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    Wyświetlanie 1-13 z 13
    Tytuł:
    Mechanism of the combined effects of air rate and froth depth on entrainment factor in copper flotation
    Autorzy:
    Wang, Lei
    Xing, Yaowen
    Wang, Jun
    Powiązania:
    https://bibliotekanauki.pl/articles/1449999.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    froth flotation
    copper
    entrainment
    air rate
    froth depth
    Opis:
    The effect of air rate and froth depth on the entrainment factor in flotation has been extensively studied, but further investigation on the underlying mechanism for their effect is still required. In this study, flotation tests were performed at different air rates and froth depths in a 3 $dm^3$ continuously operated cell using an artificial copper ore. The results showed that entrainment factor was affected by both air rate and froth depth, and the combined effect of these variables on entrainment factor depended strongly on the particle size. The entrainment factor increased with either increasing air rate at a relatively shallow froth or decreasing froth depth at a relatively high air rate. At a very low air rate and deep froth, higher entrainment factor was observed for mid-size and coarse particles. When the entrainment factor was correlated to the effective liquid velocity at the pulp/froth interface, the results indicated that multiple mechanisms were responsible for the effect on entrainment factor. At a relatively high air rate and shallow froth depth, entrainment factor had a linear relationship with the interface effective liquid velocity, suggesting that drag force dominated the change in the entrainment factor when air rate and froth depth were varied. At a very low air rate and deep froth, the entrainment factor for fine particles was found to correlate strongly with the interface effective liquid velocity, while the entrapment of solid particles may be the main reason for the high entrainment factor for mid-size and coarse particles under this condition.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2020, 56, 1; 43-53
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acidified water glass in the selective flotation of scheelite from calcite, Part I: performance and impact of the acid type
    Autorzy:
    Kupka, Nathalie
    Möckel, Robert
    Rudolph, Martin
    Powiązania:
    https://bibliotekanauki.pl/articles/109345.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    acidified water glass
    scheelite calcite separation
    froth flotation
    Opis:
    To improve the performance of sodium silicate in scheelite flotation and allow the selective separation of scheelite from other semi-soluble salt-type minerals such as calcite, three acids, sulfuric, oxalic and for the first time hydrochloric are used to acidify sodium silicate (also called water glass). A literature review of previous usage of acidified water glass shows that no comparison between acids was made before, that comparisons with alkaline water glass were limited and that the idea that acidified water glass is more efficient at lower dosages has not been proven in scheelite flotation. As a consequence, the impact of the acid type, the ratio between acid and sodium silicate and acid dosage is tested in single mineral flotation and batch flotation experiments. All three acids allow a higher performance of acidified water glass compared to alkaline water glass at lower dosages and with little addition of acid: the tungsten recovery and grade are improved while silicates and to a lesser extent calcium-bearing minerals float less. The dosage of acid is less determining than the mass ratio of the acid to sodium silicate, except in the case of hydrochloric acid. Overall, the acid type does not matter as all three acids perform well in flotation, whereby oxalic and hydrochloric acid are better.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2020, 56, 2; 238-251
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the selection of the coarsest size class in flotation rate characterizations
    Autorzy:
    Orellana, Francisca
    Rivera, Marcelo
    Benítez, Matías
    Belmonte, Karyn
    Vinnett, Luis
    Powiązania:
    https://bibliotekanauki.pl/articles/24603662.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    flotation kinetics
    froth flotation
    coarse particles
    flotation rate distribution
    Opis:
    This paper studies size-by-size batch flotation kinetics for the separation of Cu at particle sizes +75 μm, investigating the responses in the -150/+75 μm, -212/+150 μm, -300/+212 μm, -355/+300 μm and +355 μm size fractions. The kinetic results were analyzed to identify classes limited by the maximum achievable recovery or low flotation rates. Combinations of these classes were investigated, emulating the selection of the coarsest size in a kinetic study. The impact of compositing size classes was discussed, emphasizing implications in the identification of difficult-to-float components. The -212/+75 μm classes reached steady recoveries at long flotation times, whereas the -355/+212 μm classes presented sustained increasing recoveries at extended flotation times. Flotation rate distributions in the -212/+75 μm classes exhibited mound-shaped distributions, indicating low fractions of rate constants close to zero (R∞-limited case). Conversely, the -355/+212 μm classes presented reverse J-shaped distributions, with a high fraction of valuable minerals with flotation rates close to zero (rate-limited case). Combining several size classes in the definition of the coarsest size fraction in kinetic characterizations proved to hide the flotation patterns of the less massive constituents (+212 μm classes). The +75 μm and +150 μm cumulative retained classes trended towards steady recoveries, consistently leading to mounded flotation rate distributions. This study highlighted the need for reliable methodologies to select size fractions in kinetic characterizations, as their arbitrary definitions may lead to a misinterpretation of the mineral losses when compositing classes with different flotation responses.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 5; art. no. 176950
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Froth flotation of Aljustrel sulphide complex ore
    Autorzy:
    Sousa, R.
