of Extraction of Rare Earth Elements from Hard Coal Fly Ash

Znamenackova Ingrid, Dolinska Silvia, Hredzak Slavomir, Cablik Vladimir, Lovas Michal, Gesperova Dana

Inżynieria Mineralna

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2020

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no. 1, vol. 2

229--232

EN

Rare earth elements (REEs) extraction from wastes and/or by-products is alternative possibility of their winning. The occurrence of REEs, namely 50.1 ppm of La, 100.1 ppm of Ce and 44.3 ppm of Nd was confirmed in solid fly ash samples from the coal fired heating plant (TEKO, Inc. Košice, eastern Slovakia). The submitted contribution presents laboratory results of REEs leaching from coal fly ash using 3M HCl, HNO3, H2SO4 and H3PO4 at 80°C during 120 min. It was found, that recoveries 65.5% of La, 64.4% Ce and 64.3% of Nd into liquor may be attained after grain size reduction to below 5 μm.

PL

Ekstrakcja pierwiastków ziem rzadkich (REEs) z odpadów oraz/albo z produktów jest alternatywną możliwością ich uzyskania. Obecność REEs, konkretnie 50,1 ppm La, 100,1 ppm Ce oraz 44,2 ppm Nd została potwierdzona w próbkach popiołu z węgla z elektrociepłowni (TEKO, Inc. Košice, wschodnia Słowacja). Prezentowany artykuł pokazuje wyniki laboratoryjne ługowania REEs z popiołu węglowego za pomocą 3M HCl, HNO3, H2SO4 oraz H3PO4 w 80°C w czasie 120 minut. Odkryto, że odzysk 65,5% La, 64,4% Ce oraz 64,3% Nd w formie ciekłej może być osiągnięte przy redukcji wymiaru ziaren do poniżej 5 µm.

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Possibilities of Siderite and Barite Concentrates Preparation from Tailings of Settling Pit Nearby Markušovce Village (Eastern Slovakia)

Hredzak Slavomir, Dolinska Silvia, Znamenackova Ingrid, Lovas Michal, Sestinova Olga

Inżynieria Mineralna

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2019

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R. 21, nr 1

19--24

EN

The contribution deals with recovery of useful minerals such as siderite and barite from tailings collected in settling pit nearby Markušovce village (East Slovakia). The material form the pit was subjected to gravity pre-concentration and magnetic separation under laboratory conditions with the aim to verify a possibility of siderite and barite concentrates preparation. A fraction of +0.2–1 mm forming a 40.56 wt% of total grain size scale of the material from the pit and containing 35.71% SiO2, 22.55% Fe2O3, 7,12% Al2O3, 5.48% Ba, and 3.89% SO42– was tested in upgrading process. Thus, 78.18% of SiO2, and 60.41% of Al2O3 at loss 21.70% Fe2O3 and 2.09% of Ba were removed in gravity pre-concentration. The iron concentrate with the content of 44.33% Fe2O3 at Fe recovery of 77.29% in magnetic product was obtained. Barite pre-concentrate with the Ba content of 46.21% at Ba recovery of 91.95% in non-magnetic product was won.

PL

Artykuł dotyczy możliwości odzysku minerałów użytecznych takich jak syderyt i baryt z odpadów zdeponowanych osadniku w pobliżu miejscowości Markušovce (Słowacja Wschodnia). Materiał z odwiertu poddano wstępnemu wzbogacaniu grawitacyjnemu i separacji magnetycznej w warunkach laboratoryjnych w celu weryfikacji możliwości uzyskania koncentratów syderytu i barytu. Klasa ziarnowa 0,2-1 mm ma wychód 40,56% wagowo i zawartość 35,71% SiO2, 22,55% Fe2O3, 7,12% Al2O3, 5,48% Ba i 3,89% SO42- była poddana wzbogacaniu. Uzyskano koncentrat o uzysku 78,18% SiO2 i 60,41% Al2O3 . We wstępnym wzbogacaniu grawi- tacyjnym usunięto 21,70% Fe2O3 i 2,09% Ba w stężeniu grawitacyjnym. Otrzymano koncentrat żelaza o zawartości 44,33% Fe2O3 przy uzysku Fe 77,29% w produkcie magnetycznym. Uzyskano koncentrat wstępny (produkt niemagnetyczny) barytu o zawartości Ba 46,21% i uzysku 91,95%.