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Tytuł:
Exploration and characterization of barite mineral from Azara-Nassarawa ore deposits from suitabiity in industrial applications
Autorzy:
Nzeh, Nnaemeka Stanislaus
Popoola, Patricia Abimbola
Powiązania:
https://bibliotekanauki.pl/articles/24085980.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
barite
mineral ore
Azara-Nassarawa
gravity concentration
jigging
tabling
concentrate
recovery
specific gravity
Opis:
Primary concentrations of Azara barite deposit in Nassarawa state, Nigeria were conducted; employing simplified gravity concentration techniques. Particle size distribution, specific gravity, physicochemical and morphological analyses of the sample was conducted. These analyses were done in order to establish process efficacy and effectiveness of gravity concentration processes for recovery of barium from the ore deposit, as well as its suitability in various industrial applications, such as the oil and gas sectors. Thus, microstructural, chemical composition and certain physicochemical characteristics/properties of the mineral sample of Azara-Nassarawa barite were determined. XRD, XRF, SEM and EDS analyses were utilized in determining morphology as well as quantitative and qualitative chemical analyses of the sample. Barite sample with average particle size of -355+150μm was subjected to concentration, adopting jigging and tabling gravity separation as the concentration methods. Hitherto, based on quantitative and qualitative chemical analyses conducted, the sample was composed of about 36.2% BaO and 40.5% Ba, respectively; and also possessed an average specific gravity (SG) of about 3.85. Further, the qualitative analysis of the mineral products of jiggling and tabling indicated that jigging had a concentrate recovery of 130.98% Ba with SG increase of 11.2% while tabling had 89.81% Ba recovery with 8.6% SG increase. Assay and SG results confirm gravity concentration efficiency and thus, establish the barite from Azara-Nassarawa ore deposits suitable for certain industrial applications. This will serve as a tool and a step further towards mitigating existing problems or challenges in mineral concentration and processing of such deposits for industrial purposes.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 2; art. no. 166104
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mineralizacja kruszcowa w skałach ultramaficznych pasma Mnicha w zachodniej części masywu Braszowice–Brzeźnica (Dolny Śląsk)
Ore mineralization in ultramafics from the Mnich Ridge from western part of the Braszowice–Brzeźnica Massif (Lower Silesia)
Autorzy:
Sadłowska, K.
Powiązania:
https://bibliotekanauki.pl/articles/2062920.pdf
Data publikacji:
2011
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
ofiolit
chromit
magnetyt
siarczki niklu
serpentynizacja
serpentynity
minerał kruszcowy
ophiolite
chromite
magnetite
nickel sulphide
serpentinisation
serpentinites
ore mineral
Opis:
Skały ultramaficzne masywu Braszowice–Brzeźnica to głównie harzburgity, dunity i lherzolity, które w różnym stopniu uległy serpentynizacji. Stanowią one wyższą część członu ultramaficznego sekwencji ofiolitu sudeckiego. Skały ultramaficzne sekwencji ofiolitowych są znane z wystąpień złóż: chromu, niklu, kobaltu oraz pierwiastków grupy platyny. W badanych skałach minerały kruszcowe to przede wszystkim tlenki: chromit, spinel Fe-Cr i magnetyt. Wśród siarczków dominują siarczki niklu i żelaza, różniące się między sobą proporcjami tych dwóch pierwiastków. Zidentyfikowane siarczki to: heazlewoodyt (Ni3S2), pentlandyt (Ni,Fe)9S8, milleryt (NiS) i godlewskit (Ni7S6). W siarczkach zidentyfikowano wrostki arsenków niklu. Minerały kruszcowe występują w formie rozproszonej, ich ziarna są ksenomorficzne, o zróżnicowanych rozmiarach od kilku µm do 4 mm. Pierwotne minerały kruszcowe – chromit, pentlandyt, pirotyn i chalkopiryt w procesie serpentynizacji uległy przemianom, w wyniku czego powstały wtórne minerały kruszczowe – spinel Fe-Cr, cztery generacje magnetytu, siarczki Ni-Fe oraz arsenki niklu. W czasie serpentynizacji ze struktury chromitu był odprowadzany Cr, Al, Mg, a w ich miejsce podstawiane było Fe. W wyniku tego procesu krystalizował ferrichromit i magnetyt Ia. Magnetyt Ib wykrystalizował w pseudomorfozach po oliwinach i piroksenach. W zaawansowanym stadium serpentynizacji krystalizował magnetyt II równocześnie z siarczkami.