    Futuro, A.
    Pires, C. S.
    Leite, M. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/109732.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    froth flotation
    mineral liberation
    flotation reagents
    complex sulphide ore
    Opis:
    Froth flotation of copper-zinc-lead ores is a complex process based on similar metallurgy processing and strong interactions between chalcopyrite and sphalerite. These types of ores represent 15% of the world production and 7.5% of copper deposits all over the world. In the present study, an attempt is made to assess the feasibility of froth flotation of a complex sulphide ore, where the effect of liberation grade as well as depressant, collector and frother dosage was studied. Copper flotation is dependent on the mineral liberation grade, which is significantly related with the size distribution. It was shown that longer grinding time increased the Cu grade but decreased the copper recovery due to the presence of very fine particles. Lime and sodium metabisulphite, used as depressants, allowed to achieve a good flotation performance. It was shown that for this type of ore lower dosage of the collector should be applied. Finally, a higher frother dosage led to a greater selectivity and reduced entrainment of very fine particles, but also caused low kinetic ratio and low recovery of valuable minerals. A well-defined flotation objective was imperative for a good liberation grade and reagents dosage selection, mainly for complex sulphide ores. A useful contribute was given to a better technical understanding of flotation of a complex sulphide ore from the Moinho deposit.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2017, 53, 2; 758-769
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A study of the effect of operating parameters in column flotation using experimental design
    Autorzy:
    Bedekovic, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/110943.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    froth flotation
    column flotation
    coal
    experimental design
    operating parameters
    Opis:
    The effect of air flow rate, pulp density and particle size was studied using central composite design for coal samples from the Lazy mine. Evaluation of column flotation tests was based on two dependant variables such as ash content and combustible matter recovery in the concentrate. The ash content in the concentrate was from 4.61 to 9.62% with the recovery of combustible matter from 17.43 to 81.98%. The ANOVA statistical analysis showed that the main effect of air flow rate has a significant impact on the combustible matter recovery and ash content in the concentrate. The main effect of pulp density on the combustible matter recovery is significant, whereas for the ash content it is not seen. There is a strong effect of the particle size on the ash content and combustible matter recovery in the concentrate. The interaction of the effect of the pulp density and particle size has a significant impact on the ash content in the concentrate.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2016, 52, 2; 523-535
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acidified water glass in the selective flotation of scheelite from calcite, part II: species in solution and related mechanism of the depressant
    Autorzy:
    Kupka, Nathalie
    Kaden, Peter
    Jantschke, Anne
    Schach, Edgar
    Rudolph, Martin
    Powiązania:
    https://bibliotekanauki.pl/articles/1845224.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    acidified water glass
    scheelite calcite separation
    froth flotation
    mechanism
    Opis:
