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    Wyświetlanie 1-6 z 6
    Tytuł:
    Characterization and beneficiation of iranian low-grade manganese ore
    Autorzy:
    Mehdilo, A.
    Irannajad, M.
    Hojjati-Rad, M. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/110939.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    pyrolusite
    manganese ore
    ore characterization
    gravity separation
    magnetic separation
    Opis:
    The mineralogical studies indicated that the Charagah ore deposit contains approximately 17% pyrolusite, 78% calcite and 3–4% quartz. Pyrolusite as a main valuable mineral is found in the forms of coarse and fine pyrolusites. The coarse grains pyrolusite with simple texture is liberated at 180 micrometers. Another kind of pyrolusite with particle size finer than 10 m is disseminated inside gangue phases. This kind of pyrolusite has important effect in beneficiation processes and can affect the manganese grade of the concentrate and its recovery negatively. By jigging machine a pre-concentrate with 20% MnO and a final tailing with about 13% manganese loss are obtained. Using tabling technique or wet high intensity magnetic separation (WHIMS) and also their combination with jigging machine, production of a final pyrolusite concentrate with suitable grade but average recovery is possible. By jigging-tabling a concentrate with – 500+45 m size fraction, 44.3% MnO and 61.3% recovery is obtained while jigging-WHIMS produces a concentrate containing 52.6% MnO with a recovery up to 56.6% and d80 = 180 m.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2013, 49, 2; 725-741
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selective leaching of copper from near infrared sensor-based preconcentrated copper ores
    Autorzy:
    Ambo, Amos Idzi
    Iyakwari, Shekwonyadu
    Glass, Hylke J
    Powiązania:
    https://bibliotekanauki.pl/articles/1449474.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    near infrared
    leaching
    pre-concentration
    ore characterization
    copper
    Opis:
    Copper oxide ore was pre-concentrated using near infrared sensor-based method and classified as product, middling and waste. The product and middling fractions were leached with ammonium chloride reagent. The effect of temperature, ammonium chloride concentration, solid- liquid ratio, stirring speed and particle size experimental variables were investigated. Mineralogical and chemical analysis of the ore fractions indicated that copper content was in accordance with the preconcentration strategy, with the product having a higher concentration than the middling and waste. The rate of copper extraction was found to be higher in the product than in the middling sample which further supports the near infrared classification, QEMSCAN®, X-ray diffraction, SEM mineralogical and X-ray florescence and Inductively coupled plasma Mass spectrometry chemical data. It was revealed that the leaching rate increases with increasing ammonium chloride concentration, temperature and decreasing ore particle size, stirring speed and solid-liquid ratio. Analysis of the experimental data by shrinking core model indicated that the dissolution kinetics follow the heterogeneous reaction model for the chemical control mechanism where the activation energies of 45.9 kJ/mol and 47.5 kJ/mol for product and middling fractions respectively were obtained. Characterization of the residue obtained at optimum leaching condition with X-ray diffraction suggests that copper was selectively leached when compared to the profile of the raw ore. The trace levels of metals associated with abundant X-ray diffraction profiles of residue found in the leachate further confirm the selective leaching process.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2020, 56, 1; 204-218
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bond´s work index estimation using non-standard ball mills
    Autorzy:
    Arellano-Piña, Ramón
    Sanchez-Ramirez, Elvia Angélica
    Pérez-Garibay, Roberto
    Gutiérrez-Pérez, V.H.
    Powiązania:
    https://bibliotekanauki.pl/articles/27323664.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    Bond´s Work Index
    rocks grinding
    laboratory scale ball mills
    ore characterization
    non-standard ball mills
    Opis:
    Ore concentrators seek the stability of processes by feeding blends of rocks with average hardness and ore content. Therefore, large amounts of samples must be characterized in a short time. The Bond Work Index () is a common technique for the estimation of hardness and energy requirement for comminution using ball mills. However, this technique is time-consuming (close to 5 hours) and liable to experimental errors. This work contributes to obtaining new models for rapid Bond Work Index estimation using non-standard dimensions mills. This was done by proposing grinding tests using four types of ores and four mills of different dimensions, including the standard Bond ball mill (BBM). For all tests it was kept constant: (a) critical speed (91%), and (b) mill charge by volume (10.5%), varying the amount of fresh feed according to its density. The results showed that using the non-standard mills (between 20 and 35 cm in diameter), the Bond´s model constants (=0.23; = 0.82, and = 44.5), are unable to predict the Work Index properly. Therefore, these constants must be recalculated using linear models based on mill diameter. With the models proposed for , , and , the Bond Work Index (kWh/t) can be rapidly estimated (less than 2 hours) and show a high accuracy for mills of non-standard dimensions (R2= 0.96).