Ultramafic rocks of the Braszowice–Brzeznica massif consist of harzburgites, dunites and lherzolites that are serpentinised in various degree. These rocks are regard as upper part of ultramafic sequence of the Sudetic ophiolite complex. Ultramafic rocks of ophiolite sequences are often associated with important mineral deposits like chrome, nickel, cobalt and PGE. EPMA analyses show that the most aboundant ore minerals are oxides like chromite, ferrichromite, magnetite. Sulphide ore minerals are mainly Fe-Ni sulphides. Documented sulphides are: heazlewoodite (Ni3S2), pentlandite(Ni,Fe)9S8, millerite (NiS), godlevskite (Ni7S6). In some sulphide grains occur nickel arsenides inclusions. Ore mineral are dispersed, forms xenomorphic grains from several µm to 4 mm in size. Primary ore minerals like chromite, pentlandite, pyrrhotite and chalkopyrite were affected by fluids, which results in precipitation of secondary mineral phases: Fe-Cr spinel, four generations of magnetite, Fe-Ni sulphides and Ni arsenides. During serpentinisation Cr, Al, Mg in chromite strutcutre were replaced by Fe. Result of this alteration is Fe-Cr spinel and magnetite Ia. Magnetite Ib crystalized in pseudomorphs after olivines and pyroxenenes. Magnetite II precipitate simultaneously with sulphides.
Źródło:
Biuletyn Państwowego Instytutu Geologicznego; 2011, 447; 99--116
0867-6143
Pojawia się w:
Biuletyn Państwowego Instytutu Geologicznego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cobalt-rich lithiophorite from the Precambrian Eastern Ghats manganese ore deposit of Nishikhal, south Orissa, India
Autorzy:
Rao, D. S.
Nayak, B. K.
Acharya, B. C.
Powiązania:
https://bibliotekanauki.pl/articles/2086547.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Mineralogiczne
Tematy:
Nishikhal
manganese ore
lithiophorite
mineral chemistry
Opis:
Fine-grained aggregates of lithiophorite are associated with cryptomelane, romanèchite, birnessite and graphite in the Precambrian Eastern Ghats manganese ore deposit of Nishikhal, south Orissa, India. High-cobalt lithiophorite is reported for the first time from the manganese ores. The mode of occurrence and the chemical composition of the lithiophorite are discussed. Along with manganese and aluminium, the lithiophorite contains appreciable quantities of CoO (1.59-8.56%) together with trace amounts of Cu, Ni, Zn, Ti, Ca, Mg, Na, K and P. The Nishikhal lithiophorite is a transition metal-rich lithiophorite.
Źródło:
Mineralogia; 2010, 41, 1/2; 11--21
1899-8291
1899-8526
Pojawia się w:
Mineralogia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cobalt-rich lithiophorite from the Precambrian Eastern Ghats manganese ore deposit of Nishikhal, south Orissa, India
Autorzy:
Rao, Danda S.
Nayak, Bijaya K.
Acharya, Bhaskar C.
Powiązania:
https://bibliotekanauki.pl/articles/2086504.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Mineralogiczne
Tematy:
Nishikhal
manganese ore
lithiophorite
mineral chemistry
Opis:
Fine-grained aggregates of lithiophorite are associated with cryptomelane, romanèchite, birnessite and graphite in the Precambrian Eastern Ghats manganese ore deposit of Nishikhal, south Orissa, India. High-cobalt lithiophorite is reported for the first time from the manganese ores. The mode of occurrence and the chemical composition of the lithiophorite are discussed. Along with manganese and aluminium, the lithiophorite contains appreciable quantities of CoO (1.59-8.56%) together with trace amounts of Cu, Ni, Zn, Ti, Ca, Mg, Na, K and P. The Nishikhal lithiophorite is a transition metal-rich lithiophorite.
