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Wyświetlanie 1-15 z 26
Tytuł:
Understanding the collection behavior of gangue minerals in fine flake graphite flotation
Autorzy:
Xu, Wenlu
Sun, Kangkang
Qiu, Yangshuai
Zhang, Lingyan
Yang, Luo
Wei, Shaowei
Ding, Dafa
Powiązania:
https://bibliotekanauki.pl/articles/2146848.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
flake graphite
mica
quartz
flotation
entrainment
Opis:
Flotation is one of the most common and effective methods for the beneficiation of natural graphite resources. However, the upgrading efficiency of flotation is always finite due to the undesirable collection of gangue minerals. In this work, the collecting mechanism of three typical gangue minerals, including mica, quartz, and feldspar, in fine flake graphite flotation was investigated. Results of batch flotation tests for single-minerals and artificial mixtures confirmed the enhanced collection of gangues in the presence of graphite particles. Contact angle and zeta potential results and theoretical calculations of the interaction between graphite and gangue particles based on typical DLVO theory indicated that it is impossible to collect gangue minerals by true flotation or through heterocoagulation with graphite particles. The fitting results of accumulated gangue recoveries and accumulated water recoveries using the Warren method demonstrated that most gangue minerals entered the concentrate through entrainment, with a small proportion by bubble inclusions.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 1; 101--112
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pre-concentration of vanadium-bearing mica from stone coal by roasting-flotation
Autorzy:
Tang, J.
Zhang, Y.
Bao, S.
Liu, C.
Powiązania:
https://bibliotekanauki.pl/articles/109373.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
roasting
flotation
vanadium bearing mica
stone coal
Opis:
In China, stone coal is an important source of vanadium. The use of roasting–floatation for the pre-concentration of vanadium bearing mica from vanadium bearing stone coal was investigated based on its mineralogical characteristics. The results showed that the vanadium occurred in mica minerals and the main gangue minerals were coal, calcite, and quartz. The pre-concentration process comprises three key steps: roasting, desliming, and flotation. The coal was completely removed by roasting at 700 °C for an hour. Slime was concentrated and the subsequent flotation pulp was improved by desliming. Calcite was removed by reverse flotation and mica was concentrated by positive floatation. During the process, the grade of V2O5 was increased from 0.71% to 1.14%, and 46.18% of the tailings were rejected. The leaching rate of vanadium was increased from 30.49% of raw ore to 69.15% of the concentrate which was an increase of about 40% at the same leaching process. This technique may promote the efficient utilization of stone coal resources.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 1; 402-412
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Depression effect of corn starch on muscovite mica at different pH values
Autorzy:
Peng, W.
Zhang, L.
Qiu, Y.
Song, S.
Powiązania:
https://bibliotekanauki.pl/articles/110573.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
muscovite mica
corn starch
pulp pH
depression effect
Opis:
The depression effect of corn starch on the surface of muscovite mica powder at different pulp pH value was investigated. The experiments were performed on single mineral, and its flotation performance was studied by flotation tests, adsorption quantity measurement, zeta-potential technique and Fourier transform infrared (FT-IR). The results indicated that the depression effect was varied with the pulp pH value when dodecylamine chloride (DDA) was used as collector, the strongest inhibitory effect appeared at pH 2 and the zeta-potential of muscovite mica increased overall after conditioned with corn starch solution. It was confirmed by the FT-IR spectra that the corn starch indeed adsorbed on the surface of muscovite mica powder and physical adsorption was occurred between muscovite mica and corn starch. This study leads to a better understanding of the depression effect of corn starch on the surface of muscovite mica powder.