    Sodium silicate is one of the main depressants against calcite and fluorite in the scheelite flotation industry. In the first part of this article, the authors acidified sodium silicate (AWG) with three acids (sulfuric, oxalic and hydrochloric) to improve its performance. Results showed that acidified water glass outperforms alkaline water glass in terms of selectivity: it increases mainly the grade by further depressing silicates and calcium-bearing minerals. In most cases, AWG requires lower dosages to do so. The effect of acidified water glass is evaluated through Mineral Liberation Analysis (MLA), froth analysis, Raman and Nuclear Magnetic Resonance (NMR) spectroscopy in order to hypothesize its mechanism. MLA shows that AWG affects silicates and sulfides more intensely than semi-soluble salttype minerals. Froth observations indicate other species in solution associated to the acid having an impact on the flotation results. Raman spectroscopy and NMR measurements indicate that the solution undergoes deep depolymerization when water glass is acidified. Lower molecular weight silica species, specifically Si-O monomers such as SiO(OH)3- will be responsible for the depression of the gangue minerals and are the drivers of the selectivity of AWG, more than orthosilicic acid. Depolymerization is more or less effective depending on the mass ratio of the acid to water glass and depending on the acid.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2020, 56, 5; 797-817
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Proposition of a bubble-particle attachment model based on DLVO van der Waals and electric double layer interactions for froth flotation modelling
    Autorzy:
    Buchmann, Markus
    Öktem, Gülce
    Rudolph, Martin
    Boogaart, K. Gerald van den
    Powiązania:
    https://bibliotekanauki.pl/articles/2146873.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    attachment
    froth flotation
    Hamaker constant
    surfactants
    collectors
    hydrophobic interaction
    Opis:
    The attachment of bubbles and particles represents one of the sub-processes in froth flotation among others (e.g. collision and detachment). The main interactions present at short distances in such a bubble-particle system are the van der Waals and electrostatic double layer interactions combined in the DLVO theory. In this study, the special features of the attachment process were discussed with a focus on flotation. For the van der Waals interactions, the Hamaker constants were calculated with the help of Lifshitz´ macroscopic theory as a function of the separation distance for specific material combinations. A specific material system (PbS-Water-Air) was used to demonstrate the implementation of bubble-particle attachment of the proposed modelling framework. The effects of additional surfactant/collector and air layers on the solid interface were presented. This framework of layered systems showed that the sign of van der Waals interaction could be turned from repulsive to attractive without the need to extend the DLVO theory. The thickness of the layer as a function of collector adsorption between a particle and a bubble is suggested as a modelling parameter in bubble-particle attachment efficiency.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 5; art. no. 154812
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flotation separation of enargite from complex copper concentrates by selective surface oxidation
    Autorzy:
    Li, Tangfei
    Zhang, Yansheng
    Zhang, Bo
    Jiao, Fen
    Qin, Wenqing
    Powiązania:
    https://bibliotekanauki.pl/articles/110698.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    mineralogy
    enargite
    selective surface oxidation
    froth flotation
    EDTA extraction
    Opis:
    In previous study, the promising results of separating enargite from non-arsenic copper sulfides were obtained using selective surface oxidation in pure mineral systems. However, this technology was not well understood in real ores or concentrates. In this study, the flotation separation of enargite from complex copper concentrates by selective surface oxidation was investigated. The effects of regrinding, pulp pH, NaClO concentration, conditioning time and flotation time on separation of enargite from NECu minerals were studied. The mineralogical characteristics of the flotation feed and products were showed as an instructive tool to understand the separation results. According to the results of EDTA extraction, the possible mechanism for separation of enargite from NECu minerals is that enargite is more resistant to oxidized compared to NECu minerals. The following order for the oxidation of NECu minerals and enargite is obtained: chalcopyrite (chalcocite, digenite)> enargite (covellite).
