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Wyszukujesz frazę "containing" wg kryterium: Temat


Tytuł:
Expression characteristics of triplet repeat-containing RNAs and triplet repeat-interacting proteins in human tissues
Autorzy:
Jasinska, Anna
Kozlowski, Piotr
Krzyzosiak, Wlodzimierz
Powiązania:
https://bibliotekanauki.pl/articles/1040767.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
CUG-containing transcripts
RNA pathogenesis
CAG-containing transcripts
EST
Opis:
Numerous human transcripts contain tandem repeats of trinucleotide motifs, the function of which remains unknown. In this study we used the available gene expression EST data to characterize the abundance of a large group of these transcripts in different tissues and determine the mRNAs which had the highest contribution to the observed levels of transcripts containing different types of the CNG repeats. A more extensive characteristics was performed for transcripts containing the CUG repeats, and those encoding the repeat-binding proteins. The scarcity of double-stranded CUG repeats as well as various proportions of the single-stranded and double-stranded CUG repeat-binding proteins were revealed in the studied transcriptomes. The observed correlated levels of transcripts containing single-stranded CUG repeats and of proteins binding single-stranded CUG repeats may imply that in addition to transcripts which only provide binding sites for these proteins there may be a substantial portion of the transcripts whose metabolism is directly regulated by such proteins. Our results showing a highly variable composition of triplet repeat-containing transcripts and their interacting proteins in different tissues may contribute to a better understanding of the mechanism of RNA-mediated pathogenesis in triplet repeat expansion diseases.
Źródło:
Acta Biochimica Polonica; 2008, 55, 1; 1-8
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Green Algae as a Way to Utilize Phosphorus Waste
Autorzy:
Tleukeyeva, Assel
Pankiewicz, Radoslaw
Issayeva, Akmaral
Alibayev, Nuradin
Tleukeyev, Zhanbolat
Powiązania:
https://bibliotekanauki.pl/articles/2027881.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
Chlorella vulgaris
phosphorus-containing wastewater
algae
phosphorus-containing waste
agriculture
Opis:
The possibility of using phosphorus-containing wastewater as a raw material for the cultivation of the green algae strain Chlorella vulgaris ASLI-1 can represent an effective processing of phosphorus-containing by-products. A laboratory experiment was made to study the effect of the concentration of phosphorus-containing wastewater on the biomass density of the green alga strain Chlorella vulgaris ASLI-1. Three weeks after sowing, we measured the biomass density of algae in various components of the phosphorus-containing wastewater. Compared to the control (distilled water), the addition of phosphorus-containing wastes did not adversely affect the culture of green algae, with the exception of a 20% medium where algal cells were discolored and had a low biomass density, 104 CFU. However, more research is needed to better study the response of green algae to phosphorus-containing waste, to determine the amount of phosphorus in cells and solution. In addition, evaluate the agronomic efficiency of the Chlorella vulgaris ASLI-1 strain, cultivated on phosphorus-containing waste, when applying fertilizers for growing vegetables.
Źródło:
Journal of Ecological Engineering; 2021, 22, 10; 235-240
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and characterization of linear and crosslinked polymers with the addition of DMSPS
Autorzy:
Fila, Karolina
Podkościelna, Beata
Powiązania:
https://bibliotekanauki.pl/articles/2079962.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
sulfur-containing polymers
bulk polymerization
thermal analysis
hardness test
Opis:
The aim of this research was the synthesis of polymers with the addition of S,S'-thiodi-4,1-phenylene bis(thiomethacrylate) (DMSPS) by bulk polymerization. Styrene (St), divinylbenzene (DVB) and ethylene glycol dimethacrylate (EGDMA) were used for the copolymerization as main monomers. The chemical structures of sulfur-containing polymers were confirmed by the spectroscopic analysis (ATR/FT-IR). In order to determine the impact of the sulfur derivative (DMSPS) addition on thermal properties of the obtained copolymers, differential scanning calorimetry (DSC) was performed. The hardness tests of the obtained copolymers were also applied using a Shore durometer.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2018, 73, 1; 1-10
2083-358X
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative study on the usefulness of Gentamycin-containing collagen implants in the treatment of patients with osteitis and osteomyelitis of the craniofacial skeleton
Autorzy:
Zawadzki, Paweł J.
