Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "Potential" wg kryterium: Temat

  Lista filtrów
Wyrównaj
Wyświetlanie 1-15 z 57
Tytuł:
Pomiar stabilności glebowych układów koloidalnych w glebach
Soil stability measurement of soil colloidal systems
Autorzy:
Woźniczka, P.
Chodak, T.
Powiązania:
https://bibliotekanauki.pl/articles/239255.pdf
Data publikacji:
2006
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
koloid glebowy
potencjał sedymentacji
potencjał zeta
dyspersja
soil colloid
sedimentation potential
zeta potential
dispersion
Opis:
W obiegu pierwiastków w powierzchniowej warstwie litosfery, w tym szczególnie w środowisku glebowym, istotną rolę odgrywają zjawiska koagulacji i peptyzacji koloidów glebowych. Zwłaszcza w warunkach klimatu umiarkowanie wilgotnego przy niewłaściwym nawożeniu gleb i ich użytkowaniu następuje wzrost stabilności glebowych układów dyspersyjnych, a tym samym rozpad ich struktury i w konsekwencji przemieszczenie koloidów z górnych do dolnych części profilu glebowego lub dalej do wód gruntowych. Zdyspergowane koloidy glebowe, ulegając przemieszczeniu przenoszą zasorbowane makro i mikroelementy, w tym szczególnie niebezpieczny dla środowiska fosfor. Sam fosfor może również wpływać na zwiększenie stopnia dyspersji koloidów glebowych. W związku z tym w niniejszej pracy zdecydowano się podjąć próbę opracowania systemu pomiaru stanu dyspersji glebowych układów koloidalnych. W tym celu opracowano i wykonano cyfrowy układ do pomiaru potencjału sedymentacyjnego. Koncepcja pomiaru opiera się na zmodyfikowanej metodzie potencjału sedymentacji, wykorzystując zjawisko powstawania różnic potencjałów elektrycznych w zawiesinie glebowej podczas sedymentacji cząstek fazy stałej (Efekt Dorna). Wstępne wyniki pomiarów wskazują na przydatność tego rodzaju urządzenia. Na ich podstawie można w sposób pośredni określić i porównać stabilność glebowych układów dyspersyjnych gleby o zbliżonych właściwościach fizyko-chemicznych.
Soil colloidal coagulation and peptization phenomenon significantly affects elements cycle in the lithosphere surface layer. If soil is not properly fertilized and exploited, especially in temperate humid climate conditions, stability of its dispersal colloidal systems increases, and this results in displacement of colloids from upper to bottom parts of soil profile, or deeper - into ground water. When displacing, dispersed soil collides transport absorbed macro- and microelements including phosphorus, which is especially dangerous for environment. Phosphorus, itself, may also affect enhancement of soil colloids dispersion. Taking into account the above reasons we have decided to develop a control system for assessment of soil colloidal system dispersion. Within our research tasks we have worked out a digital system for sedimentation potential control. Measurement conception was based on the modified method of sedimentation potential control. In this method, electric potential difference in soil suspension during sedimentation process of solid phase particles (Dorn Effect). First measurement results proved practical usability of such model equipment. It enables definition and comparison of soil colloidal dispersion systems of similar physical and chemical parameters.
Źródło:
Problemy Inżynierii Rolniczej; 2006, R. 14, nr 2, 2; 61-70
1231-0093
Pojawia się w:
Problemy Inżynierii Rolniczej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability of colloidal systems - a review of the stability measurements methods
Autorzy:
Matusiak, Jakub
Grządka, Elżbieta
Powiązania:
https://bibliotekanauki.pl/articles/763954.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
stability
colloids
zeta potential
turbidimetry
spectroscopy
Opis:
The stability of colloidal systems is very important in numerous already existing and new formulations. In most cases if such systems are not characterized by an appropriate stability they can not find any useful applications. The opposite process to the stabilization is the flocculation. Generally, it is undesirable. However, in a few cases the flocculation is very useful, for example in  the wastewater treatment. That is why the methods used to determine stabilizing-flocculating properties of the colloidal systems are of significant importance.The paper describes types of stability and flocculation as well as the factors influencing those processes, e.g. the addition of polymers or surfactants. The methods presented in this paper are UV-VIS spectrophotometry,  turbidimetry, zeta potential and density measurements.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2017, 72, 1
2083-358X
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of zeta potential on the sedimentation behavior of natural stone processing effluent
Autorzy:
Kurama, H.