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 4; 852-864
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of flotation efficiency of phosphate minerals in mine tailings using polymeric depressants : experiments and machine learning
    Autorzy:
    Alsafasfeh, Ashraf
    Alagha, Lana
    Alzidaneen, Ala
    Nadendla, Venkata Sriram Siddhardh
    Powiązania:
    https://bibliotekanauki.pl/articles/2146912.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    phosphate tailing
    froth flotation
    polymers
    chitosan
    artificial neural networks
    Opis:
    In this study, direct froth flotation experiments were conducted on silicate-rich phosphate tailing samples. The average grade of P2O5 in the flotation feed was 21.6% as determined using a combination of spectroscopic techniques including X-ray powder diffraction (XRD), mineral liberation analysis (MLA), and scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM/EDS). Two polymers were selected to promote the depression of silicates and enhance the flotation of phosphates: in-house synthesized hybrid polyacrylamide (Hy-PAM) and chitosan. Flotation efficiency of phosphates was evaluated at different flotation conditions including depressant type, depressant dosage, pH, and the flotation time. Results indicated that the optimum flotation efficiency of phosphate minerals (84.6% recovery at 28.6% grade of P2O5) was obtained when Hy-PAM was utilized at the studied range of pH and flotation time. All datasets produced from the flotation experiments were integrated within the framework of machine learning (ML) using artificial neural networks (ANNs). The ANN platform was trained, validated, and successfully employed to predict the process outcomes in relation to the pulp and reagents characteristics, which in turn were used to determine the optimum values of process variables. Coefficient of determination (R2), mean absolute error (MAE), and root-mean-square error (RMSE) were used as model indicators. Optimization results showed that the peak flotation performance could be achieved at higher dosages of both polymers. However, lower pH and shorter flotation time for Hy-PAM, and higher pH and longer flotation time for chitosan, were predicted to give the optimum process efficiency.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 4; art. no. 150477
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of the foaming performance of ammonium dibutyl dithiophosphate on the flotation of slime-containing copper sulfide ore
    Autorzy:
    Deng, Rongdong
    Duan, Wenting
    Wang, Yi
    Hu, Yuan
    Powiązania:
    https://bibliotekanauki.pl/articles/2175431.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    ammonium dibutyl dithiophosphate
    terpenic oil
    foaming property
    froth flotation
    slime
    Opis:
    The use of ammonium dibutyl dithiophosphate (ADD) as a collector in the flotation of slimecontaining copper sulfide ore typically produces a sticky froth, which results in poor flotation. The mechanism and effects of copper sulfide ore flotation in synergistic systems comprising ADD and terpenic oil reagents have been systematically investigated to solve this problem. A high ratio of ADD to terpenic oil is not conducive to the flotation of fine-grained copper sulfide ores; however, adjusting this ratio may improve floatation by reducing the effect of the slime. Lowering the ratio from 5:1 to 1:1 increased the copper grade from 17.7% to 20.8%, while the recovery was largely unchanged. Notably, adjusting this ratio also reduced the cost of the flotation reagent. To study the mechanism by which the ADD–to–terpenic oil ratio affects the foam performance, the froth stability tests of the gas–liquid twophase and gas–liquid–solid three-phase systems were performed. Reducing the proportion of ADD reduced the froth water content and weakened the ability of the froth to collect gangue by adsorbtion with copper ions; this reduced gangue entrainment and maximized recovery and product quality.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 153492
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Role of calcium and magnesium cations in the interactions between kaolinite and chalcopyrite in seawater
    Autorzy:
    Uribe, L.
    Gutierrez, L.
    Laskowski, J. S.
