3 research outputs found

    Preferowany spos贸b czyszczenia w臋gla metod膮 flotacji: olej sosnowy czy MgCl.?

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    Coal flotation using inorganic salts receives special attention. It utilizes coal hydrophobicity to float coal without adding collectors. Although different salts were tested, chloride salts are the most promising ones. However, the stabilization of froth layer using the salts only is dubious. erefore, in this study, the flotation of coal was tested using either magnesium chloride or pine oil as a frother to see if there is a difference in coal flotation between these reagents in terms of ash removal and coal recovery in the float fraction. Additionally, both magnesium salt and pine oil were added together to clarify their interactive effect using statistical design. e results proved that the presence of either reagent (i.e., pine oil or MgCl.) is significant in reducing the ash content and increasing coal recovery. Using the MgCl. only reduced the ash to less than 4.3% with a coal recovery up to 28% while adding 1.0 kg/t pine oil along with 4 kg/t MgCl. enhanced the reduction of ash to less than 3% with a coal recovery of up to 80% at pH 2.Szczeg贸ln膮 uwag臋 po艣wi臋ca si臋 flotacji w臋gla przy u偶yciu soli nieorganicznych. Wykorzystuje hydrofobowo艣膰 w臋gla do flotacji w臋gla bez dodawania kolektor贸w. Chocia偶 testowano ro偶ne sole, najbardziej obiecuj膮ce s膮 sole chlorkowe. Jednak stabilizacja warstwy piany wy艂膮cznie za pomoc膮 soli jest w膮tpliwa. Dlatego w tym badaniu flotacja w臋gla by艂a testowana przy u偶yciu chlorku magnezu lub oleju sosnowego jako spieniacza, aby sprawdzi膰, czy istnieje r贸偶nica we flotacji w臋gla mi臋dzy tymi odczynnikami pod wzgl臋dem usuwania popio艂u i odzysku w臋gla we frakcji flotacyjnej. Dodatkowo dodano razem zar贸wno sol magnezow膮, jak i olejek sosnowy, aby wyja艣ni膰 ich interaktywny efekt przy u偶yciu projektu statystycznego. Wyniki dowiod艂y, 偶e obecno艣膰 ka偶dego z odczynnik贸w (tj. oleju sosnowego lub MgCl.) ma znacz膮cy wp艂yw na zmniejszenie zawarto艣ci popio艂u i zwi臋kszenie odzysku w臋gla. Zastosowanie MgCl. tylko zmniejszy艂o popi贸艂 do mniej ni偶 4,3% z odzyskiem w臋gla do 28%, podczas gdy dodanie 1,0 kg/t oleju sosnowego wraz z 4 kg/t MgCl. zwi臋kszy艂o redukcj臋 popio艂u do mniej ni偶 3% przy odzysku w臋gla do 80% przy pH 2

    Impact of the Adsorption of Bacteria on Enhancing the Separation Selectivity of Dolomite and Apatite

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    The surface modification of minerals by bacteria has recently been examined in an attempt to improve their separation selectivities. In this paper, a study of the effect of Corynebacterium diphtheriae intermedius (CDI) bacteria on the dolomite/apatite separation process is reported. Bacterial interaction with both minerals was investigated employing Fourier-transform infrared (FT-IR) spectroscopy together with measurements of the adsorption isotherm and the zeta potential. FT-IR methods were used to identify the functional groups on the surface of each mineral before and after the adsorption of bacteria, while the adsorption isotherm and the zeta potential were used to illustrate the type of adsorption process involved, i.e. physical versus chemical adsorption. The application of bioflotation processes to natural ores using CDI bacteria can lower the MgO content of the ores to less than 1%
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