Karaguzel, C.
Powiązania:
https://bibliotekanauki.pl/articles/109985.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
travertine
environment
stone industry
zeta potential
Opis:
One of the main problems for the natural stone industry is treatment of huge amount of waste sludge resulting from the cutting and polishing of them to produce slabs or tiles. The effective treatment of this sludge is very important for reducing of the sludge volume and overall operating costs. Previous studies showed that settling rate and water clarity of the supernatant solution can be increased by flocculation process. In this study, detailed electrokinetic studies were performed on the travertine samples received as natural and slurry form. The natural form of the sample was supplied from a travertine quarry while the slurry was taken from the cutting and polishing process wastewater collector pool of the processing plant. The electrokinetic measurements were conducted to find out the effect of suspension pH and the solid content on the surface potential of solid particles show that zeta potential (ζ) of travertine is positive at pH 9.76 over the all solid contents studied in this work. However, ζ of the particles become negative at lower pH values for 1% solid weight content. In contrast, for travertine slurry (6.73% solid weight), different potential variations were determined. The particles were negatively charged between pH 6 and 8. The results highlighted the effect of dissolved specific ions in the waste slurry and sensitivity of ζ to the ionic strength of the solution. The ζ measurements for a raw travertine sample, performed with different amounts of NaCl additions into the solutions, confirmed the above findings. An addition of low amounts of NaCl decreases ζ of the solid surface. Finally, the ζ measurements in the presence of polymer concentration of 0.001% to 0.1 % (wt/vol) clearly indicated that the flocculant molecules are adsorbed extensively on the travertine particles, and increase the surface potential of the particles with increasing reagent concentration.
Źródło:
Physicochemical Problems of Mineral Processing; 2013, 49, 2; 575-586
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and characterization of mesoporous silica: laboratory exercises for students
Autorzy:
Kosmulski, Marek
Mączka, Edward
Powiązania:
https://bibliotekanauki.pl/articles/763958.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
SBA-15
specific surface area
zeta potential
Opis:
Synthesis and characterization of SBA-15 were proposed as a laboratory course: linked series of exercises for graduate students. The standard preparation method was modified to fit a typical schedule of students’ classes, that is, 3-hours units every second week. The properties of materials obtained by different students’ groups were compared with the properties of materials obtained by means of a standard method.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2016, 71, 2
2083-358X
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relationship between the rheological parameters and zeta potential of bentonites
Autorzy:
Kowalczyk, D.
Wach, M.
Plewik, A.
Wysocki, S.
Powiązania:
https://bibliotekanauki.pl/articles/298880.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
electrokinetic phenomena
zeta potential
drilling fluids
bentonite
Opis:
The paper presents an estimation of bentonites quality using electrokinetic phenomena occurring in dispersed clay systems. The idea behind the work is to demonstrate the relationship between the rheological parameters of the tested materials, and their zeta potential and consequently determine the suitability of these criteria for preparing drilling fluids.
Źródło:
AGH Drilling, Oil, Gas; 2016, 33, 4; 663-669
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selective dispersion-flocculation and flotation studies on a siliceous copper ore
Autorzy:
Mweene, L.
Subramanian, S.