    Castro, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/109955.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    froth flotation
    chalcopyrite
    chalcopyrite flotation
    clay minerals
    kaolinite
    seawater
    slime coating
    Opis:
    A number of flotation plants around the world have increased the use of seawater due to limited sources of fresh water. The aim of this research work is to study the role that Mg2+ and Ca2+ ions play in the interactions between kaolinite and chalcopyrite in seawater. In order to achieve this objective, the effect of kaolinite on flotation of chalcopyrite is studied over the pH range from 8 to 11, when flotation is carried out in seawater and in a 0.01M NaCl solution. The influence of calcium, magnesium, sodium, and potassium ions on the extent of depression by kaolinite is evaluated. The micro-flotation results indicate that chalcopyrite is depressed by kaolinite in both 0.01 NaCl solution and seawater. In the 0.01 NaCl solution, the depressing effect of kaolinite decreases as the pH increases from 8 to 11. However, the results obtained using seawater show that the depressing effect of kaolinite is similar to what is observed in a 0.01 NaCl solution only at pH values below 9, but above this pH kaolinite significantly affects the recovery of chalcopyrite. The results from experiments with using solutions containing individual cations show that the depressing action of kaolinite in the presence of Mg2+ and Ca2+ is more obvious at pH values of 9 and 10, respectively, which correlates with the pH values at which the first hydroxy-complexes of these divalent cations start forming. This seems to indicate that depressing effect of kaolinite on chalcopyrite in seawater may be related to formation of hydrolyzed species of calcium and magnesium. These species can induce heterocoagulation between kaolinite and chalcopyrite. The trends observed in the micro-flotation experiments are in good agreement with the results of the induction time measurements and slime coating tests.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2017, 53, 2; 737-749
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Sodium Hexametaphosphate on Natural Flotation Kinetics of Talc Ore
    Wpływ heksametafosforanu sodu na kinetykę flotacji naturalnej rudy talkowej
    Autorzy:
    Brezani, I.
    Sisol, M.
    Marcin, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/318773.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    flotacja pianowa
    flotowalność naturalna
    depresor
    kinetyka flotacji
    ruda talku
    froth flotation
    natural floatability
    flotation depressor
    flotation kinetics
    talc ore
    Opis:
    Ground high-grade ore with the d80 of 150 μm was subjected to a series of batch laboratory flotation tests, aimed at determining the natural flotation kinetics of talc mineral, using Methyl isobutyl carbinol (MIBC) frother as the only reagent. Classical first-order flotation model was used and the flotation kinetics are interpreted using the ultimate recovery (R∞) and flotation rate constant (k). Results are then compared with the kinetics of flotation in the presence of different dosages of the frother, Sodium hexametaphosphate (SHMP) and a mixture of SHMP and Soluble starch (SS) in various ratios. The design of experiment (DoE), evaluated using the Analysis of variance (ANOVA) test for multiple factors was used to calculate the statistical significance of the individual factors on the outcomes of the flotation tests – yield of the froth product, talc concentrate grade, talc recovery and flotation kinetics of both talc and gangue minerals. The effect of SHMP on the flotation kinetics of talc and gangue minerals in terms of affecting the R∞ and k parameters is here discussed in greater detail. Although both SHMP and SHMP/SS mixture was found to improve the overall grade of the talc concentrate, this was achieved at the expense of significantly lower recoveries of the valuable mineral.
    Zmielona wysokowartościowa ruda o ziarnie podziałowym d80 = 150 μm została poddana serii laboratoryjnych prób flotacji, mających na celu określenie kinetyki flotacji naturalnej minerałów talku, w obec-ności jedynego środka zbierającego metylo-izobutylokarbinol (MIBC). Zastosowano klasyczny model flotacji pierwszego rzędu gdzie kinetykę flotacji interpretuje się za pomocą współczynnika uzysku R∞ i stałej szybkości flotacji (k). Wyniki porównano z kinetyką flotacji w obecności różnych dawek spieniacza, heksametafosforanu sodu (SHMP) i mieszaniny SHMP i rozpuszczalnej skrobi (SS) w różnych proporcjach. Plan eksperymentu (DoE), oceniono za pomocą analizy wariancji (ANOVA) dla wielu czynników użyto do obliczenia istotności statystycznej parametrów flotacji - wydajność produktu pianowego, zawartość talku, uzysk talku i kinetyka flotacji zarówno minerałów talku, jak i skały płonnej. Wpływ SHMP na kinetykę flotacji minerałów talku i skały płonnej na parametr R∞ i k są omówione bardziej szczegółowo. Chociaż stwierdzono, że dla obu mieszanek SHMP i SHMP / SS poprawie uległ stopień koncentracji talku odbyło się to jednak kosztem znacząco niższych wartości uzysku cennego minerału.