Perkowski, Konrad
Kotlarski, Michał
Pietruczuk-Padzik, Anna
Chomicz, Lidia
Powiązania:
https://bibliotekanauki.pl/articles/989759.pdf
Data publikacji:
2017
Wydawca:
Instytut Medycyny Wsi
Tematy:
comparative study
gentamycin-containing collagen treatment patients
osteomyelitis
craniofacial skeleton
Opis:
Introduction and objective. A reduction in incidences of peri-surgical complications due to infections is achieved by antibiotic prophylaxis The objective of the study was to assess the usefulness of gentamycin-containing collagen implants (GCCI) in the treatment of patients with osteitis and osteomyelitis of the craniofacial skeleton. Materials and method. The retrospective study included 103 patients with osteitis and osteomyelitis. 54 patients were treated intra-operatively with GCCI (Garamycin, EusaPharma, Europe). 49 patients were treated according to standard procedures. Light microscopy and in vitro culture techniques were applied for bacteria specific identification, and to investigate the resistance of detected microbiota to antibiotics. Patients received one dose of antibiotic pre-operatively. Post-operative antibiotic treatment was administered individually, according to clinical course and microbiological tests. The patients were followed-up on days 3, 7 and 14 after discharge for local complications; radiographic follow-up was performed 3, 6 and 12 months after surgery. Results. The course of post-operative antibiotic therapy was shorter in GCCI patients than in the control group (median 1 vs. 7 days); they also required shorter hospitalization (median 3 vs. 4 days). Implantation of GCCI significantly reduced the incidence of local complications (OR 0.30, 95%CI 0.11–0.83, p<0.0001), independently of the use of postoperative antibiotic therapy. On follow-up after 3–12 months, all patients presented with good soft tissue and bone healing. Conclusions. The results of this comparative study advocate the use of GCCI in osteomyelitis of various origin in oral and maxillofacial surgery, as they seemed to reduce the incidence of local complications, shorten antibiotic administration time and hospital stay.
Źródło:
Annals of Agricultural and Environmental Medicine; 2017, 24, 2
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oczyszczanie kraju z azbestu – realizacja programu na lata 2009-2032
Removing Asbestos from the Country – Implementation of the Programme for the years 2009-2032
Autorzy:
Nowak, Jolanta
Szewczyk, Przemysław
Powiązania:
https://bibliotekanauki.pl/articles/416508.pdf
Data publikacji:
2016-12
Wydawca:
Najwyższa Izba Kontroli
Tematy:
asbestos
Asbestos Base
Chief Coordinator
removing asbestos
produce containing asbestos
Opis:
Asbestos is one of the substances with carcinogenic effects, resulting from inhaling of fibres present in the air. Production of asbestos-based products was banned in Poland in 1999. Moreover, a government programme was developed aimed at eliminating asbestos and products made of it from our country by 2032. In 2015, NIK audited the realisation of the tasks set out in this programme, as well as in the programmes of individual local self-government units. The audit also examined whether the owners, users of perpetual lease and administrators of estates properly performed the tasks imposed on them by the Ministry of Economy, local self-government units and local branches of the Agricultural Property Agency (ANR) in the years 2009–2015.
Źródło:
Kontrola Państwowa; 2016, 61, 6 (371); 77-90
0452-5027
Pojawia się w:
Kontrola Państwowa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Electronic Spatial Information System – tools for the monitoring of asbestos in Poland
Autorzy:
Krówczyńska, Małgorzata
Wilk, Ewa
Zagajewski, Bogdan
Powiązania:
https://bibliotekanauki.pl/articles/2037415.pdf
Data publikacji:
2014-06-25
Wydawca:
Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
Tematy:
Asbestos
asbestos-containing products
GIS
monitoring
asbestos removal process
Polska
Opis:
On January 1, 2005 the use of asbestos-containing products was banned in the European Union. According to the Act of 19 June 1997 banning the use of these products, their usage in Poland should be abated by the end of 2032. The whole process is being monitored by the Electronic Spatial Information System for the Monitoring of Asbestos Products Removal. The system design was based on a geodatabase. The research area of the study is the whole territory of Poland at the national, provincial and local level of detail. The monitoring process embraces spatial analysis through the preparation and interpretation of a range of maps. The results obtained from the deployed methods proved that the system has been useful for decision making purposes during the monitoring process. The proposed solutions were appreciated by the EU.
Źródło:
Miscellanea Geographica. Regional Studies on Development; 2014, 18, 2; 59-64
0867-6046
2084-6118
Pojawia się w:
Miscellanea Geographica. Regional Studies on Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Complex electrothermal processing of an oxide zinc-containing ore of the Shaymerden deposit
Autorzy:
Shevko, V.
Karataeva, G.
Tuleev, M.
Badikova, A.
Amanov, D.
Abzhanova, A.