Źródło:
Mineralogia; 2010, 41, 1/2; 11--21
1899-8291
1899-8526
Pojawia się w:
Mineralogia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Fusion Characteristics of Ashes from Lignin and the Coke Breeze
Autorzy:
Fröhlichová, M.
Findorák, R.
Legemza, J.
Džupková, M.
Powiązania:
https://bibliotekanauki.pl/articles/352254.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
biomass
ash
fuel
mineral phases
iron ore sinter
Opis:
In this paper are presented results of study fusion characteristics of the biomass ashes from the hydrolyzed lignin and the ashes from the coke breeze. The hydrolyzed lignin ashes were compared with the coke breeze ashes i.e. with a fossil fuel. These ashes were prepared in muffle furnace at the temperature of 550°C (hydrolyzed lignin) and 850°C (coke breeze). Biomass (the hydrolyzed lignin) represents the new fuels for sintering process and an attractive way to decrease CO2 emissions from the energy production. The characterization methods were the following: standard fuel characterization analyses, chemical and mineralogical composition of the ashes and phase analyses of the ashes of biomass and the coke breeze. These ashes were prepared by the same method. Characterisation of the ashes samples was conducted by means of X-ray fluorescence (XRF), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Quantitative analysis of the crystalline and amorphous phases in each of the ash samples were carried out using the Rietveld method. The dominant phase of the ash from the coke breeze was mullite (Al6 Si2 O13 ). SiO2 is the dominant phase of the ash from the hydrolyzed lignin.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 3; 1523-1530
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ore Microscopy Characterization as a Mineral Processing Control
Mikroskopowa charakterystyka rudy jako kontrola przetwarzania minerału
Autorzy:
Tomanec, R.
Cablik, V.
Simovic, I.
Gacina, R.
Powiązania:
https://bibliotekanauki.pl/articles/318371.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
applied ore microscopy
copper ore
mineral liberation
mikroskopia rudy
rudy miedzi
minerały uwolnione
Opis:
The mineral deposit Bor-Cerovo is a relatively simple Cu-(Fe)ore that is becoming poorer and more complex in texture with the depth of mining. The Bor Copper Mine has expanded mine workings to the Cerovo field margins, where the same type of porphyry copper ore was found for which the Bor Mine is known as one of largest in Europe. Under the oxidized zone in the vertical deposit section lie paragenetic mineral associations typical of the cementated zone, or a transitional layer from the primary mineralized rock. Average concentrations of sulphide copper and oxide copper in the primary rock range from 0.263% to 0.164% and from 0.102% to 0.008%, respectively. Concentration of the ore of simple mineral composition has given a product of unsatisfactory both concentrate quality and metal recovery. More study is felt necessary of the structural/textural properties, of the identified mineral relations, and of the rate of mineral product liberation for the given grind fineness. Mineralogical analyses were conducted in the course of laboratory (and technological) tests. It has been learned that chemical analyses of the floatation concentrated material alone were inadequate, especially where complex texture of intergrowths and poor ore were involved. Structural properties and complex integrowths, and concequently low liberation degree, were found to be the reason of poor concentration. This paper discusses importance of the mineral liberation measurement for the technological results of copper ore concentration at the Bor-Cerovo flotation plant, and explains the functional relation between the mineral liberation and the grind fineness. Data on the microscopy of ore texture and the mineral liberation degree presented in this paper are aimed at improving the recovery and grade of chalcopyrite concentrate in the Veliki Krivelj Flotation Plant. Ore microscopy in the laboratory and technological tests indicate that chemical analysis as a tool for monitoring ore flotation is insufficient, especially where the processed ore is complex-textured and poor.
