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Wyświetlanie 1-15 z 38
Tytuł:
Comparing the efficiency of evacuated tube and flat-plate solar collectors in real installation conditions
Autorzy:
Jurczak, Marlena Anna
Skotnicka-Siepsiak, Aldona
Powiązania:
https://bibliotekanauki.pl/articles/2065635.pdf
Data publikacji:
2020
Wydawca:
Politechnika Częstochowska
Tematy:
flat plate solar collectors
evacuated tube collectors
efficiency of solar collectors
płaskie kolektory słoneczne
kolektory rurowe
sprawność kolektorów słonecznych
Opis:
The subject of the work is an analysis of two types of solar collectors: flat-plate and evacuated tube collectors in the same, natural working conditions during the period from 1st May 2017 to 30th September 2017. The scope of work includes a descriptive presentation of a measuring setup, located on the roof of the building of the Construction University of Warmia and Mazury in Olsztyn, and also the research methodology, as well as an analysis of the results and conclusions obtained. The measurements allow a comparison of the efficiency of the flat-plate and evacuated tube collectors by calculating heat yields, based on the following variants: average hourly irradiation, outdoor air temperature, temperature of the medium supplying the collectors and temperature of the returning medium. An analysis of the heat yield was made in relations to the individual absorber surface, to determine which of the tested collectors showed higher efficiency under real operating conditions during the spring-summer period.
Źródło:
Budownictwo o Zoptymalizowanym Potencjale Energetycznym; 2020, 9, 2; 31--38
2299-8535
2544-963X
Pojawia się w:
Budownictwo o Zoptymalizowanym Potencjale Energetycznym
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Micro-FTIR analysis to study the change in surface chemistry after addition of collectors and their effect on coal hydrophobicity
Autorzy:
Wang, W.
Kumar, A.
Holuszko, M. E.
Mastalerz, M.
Powiązania:
https://bibliotekanauki.pl/articles/110471.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
hydrophobicity
collectors
micro-FTIR
Opis:
In this study, the micro-FTIR analysis was used to investigate in-situ surface properties of coal, and was directly correlated to coal hydrophobicity, as measured by the contact angle before and after the addition of collectors, to understand their suitability for flotation. Three different collectors, diesel, pine needle oil and dodecyl trimethyl ammonium bromide (DTAB) were tested. The micro-FTIR technique provided a semi-quantitative analysis of functional groups present on the coal surface exactly where the contact angle was measured and provided a visualization of collector adsorption on specific areas of coal and associated changes in coal surface properties. This analysis could lead to a smarter way of using process design in terms of reagent selection for coal flotation to obtain a product of desired petrographic composition, which would especially be useful for coking coals. This study presents a work in progress for developing a procedure for a quick pre-selection of collectors for coal flotation based on coal surface properties.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 4; 1292-1302
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of anionic, cationic and amphoteric collectors used in pyrite flotation
Autorzy:
Bulut, Gülay
Sirkeci, A. A.
Arı, Beril
Powiązania:
https://bibliotekanauki.pl/articles/1446764.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
flotation
pyrite
amine
collectors
xanthate
Opis:
In this study, flotation tests were conducted with purified pyrite and ore samples. The collectors employed were anionic and cationic type such as potassium ethlyl-amyl xanthate, Tomamine M73 and Resanol Bal. According to the flotation tests, it was found that pyrite floated at low pH and depressed at high pH values with xanthates. On the other hand, in the case of cationic collectors which are Tomamine M73 (alkyl ether amine, an amphoteric surfactant) and Resanol Bal (N-3-tridecyloxy propyl 1-3 diamine, branched acetate) pyrite floated at high pH values. It was shown that amine type collectors could be efficient to selectively float pyrite from chalcopyrite at alkali pH ranges in the case of ore samples.
