Improved flotation of heat treated lignite with saline solutions containing mono and multivalent ions

• Autorzy: Ozdemir O. , Ersoy O. F. , Guven O. , Turgut H. , Cinar M. , Çelik M. S.

Identyfikatory

DOI

10.5277/ppmp18118

• Języki publikacji: EN

Abstrakty

EN

Flotation of lignites is inherently difficult. However, pre-heat treatment of coal is also known to make coal surfaces more hydrophobic possibly through removal of water entrapped in the structure of coal. In this context, the objective of this study was, therefore, to determine changes in the hydrophobicity of some lignites under moderately controlled heat treatment and correlate the flotation response of lignites in different salt solutions of NaCl, KCl, CaCl2, and MgCl2 without using any reagent. The results of flotation tests suggested that under the present test conditions, it was possible to float thermally pre-treated lignite samples of partially hydrophobic character in salt solutions in the absence of collector and frother. In addition, the effect of heat treatment on hydrophobicity, and in turn flotation was explained by a theoretical model based on extended DLVO interactions to quantify the effects of both heat treatment and salt concentration on bubble-particle interactions. The results of theoretical modeling suggested that the removal of hydrogen containing groups from coal surfaces significantly contribute to the electrical double layer and hydrophobic forces that govern the magnitude of energetic barrier and also the extent of bubble-particle attachment.

Słowa kluczowe

EN

flotation; heat treatment; lignite; DLVO; Saline Solutions

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Physicochemical Problems of Mineral Processing
• Rocznik: 2018
• Tom: Vol. 54, iss. 4
• Strony: 1070--1082
• Opis fizyczny: Bibliogr. 35 poz., rys., tab.

Twórcy

autor

Ozdemir O.

• Istanbul University

autor

Ersoy O. F.

• Istanbul University

autor

Guven O.

• Istanbul Technical University

autor

Turgut H.

• Istanbul Technical University

autor

Cinar M.

• Onsekiz Mart University

autor

Çelik M. S.

• Istanbul Technical University

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Uwagi

PL

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).