Złoże mineralne Bor-Cerovo jest stosunkowo prostą rudą Cu-(Fe), która staje się uboższa i bardziej złożona w teksturze wraz z głębokością wydobywania. Kopalnia miedzi Bor rozszerzyła prace wydobywcze do granic obszaru Cerovo gdzie znaleziono ten sam typ porfirowej rudy miedzi, z którego kopalnia Bor jest znana jako największa w Europie. Poniżej strefy utlenionej w pionowej strefie złoża znajduje się zespół paragenetycznego minerału typowego dla strefy cementacji, lub warstwa przejściowa ze skały pierwotnie zmineralizowanej. Średnie stężenie siarczanu miedzi i tlenku miedzi w skale pierwotnej znajduje się w przedziale kolejno od 0,263% do 0,164% oraz od 0,102% do 0,008%. Stężenie w rudzie niezłożonego minerału daje produkt niezadowalający pod względem zarówno jakości koncentratu jak i odzysku metalu. Koniecznych jest więcej badań na temat właściwości strukturalnych/tekstury, identyfikacji zależności minerału, oraz na temat stopnia wyzwalania produktu mineralnego dla danego stopnia rozdrobnienia. Przeprowadzono analizę mineralogiczną podczas badań laboratoryjnych (i technologicznych). Dowiedziano się, że analiza chemiczna i flotacja koncentratu mineralnego była nieadekwatna, szczególnie gdy zaangażowana była skomplikowana struktura narostów między ziarnami i uboga ruda. Odkryto, że właściwości strukturalne i skomplikowane narosty, a co za tym idzie niski stopień uwalniania, były powodem ubogiej koncentracji. Artykuł ten omawia znaczenie pomiarów uwalniania minerału dla wyników technologicznych koncentracji miedzi w rudzie w zakładzie flotacyjnym Bor-Cerovo, i wyjaśnia funkcjonalną zależność miedzi uwalnianiem minerału a stopniem rozdrobnienia. Dane mikroskopowe tekstury rudy i stopnia uwalniania minerału prezentowane w tym artykule mają na celu polepszenie odzyskiwania i stopnia koncentratu chalkopirytu w zakładzie flotacyjnym VelikiKrivelj. Laboratoryjne i technologiczne badania mikroskopowe rudy wykazują, że analiza chemiczna jako narzędzie monitorowania flotacji rudy jest niewystarczająca, szczególnie jeśli przetwarzana ruda ma skomplikowaną teksturę i jest uboga.
Źródło:
Inżynieria Mineralna; 2014, R. 15, nr 2, 2; 101-106
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studying on mineralogical and petrological characteristics of Gara Djebilet oolitic iron ore, Tindouf (Algeria)
Autorzy:
Chebel, Nassima
Nettour, Djamel
Chettibi, Mohamed
Rachid, Chaib
Khoshdast, Hamid
Hassanzadeh, Ahmad
Powiązania:
https://bibliotekanauki.pl/articles/29551591.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
oolitic iron ore
Gara Djebilet
mineralogical characterization
mineral processing
Opis:
Demand for iron ore worldwide has been steadily increasing which leads to the extraction of iron ore deposits with more complex mineralogies and higher levels of silicon and phosphorus impurities. This is the case in Algeria with the iron ore deposit of Gara Djebilet, Tindouf; where it has recently been exploited to ensure the sufficiency of iron ore required to produce iron and steel products. This deposit has remained unexploited for several decades due to inadequate knowledge of its mineralogy, treatment, and economic assessments. This study aims to find out the microstructure, chemical composition, and mineralogical distribution of valuable minerals and impurities, to understand the efficient processing methods for this specific iron ore. The characterization of representative ironstone samples taken from the studied area was carried out using optical microscopy, X-ray fluorescence spectrometer (XRF), petrographic microscope, X-ray diffractometer (XRD), and scanning electron microscope (SEM) coupled with energy dispersive X-ray spectroscopy (EDS). The results of the mineralogical analyses confirmed that it is an oolitic fine-grained ore consisting of gangue minerals principally composed of quartz, apatite, and iron-rich concentric cored structures. Chemical analyses of the ore indicated that it contains 56.58 wt% Fe with 7.98 wt% SiO2, 7.09 wt% Al2O3, and minor amounts of P2O5, CaO, MgO, and TiO2 compounds. The phosphorus associated was present in both ooids and groundmass, indicating that the ore has a complex texture with very rich and diverse mineralogy. For that, two conceptual scenarios were potentially proposed for processing the studied iron ore, while further detailed automated mineralogical information was required to make sure about the processing units from a practical perspective.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 5; art. no. 178382
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Froth flotation of Aljustrel sulphide complex ore
Autorzy:
Sousa, R.
Futuro, A.