    Źródło:
    Inżynieria Mineralna; 2018, R. 19, nr 1, 1; 125-130
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nowe kierunki badań oraz rozwoju odczynników do flotacji węgla oraz minerałów niepolarnych
    New directions in the research and development of reagents for flotation of coal and non-polar minerals
    Autorzy:
    Vidlar, J.
    Pasiowiec, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/318725.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    flotacja mułów węglowych
    flotacja pianowa
    odczynniki flotacyjne
    odczynniki flotacyjne pochodzenia biologicznego
    flotation of coal sludge
    froth flotation
    flotation reagent
    flotation reagent of biological origin
    Opis:
    Podczas wydobycia oraz przeróbki mechanicznej węgla kamiennego oraz szeregu materiałów naturalnie hydrofobowych (grafit, siarka samorodna, talk, molibden, mika) powstaje i jest podawana przeróbce mechanicznej duża ilość drobnych ziaren surowca użytecznego (tzw. mułów), które występują w postaci zagęszczonych zawiesin wodnych lub zawiesin rozcieńczonych, traktowanych jako zanieczyszczone wody ściekowe. Najbardziej skuteczną metodą pozyskiwania użytecznych składników mineralnych z takich zawiesin wodnych (tzw. mułów flotacyjnych) jest flotacja pianowa. W ostatnich latach flotacja wykorzystywana jest coraz częściej jako metoda oczyszczania ścieków przemysłowych, zanieczyszczonych substancjami nieorganicznymi i organicznymi oraz jako metoda zagęszczania trudno sedymentujących mułów. W laboratoriach badawczych Wydziału Górnictwa i Geologii Vysokiej Skoly Banskiej w Ostrawie (HGF VŠB-TUO) przeprowadzono badania rozwojowe, których celem było uzyskanie pełnowartościowych odczynników flotacyjnych zastępując składniki ropopochodne składnikami pochodzenia biologicznego. Nowym perspektywicznym kierunkiem w zakresie opracowywania receptury odczynników flotacyjnych do flotacji mułów węglowych (uwzględniając skokowy rozwój branży produkcji biopaliw silnikowych-MEŘO) okazały się być badania oraz wdrożenia odczynników flotacyjnych na bazie komponentów odpadowych i produktów pośrednich tych biotechnologii. Skład nowo wytwarzanych odczynników flotacyjnych opiera się na doborze dostępnych składników pochodzenia biologicznego, mianowicie składników hydrofobowych i składników spieniających. Próby przemysłowe potwierdziły żądaną skuteczność technologiczną a zwłaszcza efektywność ekonomiczną zastąpienia stosowanych do tej pory odczynników flotacyjnych petrochemicznych nowo wytworzonymi odczynnikami bio.
    During mining and mechanical processing of hard coal and some naturally hydrophobic materials (graphite, nugget sulphur, talcum, molybdenum, mica), a great quantity of small molecules of sludge of the extracted usable raw material is created and mechanically processed afterwards. The sludge appear as concentrated water slurry or diluted suspensions defined as polluted drain waters. The most efficient method to separate usable mineral components from water slurry (so-called "flotation sludge") is froth flotation. Recently the flotation is still more often used as a method of treatment of industrial waste, polluted with organic and non - organic substances, and as a concentration method for sludge of difficult sedimentation. In the research laboratories HGF VSB-TUO development researches has been done in order to find components of biological origin that are of full value and can replace currently used petrochemical components of flotation reagents. The research and implementations of flotation reagents based on waste components and indirect products of these technologies proved to be a new perspective direction in the area of defining flotation reagents for the flotation of coal sludge (taking into consideration an accelerated development of the branch of engine bio fuels production - MERO). The composition of new flotation reagents is based on the preferences of available components of biological origin, i.e. hydrophobic and frothing ones. The exploitation tests proved the required technological efficiency and, in particular, the economic benefit obtained by substituting the petrochemical flotation reagents used until now with new created reagents.
    Źródło:
    Inżynieria Mineralna; 2009, R. 10, nr 2, 2; 1-7
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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