Źródło:
Physicochemical Problems of Mineral Processing; 2021, 57, 5; 15-22
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tetrahydrofurfuryl-functionalized polystyrene nanoparticles as collectors for low rank coal flotation
Autorzy:
An, Maoyan
Liao, Yinfei
Cao, Yijun
Zhao, Yifan
Qiu, Yuliang
Powiązania:
https://bibliotekanauki.pl/articles/109357.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
nanoparticles
low rank coal
flotation
collectors
Opis:
In this paper, tetrahydrofurfuryl-functionalized polystyrene nanoparticles (TFPNs) were evaluated as collectors in low-rank coal flotation. A series of TFPNs were prepared by immobilizing tetrahydrofurfuryl groups onto the surface of polystyrene nanoparticles (PNs), and further characterized in terms of their size, shape, surface charge and surface functionalization group concentration (SFGC). The coal flotation performance using TFPNs was compared to that using PNs and diesel oil (DO). The interaction mechanisms between TFPNs and low-rank coal were also discussed. The results show that TFPNs gave higher recovery than that given by PNs and DO. Smaller TFPNs were more effective flotation collectors. The recovery of TFPNs increased firstly and then decreased with SFGC. TFPNs can specifically deposit onto the low-rank coal particles with the hydrogen bonding function between tetrahydrofurfuryl groups and oxygen-containing functional groups, and promote low-rank coal flotation by increasing the hydrophobicity and roughness of coal particle surface with the adsorbed TFPNs. It was demonstrated that TFPNs introduced a new class of collectors for low rank coal flotation.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 2; 516-527
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of energy costs in a single family house with gas boiler for a heating system and solar collectors in a domestic hot water system
Autorzy:
Wądołowska, Bernadetta
Krawczyk, Dorota Anna
Powiązania:
https://bibliotekanauki.pl/chapters/31015901.pdf
Data publikacji:
2020
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
renewable energy sources
solar collectors
DHW
heating
Opis:
Solar collectors are commonly used in domestic hot water (DHW) systems in different types of buildings. In this paper we conducted the analysis for a single family house located in two countries: Poland (Warsaw) and Spain (Madrid). Various factors like national rules, climatic conditions, investment costs or fuel and electricity prices were taken into consideration. We took into account flat-plate and vacuum pipe collectors to select the best solution. The results show that the use of solar collectors in Poland and Spain is economically justified. Moreover we analyzed heat loses and annual operating costs of the heating installation for both buildings and they were found to be at a similar level, due to high fuel prices in Spain.
Źródło:
Innovations – Sustainability – Modernity – Openness. Energy; 9-17
9788366391291
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multi-stage flotation of colored impurities from albite ore in the presence of some cationic and anionic collectors
Autorzy:
Kilinc-Aksay, E.
Powiązania:
https://bibliotekanauki.pl/articles/109851.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
albite
colored impurities
collectors
multi-stage flotation
Opis:
Mica and heavy minerals containing iron oxides and titanium oxides such as rutile and sphene are floated using cationic and anionic collectors, respectively. In this study, separation of colored impurities including mica and heavy minerals from the albite ore obtained from the Aydin region in Turkey was investigated by multi-stage flotation. The effects of the new cationic and various anionic collectors and their dosages in either acidic or natural circuits were investigated to upgrade the albite ore. In the case of the flotation stage of mica minerals, the results obtained from this study showed that the stearylamine collector (Flotigam-S) gave the best performance and an albite concentrate with 7.58% Na2O grade was produced with 81.40% Na2O recovery at 400 g/Mg Flotigam-S under the acidic condition at pH 3. Additionally, in the heavy minerals flotation stage, the use of Na-oleate in the natural circuit (pH 6) was the most effective for removal of iron and titanium oxides, and an albite concentrate with 0.042% Fe2O3 and 0.061% TiO2 grades was produced with 91.89% Fe2O3 and 88.56 %TiO2 recoveries, respectively, with the use of 900 g/Mg Na-oleate. Under the optimum conditions, the colored impurities containing mica minerals, iron oxides and particularly sphene as well as rutile could be effectively removed from the albite ore in the presence of Flotigam-S and Na-oleate collectors by multi-stage flotation.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 2; 220-227
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of control system for central heating boiler
Autorzy:
Huścio, Tomasz
Powiązania:
https://bibliotekanauki.pl/chapters/32304181.pdf
Data publikacji:
2021
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
solar thermal collectors
biomass boiler
heat pump
Opis:
Air pollution is the most harmful to health and the environment out of all types of pollution. Boiler designs with modern burners, fired by biomass, should be characterized by high energy efficiency and compliance with environmental protection standards. The efficiency of the combustion process is determined by the amount of heat obtained. The quality of the combustion process can be evaluated by the efficiency of the fuel processing equipment. The higher the efficiency, the more energy is obtained from combustion of a unit of fuel. One should also remember that, for the purpose of minimizing environmental hazards, besides modern boiler and burner designs, selection of fuel of proper quality and correct selection of flue gas discharge installations, the designing and implementation of an appropriate control system is also necessary. Inadequate control system solutions result in elevated emissions of harmful substances into the atmosphere and reduces the efficiency of the combustion process, which increases operating costs as a result.