Pires, C. S.
Leite, M. M.
Powiązania:
https://bibliotekanauki.pl/articles/109732.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
froth flotation
mineral liberation
flotation reagents
complex sulphide ore
Opis:
Froth flotation of copper-zinc-lead ores is a complex process based on similar metallurgy processing and strong interactions between chalcopyrite and sphalerite. These types of ores represent 15% of the world production and 7.5% of copper deposits all over the world. In the present study, an attempt is made to assess the feasibility of froth flotation of a complex sulphide ore, where the effect of liberation grade as well as depressant, collector and frother dosage was studied. Copper flotation is dependent on the mineral liberation grade, which is significantly related with the size distribution. It was shown that longer grinding time increased the Cu grade but decreased the copper recovery due to the presence of very fine particles. Lime and sodium metabisulphite, used as depressants, allowed to achieve a good flotation performance. It was shown that for this type of ore lower dosage of the collector should be applied. Finally, a higher frother dosage led to a greater selectivity and reduced entrainment of very fine particles, but also caused low kinetic ratio and low recovery of valuable minerals. A well-defined flotation objective was imperative for a good liberation grade and reagents dosage selection, mainly for complex sulphide ores. A useful contribute was given to a better technical understanding of flotation of a complex sulphide ore from the Moinho deposit.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 2; 758-769
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A rare indium-bearing mineral (Zn-In-Cu-Fe sulphide) from the Stara Kamienica Schist Belt (Sudetes, SW Poland)
Autorzy:
Małek, Rafał
Mikulski, Stanisław Z.
Powiązania:
https://bibliotekanauki.pl/articles/2058848.pdf
Data publikacji:
2021
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
indium mineral
sakuraiite group
sulphide-cassiterite ore
Sn deposit
Sudetes
Opis:
A rare indium-bearing mineral from the stratiform Czerniawa Zdrój-Krobica Sn deposit in the Sudetes (NE part of the Bohemian Massif) has been recognized in the qualitative-quantitative chemical composition studies of sulphide-cassiterite samples by electron microprobe (EMPA). This indium-bearing mineral occurs in the form of separate hipautomorphic microscopic grains (diameter 5–20 μm) and as intergrowths and disseminations in chalcopyrite. Observations indicate that this phase crystallized with the main generation of chalcopyrite, sphalerite and also with a younger generation of cassiterite in the mineral succession. The chemical composition of this mineral is as follows: S – 29.38–30.77 wt.%, Zn – 29.76–34.02 wt.%, In – 17.52–19.40 wt.%, Cu – 9.05–10.75 wt.%, Fe – 7.76–8.7 wt.% and Sn – 0.03–0.1 wt.%. Its calculated chemical formula is: (Zn2.09In0.67Cu0.65Fe0.64Cd0.02)∑=4.07 and it is characterized by enrichment of Zn with simultaneous depletion in Cu and Sn relative to the ideal chemical composition of sakuraiite – the most similar mineral in terms of chemical composition. In the light of our new data, it should be considered as a yet unnamed Zn-In-Cu-Fe sulphide mineral. In addition, coexisting sulphide minerals – chalcopyrite (max. 1580 ppm of In) and sphalerite (max. 1640 ppm of In) were identified as indium carriers.
Źródło:
Geological Quarterly; 2021, 65, 1; 7
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ore mineralization in the Miedzianka area (Karkonosze-Izera Massif, the Sudetes, Poland): new information
Autorzy:
Mochnacka, K.
Oberc-Dziedzic, T.
Mayer, W.
Pieczka, A.