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 6; art. no. 172458
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    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:
    Leaching of manganese ores using corncob as reductant in H2SO4 solution
    Autorzy:
    Ali, S.
    Iqbal, Y.
    Farooq, U.
    Ahmad, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/110165.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    siliceous manganese ore
    characterization
    leaching
    corncob
    H2SO4
    Opis:
    In this study, corncob was used as reductant for sulfuric acid leaching of manganese ore from Daweezi, Upper Mohmand Agency, Pakistan. X-ray diffraction of representative powdered samples revealed the presence of manganese silicate MnSiO(SiO4), calcite (CaCO3), and -quartz (SiO2). X-ray diffraction and energy dispersive spectroscopy analyses indicated that the examined manganese ore was siliceous in nature. Three process parameters were investigated in the present study including the particle size of the ore, leaching temperature, and amount of corncob. Manganese extraction of 92.48 wt% was achieved for a leaching time of 60 min at 90 oC using 1.9 mol/dm3 H2SO4 concentration and 4 g of corncob. The present results demonstrated that corncob is a low cost, renewable, and non-hazardous reducing agent for manganese leaching under mild acid conditions in comparison to the other available reagents.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2016, 52, 1; 56-65
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quantifying Mineral Liberation – A Conventional and New Automatic Sophisticated Techniques Approach
    Ocena uwolnienia minerałów – podejście konwencjonalne i nowe techniki automatyczne
    Autorzy:
    Tomanec, Rudolf
    Blagojev, Marina
    Powiązania:
    https://bibliotekanauki.pl/articles/317860.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    mineral liberation
    free surface area
    texture characterization
    prediction
    ore microscopy
    uwolnienie minerałów
    pole powierzchni wolnej
    charakterystyka tekstury
    prognoza
    mikroskopia rudy
    Opis:
    The characterization of textural properties of minerals is closely related to the process of their respective liberation. Measurements of mineral liberation, related to grinded ore, can be performed using optical ore microscope, by conventional, classical methods – point counting, linear intercepts method or planimetric measurements method (2D). Modern automatic devices and sophisticated measurement techniques (QEMSCAN/MLA) imply recording free surfaces area of mineral grains on polished sections samples in order to determine mineral degree of liberation. Value of mineral liberation obtained over free surfaces area can be of interest to flotation concentration, although not for gravity separation or, for example, magnetic separation. The prediction accuracy for behavior of one feed ore during the concentration process depends on the method of measuring/recording mineral liberation. Considering raw materials with complex textural characteristics it is crucial which method will be applied for determination of mineral liberation respecting whether for concentration process is crucial physical or chemical method.
    Charakterystyka właściwości tekstury minerałów jest blisko związana z procesem ich uwolnienia. Pomiary uwolnienia minerałów powiązane są z mieleniem rudy i mogą być wykonane za pomocą mikroskopu optycznego przy zastosowaniu konwencjonalnych metod – liczenia punktów, metody linii przecięcia albo metody pomiarów planimetrycznych (2D). Nowoczesne urządzenia automatyczne, jak również wyrafinowane techniki pomiarowe (QEMSCAN/MLA) stosują pomiar pól powierzchni wolnych ziaren minerału na próbkach wypolerowanych przekrojów w celu określenia stopnia uwolnienia minerałów. Wartość tego uwolnienia otrzymana na podstawie pola powierzchni wolnej może być przedmiotem zainteresowania w kontekście prowadzenia procesu flotacji, aczkolwiek nie w przypadku wzbogacania grawitacyjnego, czy magnetycznego. Prawidłowość prognozy odnośnie zachowania rudy podczas procesu zależy od metody oceny uwolnienia minerałów. Biorąc pod uwagę surowce o skomplikowanej teksturze bardzo ważnym jest, którą metodę zastosuje się w celu określenia stopnia uwolnienia minerałów pamiętając także o tym, czy dany proces jest oparty o metody fizyczne, czy też chemiczne.
    Źródło:
    Inżynieria Mineralna; 2020, 2, 1; 211-215
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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