Powiązania:
https://bibliotekanauki.pl/articles/109546.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
flocculation
adsorption
zeta potential
dispersion
chalcopyrite flotation
Opis:
A low-grade copper ore from Mpanda Mineral Field (MMF), Tanzania containing 0.90% Cu, 10.40% Fe and 58.3% SiO2 was subjected to beneficiation adopting selective dispersion, flocculation and flotation techniques. Based on the mineralogical characterization of the sample chalcopyrite, pyrite and quartz were identified as the major minerals. The isoelectric point of MMF ore was observed to be at pH 2.7, signifying that the ore was highly siliceous. The addition of sodium trisilicate and xanthan gum shifted the zeta potential of ore to more electronegative values. Adsorption of xanthan gum on chalcopyrite and silica indicated that the maximum adsorption was at pH 2.3 for chalcopyrite and the adsorption isotherm exhibited L2 type of the Giles classification. On the contrary, no adsorption of xanthan gum on silica was observed. The ground ore was selectively dispersed and flocculated at pH 9.7 using 30 ppm of sodium trisilicate and 30 ppm of xanthan gum. The grade of CuFeS2 was improved to 19.8% after 3 desliming stages. Flotation of the flocculated portion was carried out at pH 10.30 using 30 g/t of potassium amyl xanthate and potassium ethyl xanthate (1:1) , 40 g/t of Na2S as a sulphidising agent and methyl iso-butyl carbinol (MIBC) as a frother yielding a rougher concentrate with silica and chalcopyrite grades of 8.4% and 23.5% respectively with corresponding recoveries of 4.8% and 92.8% respectively. Additionally, rougher concentrate was subjected to cleaner flotation yielding silica and chalcopyrite grades of 1.8% and 29.2 % respectively and with recoveries of 1.2% and 89.1% respectively.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 4; 1282-1291
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental study on electrokinetic of kaolinite particles in aqueous suspensions
Autorzy:
Min, F.
Zhao, Q.
Liu, L.
Powiązania:
https://bibliotekanauki.pl/articles/110918.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
kaolinite
zeta potential
pH
immersion time
electrophoresis
Opis:
Influence of aqueous phase properties and process parameters on kaolinite particle zeta potential was quantified by electrophoresis experiments. The results indicated that pH strongly altered the zeta potential of kaolinite and it decreases at the beginning and then increases in the range of pH = 2–13. The activity of different cations changes the zeta potential and has the following tendency of Al3+ > Ca2+ > Mg2+ > Na+ and the zeta potential increases due to heterocoagulation of different mineral particles in suspension. It was found that the zeta potential of kaolinite particles increases after the suspension was stirred and decreases at the beginning, and then increases with soaking time. The FTIR results showed that the zeta potential takes into account ion adsorption and the change of Si–O, Al–O and Al–OH groups on the surface of the kaolinite particles.
Źródło:
Physicochemical Problems of Mineral Processing; 2013, 49, 2; 659-672
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study of selected properties of rhenium sulphide dispersion
Autorzy:
Pawlak, D. W.
Parus, J. L.
Skwarek, E.
Janusz, W.
Powiązania:
https://bibliotekanauki.pl/articles/951830.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
rhenium sulphide
particle size distribution
zeta potential
Opis:
Due to potential application of rhenium sulphide in medicine and industry, this study is focused on the properties of synthetic and commercial rhenium sulphide. The main reaction of rhenium sulphide preparation involves potassium perrhenate and sodium thiosulphate in the acidic environment giving a mixture of rhenium sulphide and sulphur. The next step is removing sulphur by its dissolution in ether. Stabilization by Povidone K-25 is needed to obtain rhenium sulphide dispersed with the grain size of 0.5–4 m. The extrapolated value of pHiep for synthesised rhenium sulphide is 2.3 whereas for commercial samples this value is lower than 2. For synthetic sample a dependence of zeta potential on the carrier electrolyte concentration is found. It is larger than that for the commercial sample, probably due to surface oxidation during synthesis or purification.