Powiązania:
https://bibliotekanauki.pl/articles/2086527.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Mineralogiczne
Tematy:
Miedzianka
Ciechanowice
Przybkowice
Karkonosze-Izera Massif
ore deposits
mineral succession
geothermometry
Opis:
The Miedzianka mining district has been known for ages as a site of polymetallic ore deposits with copper and, later, uranium as the main commodities. Although recently uneconomic and hardly accessible, the Miedzianka ores attract Earth scientists due to the interesting and still controversial details of their ore structure, mineralogy and origin. Our examination of the ore mineralization from the Miedzianka district was based exclusively on samples collected from old mining dumps located in the vicinity of Miedzianka and Ciechanowice, and on samples from the only available outcrop in Przybkowice. In samples from the Miedzianka field, chalcopyrite, pyrite, galena, bornite, chalcocite, digenite, arsenopyrite, magnetite, sphalerite, tetrahedrite-tennantite, bornite, hematite, martite, pyrrhotite, ilmenite, cassiterite and covellite are hosted in quartz-mica schists and in coarse-grained quartz with chlorite. In the Ciechanowice field, the ore mineralization occurs mainly in strongly chloritized amphibolites occasionally intergrown with quartz and, rarely, with carbonates. Other host-rocks are quartz-chlorite schist and quartzites. Microscopic examination revealed the presence of chalcopyrite, pyrite, sphalerite, galena, tetrahedrite-tennantite, bismuthinite, native Bi, arsenopyrite, löllingite, cassiterite, cobaltite, gersdorffite, chalcocite, cassiterite, bornite, covellite, marcasite and pyrrhotite. Moreover, mawsonite and wittichenite were identified for the first time in the district. In barite veins cross-cutting the greenstones and greenschists in Przybkowice, we found previously-known chalcopyrite, chalcocite and galena. The composition of the hydrothermal fluids is suggested to evolved through a series of consecutive systems characterized, in turn, by Ti-Fe-Sn, Fe- As-S, Fe-Co-As-S, Cu-Zn-S and, finally, Cu-Pb-Sb-As-Bi compositions.
Źródło:
Mineralogia; 2012, 43, 3/4; 155--178
1899-8291
1899-8526
Pojawia się w:
Mineralogia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chondryt węglisty NWA 4446
Carbonaceous chondrite NWA 4446
Autorzy:
Przylibski, Tadeusz A.
Blutstein, Konrad
Łuszczek, Katarzyna
Gruchot, Joanna
Powiązania:
https://bibliotekanauki.pl/articles/2087069.pdf
Data publikacji:
2022
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
meteoryt
chondryt węglowy
chondryt CV3
Asteroida typu C
pas asteroid
Układ Słoneczny
ruda
meteorite
carbonaceous chondrite
CV3 chondrite
C-type asteroid
asteroid belt
Solar System
ore mineral
Opis:
The authors carried out petrographic, mineralogical, and chemical analyses (bulk chemical composition and microanalyses of mineral chemical composition) of NWA 4446 carbonaceous chondrite. NWA 4446 chondrite is classified as CV3, S2, W2. This meteorite is a rock fragment most likely from one of the C-type asteroids orbiting the Sun in the outer part of the asteroid belt. It represents the matter formed at the earliest stages of the formation of extrasola bodies in the solar system. As a result of the research, the authors documented a wider range of variation in the chemical composition of olivine crystals (Fa: 0.67-46.57 mol%) in the matrix and chondrules, and a much narrower range of variation in the chemical com- position of pyroxene crystals (Fs: 0.90–3.35 mol%) against the data used for the classification of the meteorite. The characteristics of the chondrules, ranging in size from 0.5 to more than 1 mm, allowed concluding that they constitute about 60% of the meteorite’s vol- ume, in which they form many structural and mineral varieties PO, POP, BO, PP and RP chondrules were observed. The remaining 40% of the chondrite volume is a matrix consisting of small crystals of pyroxenes, olivines, glass, as well as opaque minerals: sulphides, FeNi alloy, native copper and gold grains, carbonaceous substance, and compact CAIs. The mineral and chemical composi- tion of CAIs shows that their dominant mineral is melilite, accompanied by diopside and spinel. The chemical composition of spinel and diopside is very similar to their total chemical formulas, while the composition of melilite shows a significant sodium deficiency. Among the opaque minerals, one phase of the FeNi dominates - awaruite (Ni 3 Fe), and sulphides are represented by troilite (FeS) and mackinawite ((Fe,Ni) 9 S 8 ). Moreover, grains of native copper with an admixture of gold and grains of native gold with an admixture of platinum, nickel and copper with a size of several μm were identified. Taking into account the admixtures contained in the above-mentioned opaque minerals (mainly Co and Cu), the parent rock of the carbonaceous chondrite NWA 4446 can be considered to have been mineralized with Fe, Ni, Co and Cu ore minerals with the content of Au and Pt. This means that, we can expect deposits of native forms of the above-mentioned metals and sulphides on the parent bodies of carbonaceous chondrites of the CV group - C-type asteroids.
Źródło:
Przegląd Geologiczny; 2022, 70, 7; 513--526
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Halit w poziomie eksploatacyjnym złóż rud miedzi na monoklinie przedsudeckiej – przykład współczesnej mineralizacji chlorkowej
Halite in mine drifts in copper ore deposits over the Fore-Sudetic Homocline: an example of modern chloride mineralization
Autorzy:
Świerk, Mateusz
Burliga, Stanisław
Powiązania:
https://bibliotekanauki.pl/articles/2191997.pdf
Data publikacji:
2022
Wydawca:
Polskie Stowarzyszenie Górnictwa Solnego
Tematy:
halit
minerał chlorkowy
złoże rud miedzi
monoklina przedsudecka
halite
chloride mineral
copper ore
Fore Sudetic Homocline
Źródło:
Przegląd Solny; 2022, 16; 168--170
2300-9349
Pojawia się w:
Przegląd Solny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ore mineralization in the Miedzianka area (Karkonosze-Izera Massif, the Sudetes, Poland): new information
Autorzy:
Mochnacka, Ksenia
Oberc-Dziedzic, Teresa
Mayer, Wojciech
Pieczka, Adam
Powiązania:
https://bibliotekanauki.pl/articles/2086489.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Mineralogiczne
Tematy:
Miedzianka
Ciechanowice
Przybkowice
Karkonosze-Izera Massif
ore deposits
mineral succession
geothermometry
Opis:
The Miedzianka mining district has been known for ages as a site of polymetallic ore deposits with copper and, later, uranium as the main commodities. Although recently uneconomic and hardly accessible, the Miedzianka ores attract Earth scientists due to the interesting and still controversial details of their ore structure, mineralogy and origin. Our examination of the ore mineralization from the Miedzianka district was based exclusively on samples collected from old mining dumps located in the vicinity of Miedzianka and Ciechanowice, and on samples from the only available outcrop in Przybkowice. In samples from the Miedzianka field, chalcopyrite, pyrite, galena, bornite, chalcocite, digenite, arsenopyrite, magnetite, sphalerite, tetrahedrite-tennantite, bornite, hematite, martite, pyrrhotite, ilmenite, cassiterite and covellite are hosted in quartz-mica schists and in coarse-grained quartz with chlorite. In the Ciechanowice field, the ore mineralization occurs mainly in strongly chloritized amphibolites occasionally intergrown with quartz and, rarely, with carbonates. Other host-rocks are quartz-chlorite schist and quartzites. Microscopic examination revealed the presence of chalcopyrite, pyrite, sphalerite, galena, tetrahedrite-tennantite, bismuthinite, native Bi, arsenopyrite, löllingite, cassiterite, cobaltite, gersdorffite, chalcocite, cassiterite, bornite, covellite, marcasite and pyrrhotite. Moreover, mawsonite and wittichenite were identified for the first time in the district. In barite veins cross-cutting the greenstones and greenschists in Przybkowice, we found previously-known chalcopyrite, chalcocite and galena. The composition of the hydrothermal fluids is suggested to evolved through a series of consecutive systems characterized, in turn, by Ti-Fe-Sn, Fe- As-S, Fe-Co-As-S, Cu-Zn-S and, finally, Cu-Pb-Sb-As-Bi compositions.
Źródło:
Mineralogia; 2012, 43, 3/4; 155--178
1899-8291
1899-8526
Pojawia się w:
Mineralogia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of energies on the impact breakage characteristic of magnetite ores
Autorzy:
Si, Liang
Cao, Yijun
Li, Guosheng
Powiązania:
https://bibliotekanauki.pl/articles/2200336.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
fractal dimension
ore breakage characteristic
particle size distribution
mineral liberation
fracture morphology
Opis:
The energy applied during breakage is the key to enhancing the magnetite liberation degree and improving quality. The relationship between energy and liberation properties remains unclear due to various complicated factors affecting mineral liberation. Therefore, this work aims to study the effect of energy on the breakage characteristics of magnetite ores; the impact breakage test was conducted on magnetite particle groups at different energies using a drop weight impact tester; the statistical analysis was performed based on the fractal theory to research the particle size distribution; the fracture morphology and liberation properties of these ores were analyzed using scanning electron microscope and mineral liberation analyzer. Results show that the particle size distribution of magnetite after breakage conforms to the fractal law. The larger the energy, the greater the fractal dimension for this distribution, showing a linear relation between them, which implies that the fractal dimension can evaluate the breakage degree. The fracture morphology of magnetite ores indicates that as the energy increases, the intergranular fracture evolves into transgranular fracture, proving the influence of energy on fracture modes. It is found that the magnetite liberation degree first increases and then decreases with the rising of energy, indicating that the magnetite liberation can be improved at an appropriate amount of energy. The above conclusions provide a theoretical reference for optimizing energy and improving broken product quality.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 1; art. no. 159098
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Qualitative description of metal ore deposits parameters based on selected fuzzy logic operators on the example of a KGHM Polish Copper S.A. copper-silver mine
Jakościowy opis parametrów złoża rud metali w oparciu o wybrane operatory logiczne zbiorów rozmytych na przykładzie kopalni rud miedziowo-srebrowych w KGHM „Polska Miedź” S.A.
Autorzy:
Krzak, Mariusz
Panajew, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/219818.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ruda miedzi
jakość złoża
zbiory rozmyte
operator logiczny
ore deposit parameters
mineral deposit management
fuzzy sets
logical operators
Opis:
The basis for a mineral deposit delimitation is a qualitative and quantitative assessment of deposit parameters, qualifying a deposit as an economically valuable object. A conventional approach to the mineral deposit recognition and a deposit detailed parameters qualification in the initial stages of develop-ment work in the KGHM were presented in the paper. The goals of such recognition were defined, which through a gradual detailed expansion, resulting from the information inflow, allows for the construction of a more complete decision-making model. The description of the deposit parameters proposed in the article in the context of fuzzy logic, enables a presentation of imprecise statements and data, which may be a complement to a traditional description. Selected non-adjustable and adjustable s-norm and t-norm operators were demonstrated. Operators effects were tested for selected ore quality parameters (copper content and deposit thickness) by constructing adequate membership functions. In a practical application, the use of chosen fuzzy logic operators is proposed for the assessment of the qualitative parameters of copper-silver ore in the exploitation blocks for one of the mines belonging to KGHM Polish Copper S.A. The considerations have been extended by including the possibility of using compensation operators.
Podstawą delimitowania złoża jest ocena parametrów jakościowych oraz ilościowych, kwalifikująca twór przyrodniczy jako obiekt o znaczeniu gospodarczym. W artykule przybliżono konwencjonalne podejście do rozpoznania serii złożowej i szczegółowych parametrów złoża, realizowane w kopalniach KGHM Polska Miedź S.A. w trakcie wykonywania tzw. robót przygotowawczych. Określono celowośćtakiego rozpoznania, które poprzez stopniowe uszczegółowianie, wynikające z napływu informacji, pozwala na konstrukcję bardziej kompletnego modelu decyzyjnego. Dopełnieniem tego tradycyjnego opisu może być zaproponowana w artykule deskrypcja parametrów złoża w ujęciu logiki rozmytej, umożliwiająca przedstawienie nieprecyzyjnych stwierdzeń i danych. Zademonstrowano wykorzystanie nastawialnych i nienastawialnych operatorów mnogościowych s-normy i t-normy a działanie operatorów przetestowano dla wybranych parametrów jakościowych rudy (zawartości miedzi oraz miąższości złoża) konstruując adekwatne funkcje przynależności. W praktycznym zastosowaniu przetestowano wybrane operatory logiki rozmytej do oceny parametrów jakościowych złoża rud miedziowo-srebrowych w blokach eksploatacyjnych dla jednej z kopalń KGHM Polska Miedź S.A. Rozważania poszerzono o możliwośćzastosowania operatorów kompensacyjnych.
Źródło:
Archives of Mining Sciences; 2019, 64, 2; 261-277
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 23

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