Powiązania:
https://bibliotekanauki.pl/articles/110855.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
calcium carbide
electrosmelting
zinc-containing oxide ore
ferroalloy
zinc sublimates
Opis:
Oxide ores are potential world raw materials sources of zinc manufacture. Despite a sufficiently high extraction level of zinc and lead known pyrometallurgical methods are characterized by formation of large quantity of industrial wastes therefore a complex use level of these raw materials is low. Hydrometallurgical methods are mainly applied for extraction of nonferrous metals. The present article contains the research results of complex processing an oxide ore of the Shaymerden deposit (Kazakhstan), consisting in the simultaneous production of a ferroalloy, calcium carbide and zinc sublimates from the ore in a thermal-ore arc electric furnace. The researches have been carried out with use of a HSC 5.1 software package (based on a principle of Gibbs energy minimum) and electrical smelting the ore in a monoelectrode arc electric controlled-output furnace. It was found, that in equilibrium conditions in a system ore-carbon-iron gaseous zinc is formed at Т > 1073 K, FeSi at Т > 1573 K, CaC2 at Т > 2073 K, Si at Т > 1673 K. The electrosmelting of ore in an arc furnace using of 38.7-40% coke and 16-28.4% steel cuttings the conversion degree of silicon into an alloy is 75-77%, calcium to calcium carbide 77-81%, zinc to sublimates 99.3%. The ferroalloy obtained contains 19.6-41.3% of silicon, the calcium carbide is characterized by capacity of 110-250 m3/kg, and the zinc sublimates contain 66-67% of zinc. The -suggested method allows to increase the combined usage of the ore from 35.6 to 89.6%.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 3; 955-964
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determinants influencing the amount of asbestos-cement roofing in Poland
Autorzy:
Wilk, Ewa
Krówczyńska, Małgorzata
Pabianek, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/2085546.pdf
Data publikacji:
2015-11-10
Wydawca:
Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
Tematy:
Asbestos
asbestos-containing products
GIS
monitoring
asbestos removal process
Polska
Opis:
Because of its harmfulness to human health, asbestos has been banned in 55 countries, including the EU. In Poland, the use and production of asbestos and asbestos-containing products has been forbidden since 1997. However, there is no precise data about the amount of asbestoscontaining products to be eliminated from the territory of Poland. This survey aims to identify characteristics that have a significant impact on the estimation of asbestos-containing products used in Poland. Statistical correlation between the results of the physical inventory count done in 155 municipalities was examined. As a result of the survey it was found that the amount of asbestos-cement roofing depends on the following factors: the number of individual farms in the village, the distance from the asbestos manufacturing plants, the age of the buildings and the economic situation of municipality. The results obtained may contribute to the ability to predict the amount of asbestos-containing products used in other municipalities.
Źródło:
Miscellanea Geographica. Regional Studies on Development; 2015, 19, 3; 82-86
0867-6046
2084-6118
Pojawia się w:
Miscellanea Geographica. Regional Studies on Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and dynamics of water adsorbed on the lignite surface: Molecular dynamics simulation
Autorzy:
You, Xiaofang
He, Meng
Cao, Xiaoqiang
Lyu, Xianjun
Li, Lin
Powiązania:
https://bibliotekanauki.pl/articles/109688.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
low rank coal
water molecule
oxygen-containing functional groups
molecular dynamics
Opis:
The effects of oxygen-containing functional groups on the structure and dynamic properties of water molecules near a lignite surface were investigated through molecular dynamics (MD) simulations. Because of its complex composition and structure, a graphite surface containing hydroxyl, carboxyl, and carbonyl groups was used to represent the lignite surface model. According to X-ray photoelectron spectroscopic (XPS) results, the composing proportion of hydroxyl, carbonyl and carboxyl is 21:13:6. The density profiles of oxygen and hydrogen atoms indicate that the brown coal surface characteristics influence the structural and dynamic properties of water molecules. The interfacial water is much more ordered than bulk water. The results of the radial distribution functions, mean square displacements, and local self-diffusion coefficients for the water molecules in the vicinity of three oxygen-containing functional groups confirmed that carboxyl groups are the preferential adsorption sites.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 1; 10-20
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Use of Phosphorus-Containing Waste and Algae to Produce Biofertilizer for Tomatoes
Autorzy:
Tleukeyeva, Assel
Alibayev, Nuradin
Issayeva, Akmaral
Mambetova, Lyazzat
Sattarova, Aygul
Issayev, Yerzhan
Powiązania:
https://bibliotekanauki.pl/articles/2027806.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
phosphorus-containing waste
chlorella
biofertilizer
Solanum lycopersicum
phosphorus slag
phosphorus sludge
Opis:
The current state of phosphorus-containing waste and the methods of its disposal remain relevant. The storage of phosphorus-containing waste sludge is carried out in sludge collectors, which occupy large areas. With the disposal of slags and sludge, as well as the elimination of sludge collectors, the harmful effect of waste on the soil will cease, and the possibility of using these areas for economic land use will appear. Many studies show the movement of phosphorus in soil and water, thus proving the difficulty of disposing of this waste. Of course, phosphorus slags and sludge are used in small quantities in the production of building materials, but this does not solve all the problems. In the south of Kazakhstan, there are warehouses for the waste from the production of phosphorus-containing fertilizers, which also require disposal. One of the ways of modern utilization of these wastes is their use in fertilizers for agriculture. However, since the phosphorus-containing waste has a high content of phosphorus, compared to nitrogen and potassium, this ratio can be changed with the addition of chlorella biomass. The purpose of the conducted study was to investigate the possibility of using a complex of phosphorus waste and algae, that is, the cultivation of chlorella at various concentrations of phosphorus-containing waste for further use of the suspension in watering the test plant. In the form of a test plant, tomato seeds were chosen, the cultivation of which in agriculture is economically profitable. When cultivated in closed ground, tomatoes lose their taste, which can be restored with the use of organic fertilizers. This article shows the results of the influence of various concentrations of phosphorus waste and green microalgae on the growth and development of Solanum lycopersicum.
Źródło:
Journal of Ecological Engineering; 2022, 23, 2; 48-52
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identyfikacja projekcyjna - od rzeczywistości intrapsychicznej do interpersonalnej
Projective identification - from internal reality to interpersonal reality
Autorzy:
Groth, Jarosław
Powiązania:
https://bibliotekanauki.pl/articles/2128456.pdf
Data publikacji:
2019-03-29
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL
Tematy:
projective identification
projection
object relation
fantasy
psychic reality
containing
interpersonal relation
Opis:
Począwszy od opublikowania w 1946 roku przez Melanie Klein klasycznego już dziś opisu identyfikacji projekcyjnej, zjawisko to w coraz większym stopniu zajmowało uwagę psychoanalityków, stając się z czasem jednym z centralnych punktów teorii i praktyki psychoanalitycznej. Jak zauważa Roth (2008, s. 250), ze wszystkich odkryć Klein to właśnie zyskało najbardziej powszechną aprobatę. Celem tego artykułu jest próba scharakteryzowania identyfikacji projekcyjnej w świetle ewolucji, jakiej podlegał ten koncept – od lokowania go wyłącznie w wymiarze imaginacyjności po rozpoznanie znaczenia jego obecności w rzeczywistości społecznej. Fenomen identyfikacji projekcyjnej rozpatrywany jest w niniejszym artykule z perspektywy koncepcji Klein – twórczyni tego konstruktu – oraz z punktu widzenia dwóch kluczowych dla rozwoju tego pojęcia koncepcji, autorstwa W. R. Biona i T. H. Ogdena. Prezentacja tych perspektyw ma służyć ukazaniu złożoności tego zjawiska i bogactwa obszarów jego zastosowania oraz ewolucji pojmowania tego mechanizmu – od koncentracji na tym, co intrapsychiczne, po stan, kiedy w równej mierze zwraca się uwagę również na to, co interpersonalne.
The aim of this article is to present the mechanism of projective identification, one of the crucial constructs of both classical and contemporary psychoanalysis. The phenomenon of projective identification is discussed from the point of view of M. Klein – the creator of this construct – and from the perspectives of W. R. Bion and T. H. Ogden, the authors of two fundamental theories of this mechanism. The presentation of these points of view serves to show the complexity of this phenomenon and the variety of areas for its application. The aim of the paper is to show the evolution of how this mechanism was understood, from the focus on what is intrapsychic and imaginative, to the recognition of the importance of its activity in the area of interpersonal reality.
Źródło:
Roczniki Psychologiczne; 2011, 14, 1; 159-175
1507-7888
Pojawia się w:
Roczniki Psychologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mapping asbestos-cement roofing with the use of APEX hyperspectral airborne imagery: Karpacz area, Poland – a case study
Autorzy:
Krówczyńska, Małgorzata
Wilk, Ewa
Pabjanek, Piotr
Zagajewski, Bogdan
Meuleman, Koen
Powiązania:
https://bibliotekanauki.pl/articles/1035955.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
Tematy:
Asbestos
asbestos containing products
SAM classification
APEX data
asbestos removal process
Polska
Opis:
Asbestos and asbestos containing products are harmful to human health, and therefore its use has been legally forbidden in the EU. Since there is no adequate data on the amount of asbestos-cement roofing in Poland, the objective of this study was to map asbestos-cement roofing with the use of hyperspectral APEX data (288 bands at the spatial resolution of 2.7 m) in the Karpacz area (southwest Poland). A field survey constituted the basis for training and verification polygons in the classification process. A SAM classification method was performed with the following classification results: 62% producer’s accuracy, 73% user’s accuracy and an overall accuracy of 95%. The asbestos-cement roofing for buildings may be discriminated with a high classification accuracy with the use of hyperspectral imagery. The vast majority of the classified buildings were characterised by their small area (i.e. residential type buildings), which reduced the overall accuracy of the classification.
Źródło:
Miscellanea Geographica. Regional Studies on Development; 2016, 20, 1; 41-46
0867-6046
2084-6118
Pojawia się w:
Miscellanea Geographica. Regional Studies on Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kinetic study of oil-containing wastewater treatment with the use of natural sorbents
Autorzy:
Tleuova, Saltanat T.
Userbayeva, Banu A.
Tleuov, Alibek S.
Yeskendirova, Marina M.
Yakubova, Raissa R.
Kerimbayeva, Kulyash Z.
Powiązania:
https://bibliotekanauki.pl/articles/1844339.pdf
Data publikacji:
2021
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
filtration
heavy metal ions
industrial wastewater
kinetics
oil-containing wastewater
sorption materials
Opis:
The study has investigated the technical characteristics of a number of sorption materials (natural mineral) and the possibility of their use for the purification of surface and wastewater from oil and oil products. At the first step, regularities of the process of purification of oily waters have been established taking into account the processes of filtration and sorption. After that, the sorption capacity of the sorbents has been estimated, and the factors influencing it analysed. As a final step, the optimal conditions for the sorption process have been selected depending on the conditions and nature of purification. Results indicated that the maximum purification degree has been reached at the concentration of 500 mg∙dm–3 and temperature of 20°С.
Źródło:
Journal of Water and Land Development; 2021, 49; 252-258
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biodegradable lubricant for railway transport
Биоразлагаемый смазочный материал для железнодорожного транспорта
Autorzy:
Boiko, M.
Lebedinsky, K.
Powiązania:
https://bibliotekanauki.pl/articles/374735.pdf
Data publikacji:
2015
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
biodegradable lubricant
boron-containing antiscoring additives
railway transport
smar biodegradowalny
transport kolejowy
Opis:
Boron-containing lubricant for rail-curve lubrication is developed. Its effectiveness was proved by series of experiments carried out on different types of friction machines. The mechanism of antiscoring effect of boron-containing additives was analyzed in terms of physical adsorption.
Разработан смазочный материал для контакта колесо-рельс, содержащий борную присадку. Его эффективность была подтверждена серией опытов на различных типах машин трения. Механизм противозадирного действия борной присадки был проанализирован с позиции физической адсорбции.
Źródło:
Transport Problems; 2015, 10, 4; 99-105
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhancing low-rank coal flotation using a mixture of dodecane and n-valeraldehyde as a collector
Autorzy:
Liu, Zechen
Liao, Yinfei
An, Maoyan
Lai, Qingteng
Ma, Longfei
Qiu, Yuliang
Powiązania:
https://bibliotekanauki.pl/articles/109432.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
mixed collector
oxygen-containing functional groups
adsorption mechanism
low rank coal
flotation
Opis:
Low-rank coals are difficult to float using common hydrocarbon oily collectors, such as dodecane and diesel. In this investigation, a mixture of dodecane and n-valeraldehyde was used as a collector to enhance low-rank coal flotation. The changes of the contact angle and surface functional groups of low-rank coal were measured before and after different collectors’ adsorption to indicate its absorption mechanism. Surface tension of different collectors was also measured to identify its spreading performance. The results showed that the flotation performance using the mixture as a collector was much better than that using dodecane or n-valeraldehyde solely. When used the mixture of dodecane and n-valeraldehyde as collector, dodecane primarily covers the hydrophobic sites while n-valeraldehyde primarily covered the hydrophilic sites by hydrogen bond promoting adsorption of dodecane at these sites. There existed synergistic effect between dodecane and n-valeraldehyde. Additionally, n-valeraldehyde can reduce the surface tensions to improve the spreading performance of mixed collector on low-rank coal surface. The improvement both in adsorption and spreading was responsible for the enhancement of low-rank coal flotation by using the mixture.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 1; 49-57
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł

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