Źródło:
Physicochemical Problems of Mineral Processing; 2014, 50, 1; 387-397
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of oxidation roasting on ilmenite flotation
Autorzy:
Mehdilo, A.
Irannajad, M.
Rezai, B.
Powiązania:
https://bibliotekanauki.pl/articles/109387.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
flotation
ilmenite
oxidation roasting
surface chemistry
zeta potential
Opis:
In this study, the oxidation roasting was used to modify the ilmenite chemistry to improve the collector adsorption and ilmenite flotation behavior. The results indicated that the increase of the roasting temperature up to 600 ºC increased the ilmenite flotation recovery. The maximum collector adsorption density occurred on ilmenite roasted at 600 °C which resulted in the increase of ilmenite flotation recovery from 73.5% to 91% at pH 6.3. This improvement was attributed to a greater conversion of Fe2+ to Fe3+ ions and significant decrease in the zeta potential of ilmenite. At the roasting temperatures of 750 °C and 950 °C, ilmenite was converted to rutile and some trivalent iron containing phases such as hematite and pseudobrookite. Under these conditions, the collector adsorption and hence ilmenite flotation improved, however the flotation recovery decreased after the roasting at 950 °C.
Źródło:
Physicochemical Problems of Mineral Processing; 2014, 50, 2; 493-505
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania potencjału zeta i zwilżalności szlamu węglowego z kraju morawsko-śląskiego
Research study of zeta potential and wettability of coal slurries from moravian-silesian region
Autorzy:
Thomas, J.
Vidlar, J.
Pavlik, R.
Powiązania:
https://bibliotekanauki.pl/articles/971121.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
potencjał zeta
zwilżalność
węgiel
zeta potential
wettability
coal
Opis:
Optymalnie funkcjonujący zakład przeróbki węgla ma znaczący wpływ na wynik gospodarczy przeróbki węgla surowego. Osad jest wytwarzany w zakładzie przeróbki przez oddzielanie na mokro drobnych cząstek. Głównym procesem, który polega na oddzieleniu cząsteczek węgla od skały płonnej, jest flotacja. Efektywność procesu związana jest ze składem mineralnym całej zawiesiny. Głównym celem pracy było w związku z tym zidentyfikowanie i oszacowanie różnorodnych parametrów fizycznych i chemicznych (elektrochemicznych) zawiesin węglowych. Nacisk położony został na poszczególne składniki mieszaniny szlamu węglowego jak również zastosowanie specyficznych metod w celu zbadania kontaktu fazowego węgiel-woda i kontaktu trójfazowego węgiel-woda-powietrze. Próbki węgla pobrano z aktywnego regionu kopalni Karvina CSA o granulacji technologicznej 0–0,5 mm. Wyniki badań właściwości powierzchniowych pokazują silną zależność właściwości elektrokinetycznych próbek zawiesin węglowych co jest związane z pH i wodą zmineralizowaną. Badanie pokazało potencjał zeta ładunków powierzchniowych próbek w danym pH. Relacja między wydobywanym węglem surowym i drobnymi cząsteczkami materiału węglowego, który dostarczany jest do zakładu przeróbki określona została przez potencjał zeta, kąt zwilżania i analizę termograwimetryczną. Oznaczono kąt zwilżalności, właściwości elektrokinetyczny powierzchni i rzeczywistą wartość zwilżalności wraz z widoczną oceną kontaktu trójfazowego. Wyniki pomiarów pokazały wystarczający kąt zwilżania powierzchni hydrofobowej cząsteczek węgla o wartości pomiędzy 70,14° – 77,24°.