Źródło:
Methods and tools in CAD – selected issues; 145-155
9788366391871
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
QSAR study of amine collectors for iron ore reverse flotation
Autorzy:
Wang, Benying
Xu, Xinyang
Duan, Hao
Wang, Xinyang
Powiązania:
https://bibliotekanauki.pl/articles/110929.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
QSAR
separation efficiency
reverse flotation
amine collectors
Opis:
In order to reveal the relationship between flotation behaviors of collectors and their structures, quantitative structure–activity relationship (QSAR) study about separation efficiency of quartz from hematite using amine collectors was performed. The genetic function approximation (GFA) algorithm was applied to generate the correlation models and model with acceptable R2 and Rcv2 (cross validated R-squared) correlation coefficients (R2=0.9666, Rcv2=0.9201) was developed. The model revealed that the Lowest Unoccupied Molecular Orbital (LUMO) energy of the molecule, the charge of nitrogen and the electronegativity of polar group were the major factors that affected the separation efficiency of collectors. The higher nitrogen charge, the larger electronegativity of polar group and the more positive of LUMO energy of amine collectors were, the higher separation efficiency would be.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 5; 1059-1069
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Change in dust collection efficiency of liquid collectors in conditions of dedusting liquid recirculation
Autorzy:
Krawczyk, J.
Powiązania:
https://bibliotekanauki.pl/articles/778565.pdf
Data publikacji:
2017
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
dust collectors
dust removal efficiency
wet scrubbers
Opis:
The high efficiency of industrial wet scrubbers is the result of a simultaneous formation of dust particle collectors. Collectors can be understood as droplets of atomised liquid, bubbles formed in the conditions of intensive barbotage, liquid surface and wet surfaces. All collectors are formed during the operation of a circulating unit. The efficiency of dust collection process also depends on the ability of dust particles to be absorbed by collectors. The study provides an experimental analysis of the effect of the increasing concentration of a dust collection liquid in the conditions of full liquid recirculation on the efficiency of dust collection process in the examined types of collectors.
Źródło:
Polish Journal of Chemical Technology; 2017, 19, 4; 1-7
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evolution of ideas towards the implementation of nanoparticles as flotation reagents
Autorzy:
Legawiec, Krzysztof Jan
Polowczyk, Izabela
Powiązania:
https://bibliotekanauki.pl/articles/1450540.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
nanoparticles
nanocelluloses
polystyrene
nano-collectors
green flotation chemicals
Opis:
The paper discusses an idea of nanoparticles application to the flotation process. Due to the growing awareness of the environmental impact of industry and legal restrictions, the directions of research on new chemicals used in mineral processing, as well as in the other branches of industry are changing. The flotation reagents of the future should be, or are expected to be, readily biodegradable, but also their products should be harmless to the environment. A review of the works presented here presents an overview of the state-of-the-art application of nanostructures from early reported polystyrene nanoparticles to the most promising cellulose nanostructures which can be successfully adapted to the desired amphiphilicity parameters through simple functionalization. Limitations on the use of such nano-sized entities related to control aggregation in the flotation process and the ability to adsorb at interphase boundaries are also presented. Overall, nanoparticles can become universal flotation collectors and also an alternative to conventionally used hydrocarbon-based reagents.
Źródło:
Physicochemical Problems of Mineral Processing; 2020, 56, 6; 280-289
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Flotation and molecular dynamics simulation of muscovite with mixed anionic/cationic collectors
Autorzy:
Bai, Yang
Li, Caixia
An, Hongyun
Wang, Guoliang
Zhao, Xin
Zhang, Jinqi
Powiązania:
https://bibliotekanauki.pl/articles/110125.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
muscovite
mixed anionic/cationic collectors
flotation
molecular dynamics simulation
Opis:
In this study, three kinds of anionic collectors (sodium oleate (NaOl), sodium dodecyl sulfonate (SDS) and naphthenic acid (NA)) were used in combination with dodecylamine (DDA) to investigate the flotation behavior of muscovite under the action of different mixed anionic/cationic collectors, and their mechanisms for adsorption on the muscovite (001) Surface were clarified using molecular dynamics simulations. The flotation results indicated that different mixed anionic/cationic collectors could improve the recovery of muscovite to varying degrees, but the optimum molar ratio of anionic collectors to DDA and the optimum mixed collector dosage were different. Molecular dynamics simulations showed that the mixed anionic/cationic collectors could significantly increase the hydrophobicity of the muscovite, as evidenced by the decrease in the calculated water molecule density on the muscovite surface and the diffusion coefficient of water molecules at the solid/liquid interface. The interaction between the amino group and the polar group of anionic collectors reduced the electrostatic repulsion between DDA cations and theoretically increased the adsorption capacity of the mixed anionic/cationic collectors on the muscovite surface. Moreover, DDA/NA and DDA/NaOl could improve the calculated carbon atom density on the muscovite surface, which enhanced the hydrophobic association between nonpolar carbon chains, thus further achieving an enhanced flotation performance.
Źródło:
Physicochemical Problems of Mineral Processing; 2020, 56, 2; 313-324
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Degradation mechanism study of amine collectors in Fenton process by quantitative structure-activity relationship analysis
Autorzy:
Wang, X.
Liu, W.
Duan, H.
Powiązania:
https://bibliotekanauki.pl/articles/110363.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
amine collectors
Fenton process
QSAR
degradation mechanism
quantum chemistry
Opis:
In this study, advanced oxidation processes (AOPs), Fenton process, was applied to degrade ten amine collectors. The experimental results indicated that most of the tested amines could be removed rapidly and effectively at pH=4, while the degradation of quaternary ammonium compounds was less than others. To research the Fenton oxidation process, the degradation-rate constants of amine collectors were calculated by the pseudo-second order kinetic model, then which was used as the dependent variable to establish a quantitative structure activity relationship (QSAR) model. Meanwhile, 16 molecular structure descriptors and quantum mechanical parameters for amine collectors were simulated and analyzed by using Materials Studio software. The optimum QSAR model was established based on the partial least squares regression (PLS) method and confirmed by the statistics analysis. The model revealed that hydrogen bond acceptor (HBA) and the maximum values of electrophilic attack in C atom sites (f(-)c) were the major effect factors for the degradation-rate constants of amine collector.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 3; 713-721
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of mixed collectors on quartz-feldspar by fluorine-free flotation separation and their interaction mechanism : a review
Autorzy:
Li, Peiyue
Ren, Zijie
Xie, Enjun
Duan, Shutong
Gao, Huimin
Wu, Jianxin
He, Yuhao
Powiązania:
https://bibliotekanauki.pl/articles/1446562.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
quartz
feldspar
crystal structure
flotation
mixed collectors
environmentally friendly
Opis:
Quartz and feldspar are usually exist in symbiosis in nature, and they are difficult to be separated effectively by conventional physical methods owing to their similarities in crystal structures and surface characteristics. Flotation is the most resultful method, and especially, flotation with hydrofluoric acid (HF) is the most efficient way. Because HF may cause serious environmental and health problems, the effective and environmentally friendly separation of quartz and feldspar remains a formidable challenge. The crystal structure, surface broken bonds, surface energy, and solid–liquid interface properties of quartz and feldspar are investigated in this paper. In particular, some types of mixed cationic/anion collectors and their interaction mechanism on the quartz and feldspar surfaces with acidic, alkaline, and neutral media in the absence of fluorine are discussed, and the grade and scheme of quartz and feldspar for the practical application are illustrated. This review proposes concrete research approaches and provides perspectives for the advanced processing of quartz and feldspar in an environmentally friendly and economical way.
Źródło:
Physicochemical Problems of Mineral Processing; 2021, 57, 4; 139-156
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:
Exploration on flotation behavior of galena in seawater and related mechanism
Autorzy:
Song, Ningbo
Sun, Chuanyao
Yin, Wanzhong
Yao, Jin
Yang, Bin
Powiązania:
https://bibliotekanauki.pl/articles/2146915.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
high-sulfur magnetite
pyrrhotite flotation
magnetic separation
mixed collectors
Opis:
The utilization of seawater in mineral flotation is the future development trend because of the shortage of fresh water resources. However, at present, the flotation behavior and mechanism of galena in seawater are not clear. Therefore, this paper comprehensively carried out the effect mechanism of seawater on the flotation of galena. Micro-flotation results illustrated that the recovery of galena was higher in deionized water than that in 5×10-2 mol/L MgCl2 solution, 1×10-2 mol/L CaCl2 solution and seawater. Contact angle determination and Zeta potential distribution measurements showed that hydrophilic substances adsorbed on the surface of galena under alkaline conditions. X-ray photoelectron spectroscopy (XPS) analysis further indicated that these substances were hydroxides precipitates, carbonate precipitates and hydroxyl complexes formed by divalent magnesium and calcium ions, which prevented the adsorption of collector on mineral surface. As a result, the galena recovery declined in 5×10-2 mol/L MgCl2 solution, 1×10-2 mol/L CaCl2 solution and seawater.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 4; art. no. 151524
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
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