Źródło:
Physicochemical Problems of Mineral Processing; 2016, 52, 2; 780-788
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of calcite and mica contents in nepheline syenite samples on the ceramic body sintering behaviours and surface roughness
Autorzy:
Durgut, Emrah
Cinar, Mustafa
Ozdemir, Orhan
Powiązania:
https://bibliotekanauki.pl/articles/2146930.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
nepheline syenite
calcite
mica
ceramic
sintering
surface roughness
Opis:
In this study, the effects of calcite and mica contents in nepheline syenite (NS) samples beneficiated by high intensity dry magnetic separation and flotation methods on ceramic bodies were investigated in detail. The NS samples were, first, sintered to observe the physical and surface roughness properties, and characterized based on the change of NS samples such as color, shrinkage, water absorption, and surface roughness after the sintering process. L-a-b color and Ra, Rz, Rt values for the NS samples were determined. The decrease in calcite and mica contents affected the surface of sintered specimens positively by reducing roughness values. Additionally, the water absorption values were found to be directly proportional to Ra values for unglazed surfaces. In conclusion, calcite and mica minerals in NS samples negatively affected surface quality by forming pinholes due to dehydroxylation and outgassing reactions in the sintering process.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 5; art. no 149179
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gamma-Irradiations Effects on Structural and Micro-Structural Parameters of Chromium(III) – Silicate Base Mica Clay
Autorzy:
Elsabawy, Khaled M.
Abou-Sekkinaa, Morsy M.
Powiązania:
https://bibliotekanauki.pl/articles/1186742.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Free fluoride
Mica clay
SEM
Structural Parameters
Synthesis
XRD
Opis:
Solution route was applied to synthesize new family of free-fluoride synthetic clay. All starting solutions were made by applying carbon tetra-chloride (CCl4) as a solvent. The selected sample of synthetic free fluoride – Na-4-mica was having the general formula (Na4Mg6M4Si4O22•nH2O) where M = Cr3+ was exposured to two different ɤ-irradiation doses 1st dose = 1.5 MR/h and 2nd dose = 3 MR/h at 25 cm distance. Structural parameters such as lattice constants, volume and phase quality were monitoring carefully by using both of XRD and SEM evaluating grain size of the mica bulk. Structural investigations proved that Cr-clay exhibits monoclinic phase accompanied with structure quality in comparison with both of Bi-and Al-clays
Źródło:
World Scientific News; 2016, 32; 13-23
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of quartz flotation from decarburized vanadium bearing coal
Autorzy:
Ren, L.
Zhang, Y.
Bian, Y.
Liu, X.
Liu, C.
Powiązania:
https://bibliotekanauki.pl/articles/110937.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
mica
vanadium-bearing coal
flotation
quartz
ion dissolution
calcium ion
Opis:
Ether diamine (Fm 2835-2L) was used as a collector for flotation of quartz. It allows flotation of quartz from mica and calcite. The adsorption mechanism of Fm 2835-2L on quartz was investigated by flotation tests, zeta-potential measurements and infra-red (FTIR) spectra measurements. Results show that Fm 2835-2L adsorbs on the quartz surface in physical adsorption with no new products, changing its zeta potentials, and increasing its hydrophobicity. The effect of calcium ions on flotation of quartz was investigated by flotation tests and zeta-potential measurements. Results show that under neutral or weakly acidic conditions calcium cation can adsorb onto the surfaces of quartz, increase the zeta potential of quartz particles, which in turn causes weaker aggregation of quartz particles and lower flotation recovery of quartz. Under the alkaline conditions the hydrolytic components of calcium are also adsorbed on the quartz surface and increase the zeta potential of quartz particles, which causes stronger aggregation of quartz particles and higher flotation recovery of quartz. However, the hydrolytic components such as CaOH+, Ca(OH)2(aq) and Ca(OH)2(s) were not formed in significant amounts in the best flotation tests.
Źródło:
Physicochemical Problems of Mineral Processing; 2015, 51, 2; 755-767
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of granites by 57Fe Mössbauer spectroscopy
Autorzy:
Hassan, Kamaleldin M.
Powiązania:
https://bibliotekanauki.pl/articles/2086511.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Mineralogiczne
Tematy:
granitic type
clinopyroxene
mica
amphibole
Mössbauer spectroscopy
oxygen fugacity
Western Desert
Opis:
Two granite complexes in Egypt, a sodic type and an aluminous type are characterized by Mössbauer spectroscopy. Mössbauer spectra (MS) of the sodic granite show a major doublet of ferric (Fe3+) iron that is attributable to octahedral coordination (M1) sites plus/minus a tetrahedron Fe3+ doublet plus/minus a doublet of ferrous (Fe2+) iron on the M1 sites plus/ minus another Fe2+ (M1) doublet and a sextet of Fe3+. The sextet is attributed to -Fe2O3 (hematite) and the other Fe components are due to NaCaFeSi2O6 (aegirine-augite) plus/minus minor contributions from (Ca2(Mg,Fe)5(Si,Al)8O22(OH)2 (magnesium-hornblende). Changes in the quadrupole splitting and width line of Fe2+ ions are likely composition-related. The MS of the aluminous-type granite, on the other hand, shows evidence only of single doublets containing Fe2+ or Fe3+ in the octahedral M1 sites, with parameters that remain almost constant. This consistency implies that the existing minerals – K(Mg,Fe2+)3 (Al,Fe3+)Si3O10(OH,F)2 (biotite), (Mg,Fe)6(Si,Al)4O10(OH)8 (clinochlore), (Na,K)Ca2(Fe,Mg)5(Al,Si)8O22(OH)2 (ferrohornblende and magnesiohornblende) – have similar iron positions. The intensity of iron oxidized (Fe3+/Fe) for the sodic granite is 79.1 to 100% and for the aluminous granite, 28.4 to 38.2%. The observed Fe3+/Fe differences between the two granites are source- -related and consistent with distributions of other redox-sensitive elements.
Źródło:
Mineralogia; 2009, 40, 1/4; 95--106
1899-8291
1899-8526
Pojawia się w:
Mineralogia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of dynamic adsorption layer formation on bubble attachment to quartz and mica surfaces in solutions of pure and mixed surface-active substances
Autorzy:
Wiertel-Pochopień, A.
Zawala, J.
Powiązania:
https://bibliotekanauki.pl/articles/109361.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
quartz
bubble
mica
dynamic adsorption layer
wetting film
three-phase contact
Opis:
The paper presents systematic studies on influence of state of dynamic adsorption layer (DAL) induced at the rising bubble interface on time-scale of the bubble attachment to quartz and mica surfaces immersed in pure n-cetyl-trimethylammonium bromide (CTAB) and mixed octanol/CTAB solutions of different concentrations. It was found that in the case of pure CTAB solutions, the influence of DAL on time of bubble attachment and the three-phase contact (TPC) formation (tTPC) strongly depends on solution concentration. Generally, two solution concentration regimes were distinguished – low and high - for which different degree of solid surfaces hydrophobization was observed. It was determined that for low concentration regime the solid surface is only slightly hydrophobized while for high regime, hydrophobicity of the solid surface is much higher. Consequently, wetting film rupture for low concentration regime is governed by electrostatic interactions while for high concentration regime significance of these interactions is much smaller. As a result, the DAL influenced the film rupture in these two regimes in a quite different manner. For mixed n-octanol/CTAB solutions it was found that CTAB molecules presence is necessary condition for wetting film destabilization. Moreover, thanks to the developed approach, allowing control of initial adsorption coverage over the bubble surface (independently on concentration), it was proved that constant adsorption degree of CTAB molecules at the bubble surface in the mixture, leads to identical times of the TPC formation.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 4; 1083-1094
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of granites by 57Fe Mössbauer spectroscopy
Autorzy:
Hassan, K. M.
Powiązania:
https://bibliotekanauki.pl/articles/2086557.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Mineralogiczne
Tematy:
granitic type
clinopyroxene
mica
amphibole
Mössbauer spectroscopy
oxygen fugacity
Western Desert
Opis:
Two granite complexes in Egypt, a sodic type and an aluminous type are characterized by Mössbauer spectroscopy. Mössbauer spectra (MS) of the sodic granite show a major doublet of ferric (Fe3+) iron that is attributable to octahedral coordination (M1) sites plus/minus a tetrahedron Fe3+ doublet plus/minus a doublet of ferrous (Fe2+) iron on the M1 sites plus/ minus another Fe2+ (M1) doublet and a sextet of Fe3+. The sextet is attributed to -Fe2O3 (hematite) and the other Fe components are due to NaCaFeSi2O6 (aegirine-augite) plus/minus minor contributions from (Ca2(Mg,Fe)5(Si,Al)8O22(OH)2 (magnesium-hornblende). Changes in the quadrupole splitting and width line of Fe2+ ions are likely composition-related. The MS of the aluminous-type granite, on the other hand, shows evidence only of single doublets containing Fe2+ or Fe3+ in the octahedral M1 sites, with parameters that remain almost constant. This consistency implies that the existing minerals – K(Mg,Fe2+)3 (Al,Fe3+)Si3O10(OH,F)2 (biotite), (Mg,Fe)6(Si,Al)4O10(OH)8 (clinochlore), (Na,K)Ca2(Fe,Mg)5(Al,Si)8O22(OH)2 (ferrohornblende and magnesiohornblende) – have similar iron positions. The intensity of iron oxidized (Fe3+/Fe) for the sodic granite is 79.1 to 100% and for the aluminous granite, 28.4 to 38.2%. The observed Fe3+/Fe differences between the two granites are source- -related and consistent with distributions of other redox-sensitive elements.
Źródło:
Mineralogia; 2009, 40, 1/4; 95--106
1899-8291
1899-8526
Pojawia się w:
Mineralogia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Problem definicyjny technologii rozproszonego rejestru (DLT) w świetle projektu rozporządzenia w sprawie rynku kryptoaktywów i zmieniający dyrektywę Unii Europejskiej 2019/1937
The definitional problem of distributed ledger technology (DLT) in view of the draft cryptoasset market regulation and amending European Union Directive 2019/1937
Autorzy:
Gronowski, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/30146167.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
distributed ledger technology
definition
cryptoassets
MiCA
technologia rozproszonego rejestru
definicja
kryptoaktywa
Opis:
W tekście tym odniesiono się do problemu, jaki niesie ze sobą próba zdefiniowania na podstawie projektu rozporządzenia w sprawie rynków kryptoaktywów i zmieniające dyrektywę (UE) 2019/1937 (MiCA) pojęcia DLT. W pierwszej kolejności umiejscowiono niezbędność definiowania w zakresie prawa cyberprzestrzeni jako prawa publicznego. Dokonano omówienia samego pojęcia według definicji technologicznej, aby w sposób możliwie przejrzysty wskazać na trzy modele stosowane w formułowaniu legalnego pojęcia DLT. Przytoczono propozycje wyspecjalizowanych organizacji międzynarodowych. Przedstawione modele omówiono, korzystając z przykładów prawodawstwa Japonii, Malty i Stanów Zjednoczonych, aby ukazać niebezpieczeństwo, jakie może potencjalnie wiązać się z każdym z nich oraz rozwiązaniem zastosowanym w MiCA. Za cel postawiono znalezienie odpowiedzi na pytania o definicję technologiczną DLT, konieczność jej ujęcia w akcie prawnym, możliwe formy definicji zastosowane w wybranych prawodawstwach oraz o właściwość wybranego sposobu na gruncie prawodawstwa Unii Europejskiej. Zwrócono uwagę, że definicja zastosowana w MiCA nie zapewnia odpowiedniej stabilności i bezpieczeństwa w systemie UE, gdzie za najwłaściwsze, uwzględniając aksjologiczne podstawy projektu rozporządzenia, uznano zastosowanie modelu odpowiadającemu rozwiązaniom przyjętym na Malcie. Do analizy wykorzystano następujące metody: teoretycznoprawną, komparatystyczną oraz, w mniejszym stopniu, aksjologiczną i dogmatyczną.
This paper addresses the problem posed by the attempt to define, on the basis of the draft Regulation on cryptoassets markets and amending Directive (EU) 2019/1937 (MiCA), the concept of DLT. The necessity of defining within the scope of cyberspace law as a public law is first positioned. A discussion of the concept itself according to the technological definition was made in order to point out as clearly as possible the three models used in the formulation of the legal concept of DLT. Proposals from specialised international organisations are cited. The models presented are discussed using the examples of the legislation of Japan, Malta and the United States, in order to show the danger that can potentially be associated with each of them and the solution used in the MiCA. The study seeks to answer questions about the technological definition of DLT, the necessity of its inclusion in a piece of legislation, the possible forms of definition used in selected legislation and the appropriateness of the chosen modality within the European Union. The study concludes that the definition used in the MiCA does not provide adequate stability and security in the EU system, where the use of a model corresponding to the solutions adopted in Malta was considered the most appropriate, taking into account the axiological basis of the draft regulation. The work is based on a theoretical-legal method and comparativism, with minimal use of axiology and dogmatics.
Źródło:
Studia Administracyjne; 2023, 18, 2; 5-16
2080-5209
2353-284X
Pojawia się w:
Studia Administracyjne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deformation structures in the gneissic exotic pebbles from the area of Wołosate (Cisna sandstone, Dukla tectonic unit, Outer Carpathians, Poland)
Autorzy:
Kania, M.
Wolska, A.
Powiązania:
https://bibliotekanauki.pl/articles/191383.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
gneissic exotic pebbles
foliation
metamorphism
mica fish
Bieszczady Mts.
Outer Carpathians
Polska
Opis:
Gneissic exotic pebbles from the Cisna beds (Dukla tectonic unit) in the region of Wołosate (Biesz- czady Mts., Eastern Carpathians) were investigated. These exotic pebbles are from 9.5 to 13 cm in size. Basing on the structural features, the following groups of exotic pebbles were distinguished: granitic gneisses, laminated gneisses, flaser gneisses and mylonitic gneisses. Granite - granodiorite protolith was deformed in the shear zone; strain partitioning was probably an important process during deformation. The observed structures allow to determine the temperature of metamorphism as 500-550°C. The lower limit of pressure was determined basing on phengite geobarometer as 5 kbar. The nature and localization of the source area can be similar to the Bretila sequence from the Romanian Eastern Carpathians.
Źródło:
Annales Societatis Geologorum Poloniae; 2009, 79, No 2; 41-52
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Use of Pinched Sluice in Albite Concentration
Wykorzystanie wzbogacalnika poziomo-prądowego do wzbogacania albitu
Autorzy:
Polat, E.
Aksoy, A. A.
Bozkaya, A.
Tunc, S.
Kucukler, M.
Guler, T.
Powiązania:
https://bibliotekanauki.pl/articles/318995.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
albit
mika
wzbogacanie grawitacyjne
efekt kształtu
albite
mica
gravity concentration
shape effect
Opis:
Albite (NaAlSi3O8) is an important industrial mineral especially for ceramic and glass production. Major Fe-containing impurity of albite ore is flaky mica minerals. This study was conducted to determine the applicability of pinched sluicing for pre-concentration of albite ore by exploiting shape effect. Effects of feed solid rate, tilting angle of pinched sluice, and splitter position on the rejection of Fe-containing flaky mica were tested. Pulp solid rate was determined to be the most important variable on the rate of mica rejection. Increasing the tilting angle adversely affected the separation efficiency especially above 17°. Distribution of gangue mica in the vertical cross-section of flowing film was tested manipulating the splitter height. Mica particles were observed to be crowded in upper layers of film thickness. So, flaky mica impurity was thought to be separated from feldspar ore, and a pre-concentrate was obtained. All Fe-containing coloring impurities could not be removed due to different mineralogical origins of them in the ore. Optimum operating variables were determined as follows: 56% feed solid rate, 17° tilting angle of pinched sluice, and splitter height lower or closer to 2/3 of the total pulp film thickness. Pulp solid rate of underflow stream almost linearly changed with respect to splitter height.
Albit (NaAlSi3O8) jest ważnym surowcem przemysłowym, szczególnie w ceramice i produkcji szkła. Najważniejszymi zanieczyszczeniami żelazowymi występującymi w albicie jest łuskowata mika. Celem badan było określenie możliwości wykorzystania wzbogacalnika poziomo-prądowego do wstępnego wzbogacania albitu z wykorzystaniem analizy kształtu. Badano wpływ natężenia przepływu nadawy, zawartości fazy stałej, geometrii strugi nadawy na efekt wydzielenia miki zawierającej zanieczyszczenia minerałami żelaza. Zawartość fazy stałej w nadawie została określona jako najważniejszy czynnik wpływający na efektywność procesu. Zwiększenie kąta nachylenia komory roboczej niekorzystnie wpływało na separację, szczególnie powyżej 17°. Badano wpływ rozdział miki w przekroju poprzecznym strumienia nadawy. Ziarna miki koncentrowały się w górnych warstwach strumienia. Stwierdzono, że drobne ziarna miki oddzielają się od rudy skaleniowej i można otrzymać prekoncentrat. Z uwagi na sposób występowania zanieczyszczeń nie można wydzielić wszystkich zanieczyszczeń barwiących. Określono optymalne parametry procesu: zawartość fazy stałej w nadawie 56%, kąt nachylenia rynny podawczej 17°, a wysokość rozdzielacza strugi niższa od 2/3 całkowitej grubości warstwy materiału.
Źródło:
Inżynieria Mineralna; 2017, R. 18, nr 1, 1; 33-38
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pigmenty perłowe do dekorowania wyrobów ceramicznych
Pearlescent pigments for ceramic products decor
Autorzy:
Dziubak, C.
Powiązania:
https://bibliotekanauki.pl/articles/169051.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Ceramiki i Materiałów Budowlanych
Tematy:
pigmenty perłowe
opalizacja
interferencja
podłoże mikowe
pearlescent pigments
iridescence
interference
mica substrate
Opis:
Syntetyczne pigmenty perłowe naśladują efekty luminancji i opalizacji będące wynikiem biomineralizacji w świecie zwierzęcym, której przykładem są perły, muszle, rybie łuski, skrzydła owadów. Pigmenty te o połysku brylantowym i perłowym charakteryzują się dużą siłą krycia, stabilnością barwy i odpornością na działanie promieniowania świetlnego i czynników atmosferycznych. Pigmenty są nietoksyczne, a ich produkcja spełnia wymogi ochrony środowiska. Są używane do dekorowania tworzyw sztucznych, sporządzania preparatów perłowych, opalizujących lub dających efekty metaliczne o wysokim połysku, jako tusze drukarskie, kosmetyki, lakiery samochodowe oraz farby ceramiczne. Najbardziej rozpowszechnione są pigmenty perłowe na podłożu mikowym o niskim współczynniku załamania światła, mające co najmniej trzy warstwy dwóch materiałów o różnych współczynnikach załamania: TiO2, SnO2, Fe2O3. Warstwy interferencyjne nanoszone są na podłoże mikowe w procesie chemicznym na mokro w wyniku hydrolizy odpowiednich soli metali grup przejściowych. W procesie kalcynacji, w wyniku termicznych przemian związków hydroksylowych, na ziarnach miki następuje utrwalanie warstw interferencyjnych w postaci tlenków metali chromoforowych. Odporność termiczna dzięki odpowiednio dobranym parametrom procesu technologicznego stanowi kryterium stosowalności syntetycznych pigmentów perłowych w ceramice.
Synthetic pearlescent pigments imitate the effects of brightness and iridescence that is the result of biomineralization in the animal world, exemplified by pearls, shells, fish scales, and wings of insects. These pigment, with diamond and pearl gloss, have high coating capacity, colour stability and resistance to UV light and weathering. Pigments are non-toxic, and their production meets environmental requirements. They are used for plastics decoration, preparation of pearlescent preparations, iridescent or giving high gloss metallic effect, as printing inks, cosmetics, automotive paints and ceramic paints. The most common pigments are pearlescent pigments on mica substrate with a low refraction index, having at least three layers of two materials with different refractive indices: TiO2, SnO2, Fe2O3. Interference layers are applied to the mica substrate in wet chemical process as a result of hydrolysis of appropriate salts of metals from transition groups. In calcination process, as result of thermal changes of hydroxyl compounds, the interference layers are permanently deposited on mica platelets in form of chromophoric metals oxides. Thermal resistance through appropriately selected parameters of the technological process is the criterion of applicability the synthetic pearl pigments in ceramics.
Źródło:
Szkło i Ceramika; 2016, R. 67, nr 5, 5; 8-12
0039-8144
Pojawia się w:
Szkło i Ceramika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deformation structures in the gneissic exotic pebbles from the area of Wołosate (Cisna sandstone, Dukla tectonic unit, Outer Carpathians, Poland)
Autorzy:
Kania, M.
Wolska, A.
Powiązania:
https://bibliotekanauki.pl/articles/191901.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
gneissic exotic pebbles
foliation
metamorphism
mica fish
Bieszczady Mts.
Outer Carpathians
Polska
Opis:
Gneissic exotic pebbles from the Cisna beds (Dukla tectonic unit) in the region of Wołosate (Bieszczady Mts., Eastern Carpathians) were investigated. These exotic pebbles are from 9.5 to 13 cm in size. Basing on the structural features, the following groups of exotic pebbles were distinguished: granitic gneisses, laminated gneisses, flaser gneisses and mylonitic gneisses. Granite - granodiorite protolith was deformed in the shear zone; strain partitioning was probably an important process during deformation. The observed structures allow to determine the temperature of metamorphism as 500-550°C. The lower limit of pressure was determined basing on phengite geobarometer as 5 kbar. The nature and localization of the source area can be similar to the Bretila sequence from the Romanian Eastern Carpathians.
Źródło:
Annales Societatis Geologorum Poloniae; 2009, 79, No 1; 41-52
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Digital asset capital market law - a new discipline of private law
Autorzy:
Zacharzewski, Konrad
Powiązania:
https://bibliotekanauki.pl/articles/2082967.pdf
Data publikacji:
2021
Wydawca:
Akademia Leona Koźmińskiego w Warszawie
Tematy:
MiCA Regulation
bitcoin
cryptocurrency
crypto-assets
crypto-asset capital market
capital market
Opis:
The research objective of the publication is expressed in its content devoted to the general analysis of the solutions adopted in the draft regulation of the European Union on the digital asset market. The entry of this legal act into force will fill the so-called ‘regulatory gap’ as the digital asset sector is not regulated in the EU. The research approach has been determined by the subject of the legal analysis, namely the provisions of the proposed new EU regulation on the digital asset market. The study describes the proposed legal regulation and its systemic importance, as well as indicates the similarity of the proposed solutions to well-known legal institutions in the area of the capital market. The main theses are as follows: the proposed legal act will order the digital asset market in terms of law (firstly); the proposed legal act in terms of content is based on solutions provided for in the capital market law (secondly); the proposed legal act provides for legal institutions ensuring the so-called safety of trading (thirdly). The results should be considered original because the publication constitutes a pioneering study on the proposed legal act. With its entry into force (the date is unknown), a discussion on specific topics will begin in the science of law. Therefore, it is worth speaking up and evaluating the proposed regulation before the new law is passed. The cognitive value of the publication results from its pioneering nature, and the impact on social relations is significant. The digital asset market is developing extremely dynamically, and the interest in this sector is very high.
Źródło:
Krytyka Prawa. Niezależne Studia nad Prawem; 2021, 13, 2; 195-208
2080-1084
2450-7938
Pojawia się w:
Krytyka Prawa. Niezależne Studia nad Prawem
Dostawca treści:
Biblioteka Nauki
Artykuł
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