Optimally functioning coal treatment plant circuit has a significant effect on the economic outcome of treatment of raw coal itself. Sludge is produced at the treatment plant by wet separation of fine particles. The main process, which involves the separation of coal particles from gangue grains, is the foam flotation. The effectiveness of the process depends on the mineral composition of the whole suspension. The main goal of the work was therefore focused on identification and evaluation of various physical and chemical (electrochemical) parameters in coal suspensions. Concern has been pointed on individual components of mixed coal slurries as well as on application of specific methods for the study of phase contact coal-water and three-phase contact of coal-water-air. Coal samples has been taken from active part of coal region of Mine Karvina CSA with technological granulation 0–0.5 mm. The results of the surface properties of the materials studies show a strong dependence of electrokinetic properties of samples of coal suspensions due to pH solutions and mineralized water. The study showed the zeta potential of the surface charge distribution of the samples at a pH. Relation between the mined raw coal and fine particles of coal material which is coming to coal treatment plant was characterized by zeta potential, contact angle and thermogravimetric analysis. Determination of wetting angle results of surface electrokinetic properties of real value added wettability with a visual assessment of the three-phase contact. Measurement results show sufficient wetting angle of the surface hydrophobicity of particles of coal samples with values between 70.14° – 77.24°.
Źródło:
Inżynieria Mineralna; 2013, R. 14, nr 1, 1; 55-65
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bioactivity assessment of ceramic nanoparticels used as a filler in nanocomposite materials
Autorzy:
Gęgotek, K.
Zych, Ł.
Stodolak-Zych, E.
Powiązania:
https://bibliotekanauki.pl/articles/285902.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
nanocomposite
bioactivity
scaffolds
regenerative medicine
bioceramics
zeta potential
Opis:
The paper presents research on degree of bioactivity of nanometric ceramic particles used as a nanofiller in nanocomposite materials based on polymers. The nanoperticles used in our examination were: different bioceramics powders such as: hydroxyapatite (HAp), β-phosphate (V) calcium (βTCP), silica (SiO2) and bioglass (BG). Based on ζ-potential measurements dynamics of processes occurring on the surface of nanoparticles in stimulated body fluid (SBF) was determined and it confirmed possibility of apatite formation. This study showed predominance of bioglass over other bioceramic materials, Bioglass nanoparticles were the most bioactive ones. In the end of the experiment the bioacermic particles were used as a nanofiller of poli-L/DL-lactide (PLDLA) matrix composites. The composite materials were prepared by casting from solution. Bioactivity tests were performed in simulated body fluid (artificial plasma of various ions concentration, and SBF 2SBF). Based on surface microstructure observed in the SEM (EDS) analysis were confirmed the degree of bioactivity of various materials depending on the type nanofiller.
Źródło:
Engineering of Biomaterials; 2013, 16, no. 122-123 spec. iss.; 73-74
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparative study on interactions of ionic collectors with orthoclase
Autorzy:
Ozun, S.
Atalay, M. U.
Powiązania:
https://bibliotekanauki.pl/articles/110609.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
collector interactions
zeta potential
microflotation
FTIR
AFM
orthoclase
Opis:
Flotation and adsorption characteristics of the most commonly used cationic and anionic collectors with high grade orthoclase were investigated through the electrokinetic potential measurement, microflotation, Fourier transform infrared spectroscopy (FTIR) and atomic force microscopy (AFM) studies. According to the obtained results, orthoclase had high flotation recovery with amine and oleic acid based (OAB) collector at certain pH ranges no flotation response was observed with petroleum sulfonate at different pHs. In contrast to the flotation recovery differences, the electrokinetic potential measurements, FTIR and AFM analyses presented similar adsorption characteristics for all collectors. The results of electrokinetic potential tests showed that amine had a strong influence on the zeta potential of orthoclase. While amine turned the zeta potentials of orthoclase from negative to positive, sulfonate and OAB collector provided slightly more negative zeta potentials at certain pHs. In the case of FTIR and AFM analyses, each collector-treated orthoclase (CTO) sample displayed similar characteristic FTIR bands of CH2 group and micro topographical collector coated patches with different intensities. However, the interactions of each collector with orthoclase surfaces were altered by rinsing with acetone indicating that the interactions were mostly through the electrostatic forces and/or hydrogen bonding.
Źródło:
Physicochemical Problems of Mineral Processing; 2016, 52, 2; 955-972
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oil agglomeration of metal-bearing shale in the presence of mixed cationic-anionic surfactants
Autorzy:
Polowczyk, I.
Kruszelnicki, M.
Kowalczuk, P. B.
Powiązania:
https://bibliotekanauki.pl/articles/110617.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
adsorption
zeta potential
synergism
surfactants
kerosene
hydrophobic coagulation
Opis:
This paper reports oil agglomeration of fine metal-bearing shale particles in the presence of cationic (dodecylamine hydrochloride) and anionic (sodium dodecyl sulfate) surfactants and their mixture. The experimental results demonstrated that there was a strong relationship between zeta potential, hydrophobic coagulation, oil agglomeration and particle hydrophobicity in the presence of cationic surfactant, whereas shale neither coagulated nor agglomerated in the presence of anionic surfactant. Addition of either anionic or cationic surfactant in emulsification of a bridging oil increased the size of agglomerates and reduced the concentration of surfactant used in the suspension. The results pointed to synergism between cationic and anionic surfactants in oil agglomeration. Based on the results obtained from this study, the mechanism of oil agglomeration of shale in the presence of ionic surfactants and their mixture was elucidated.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 4; 1052-1059
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of cationic-anionic surfactants on selective oil agglomeration of oil shale
Autorzy:
Abdel-Khalek, Mohamed A.
Amin, Rasha
Hassan, El-Sayed R. E.
Powiązania:
https://bibliotekanauki.pl/articles/1450561.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
oil shale
oil agglomeration
kerogen
surfactants
zeta potential
Opis:
Egyptian oil shale from Red Sea area is upgraded via oil agglomeration technique to achieve a clean fuel. A representative sample is characterized to identify its undesirable components and its liberation size. The quartz, apatite, calcite, siderite and anhydrite are the main gangue minerals. The sample was pulverized to less than 20 µm for efficient liberation. The impact of anionic (Calcium dodecyl benzene sulfonate, CDBS) or/and cationic (Cetrimonium bromide, CTAB) surfactants on the zeta-potential and agglomeration process was investigated in presence of different kerosene concentrations. A concentrate of 62% kerogen with 95% recovery was obtained from feed of 29% kerogen using 0.1% CTAB/CDBS mixture in 2% kerosene emulsion.
Źródło:
Physicochemical Problems of Mineral Processing; 2020, 56, 6; 137-144
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Pluronics and surfactant adsorption onto dolomite suspension zeta potential and stability
Autorzy:
Kozak, Anna
Sadowski, Zygmunt
Powiązania:
https://bibliotekanauki.pl/articles/764075.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
Pluronic
adsorption
synergism
zeta potential
dolomite
surfactant
sodium oleate
Opis:
Two kinds of Pluronics (PEO-PPO-PEO triblock copolymers) were used in these studies. They have mixed with anionic surfactant (sodium oleate). The adsorption isotherms of surfactant and copolymer-surfactant mixture onto dolomite have been determined.The adsorbed amount of the Pluronics increases with increasing concentration and reaches plateau. An increase of adsorbed amounts of anionic surfactant onto the mineral surfaces (dolomite) has been observed at the presence of Pluronic copolymers. The adsorption effect of triblock copolymers has been investigated on the zeta potential of dolomite at the water suspension. The interaction of anionic surfactant with copolymers causes a decrease of zeta potential to small amount due to the deformation of double electrical layer. The adsorbed non-ionic Pluronic layer partially screens the surface charge of mineral particles, and thus, reduces the zeta potential. On the other hand, the adsorption of anionic surfactant and copolymer caused a decrease of negative value of zeta potential both investigated minerals. The stability of dolomite suspension depends on the both copolymer and sodium oleate concentrations.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2015, 70, 1
2083-358X
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 57

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies