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Journal articles on the topic 'Gibbsite Scale'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Golubev, Vladimir, and Tatyana Litvinova. "Dynamic simulation of industrial-scale gibbsite crystallization circuit." Journal of Mining Institute 247 (March 16, 2021): 88–101. http://dx.doi.org/10.31897/pmi.2021.1.10.

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Population balance model is crucial for improving the method of aluminum hydroxide massive crystallization and enhancing the quality of control over industrial precipitation trains. This paper presents the updated population balance model, which can be used for simulation of industrial-scale precipitation. Processes of birth-and-spread and particle breakage are considered integral parts of the precipitation process along with secondary nucleation, growth and agglomeration of particles. The conceptual difference of the proposed system of equations is its ability to reproduce the oscillatory pro

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2

Bekker, A. V., T. S. Li, and I. Livk. "Dynamic response of a plant-scale gibbsite precipitation circuit." Hydrometallurgy 170 (July 2017): 24–33. http://dx.doi.org/10.1016/j.hydromet.2016.06.002.

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3

Webster, Nathan A. S., Ian C. Madsen, Melissa J. Loan, et al. "An investigation of goethite-seeded Al(OH)3precipitation usingin situX-ray diffraction and Rietveld-based quantitative phase analysis." Journal of Applied Crystallography 43, no. 3 (2010): 466–72. http://dx.doi.org/10.1107/s0021889810008484.

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Anin situX-ray diffraction investigation of goethite-seeded Al(OH)3precipitation from synthetic Bayer liquor at 343 K has been performed. The presence of iron oxides and oxyhydroxides in the Bayer process has implications for alumina reversion, which causes significant process losses through unwanted gibbsite precipitation, and is also relevant for the nucleation and growth of scale on mild steel process equipment. The gibbsite, bayerite and nordstrandite polymorphs of Al(OH)3precipitated from the liquor; gibbsite appeared to precipitate first, with subsequent formation of bayerite and nordstr

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4

Hai, Chunxi, Yuan Zhou, Lijuan Zhang, et al. "Large-scale synthesis of uniformly dispersed hexagram-like gibbsite by a controlled replacement reaction." CrystEngComm 19, no. 27 (2017): 3850–55. http://dx.doi.org/10.1039/c7ce00822h.

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A facile, convenient and mild method has been developed for synthesis of uniformly dispersed 2D six-pointed star-like gibbsite micro-nano crystals with lateral size around 2.5 μm and thickness around 100 nm.

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5

Enright, E., T. Curtin, J. Haines, and K. T. Stanton. "The influence of surface roughness on gibbsite scale development on steel." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 226, no. 1 (2011): 61–71. http://dx.doi.org/10.1177/1464420711421269.

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6

Fernandes, Kathleen, José Marques Júnior, Angélica Santos Rabelo de Souza Bahia, José A. M. Demattê, and Adriana Aparecida Ribon. "Landscape-scale spatial variability of kaolinite-gibbsite ratio in tropical soils detected by diffuse reflectance spectroscopy." CATENA 195 (December 2020): 104795. http://dx.doi.org/10.1016/j.catena.2020.104795.

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7

Kiani, Sajad, Abdolreza Samimi та Alimorad Rashidi. "Novel one-pot dry method for large-scale production of nano γ-Al2O3 from gibbsite under dry conditions". Monatshefte für Chemie - Chemical Monthly 147, № 7 (2016): 1153–59. http://dx.doi.org/10.1007/s00706-015-1642-1.

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8

Reatto, Adriana, Ary Bruand, Eder de Souza Martins, et al. "Variation of the kaolinite and gibbsite content at regional and local scale in Latosols of the Brazilian Central Plateau." Comptes Rendus Geoscience 340, no. 11 (2008): 741–48. http://dx.doi.org/10.1016/j.crte.2008.07.006.

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9

Dong, Jie Ji, Guang Wang, Mao Fang Zuo, Hua Li, and Qing Guo Xue. "Characteristics of the Sierra Leone High Alumina Iron Ore and Utilization in Sintering." Advanced Materials Research 881-883 (January 2014): 1515–21. http://dx.doi.org/10.4028/www.scientific.net/amr.881-883.1515.

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The characteristics of the Sierra Leone iron ore were studied at laboratory scale by chemical analysis, XRD, SEM-EDS and TG-DSC methods. The Sierra Leone iron ore was a kind of limonite, which was mainly consisted of hematite, goethite and gibbsite. The iron ore lost its crystal water at a fast speed ranging from 200°C to 400°C and the total content of the crystal water was about 8.2 wt.%. The initial melt formation temperature of the iron ore with CaO was stably kept at around 1209°C and the amount of liquid increased with the increasing of CaO content. Its melt formation temperature is highe

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10

Aristide Zé, Parfait, Cornelius Tsamo, and Richard Kamga. "Characterization of Minim-Martap Bauxite and Its Extracted Alumina." Journal of Advanced Chemical Sciences 4, no. 4 (2018): 598–600. http://dx.doi.org/10.30799/jacs.198.18040402.

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Due to their chemical and mineralogical properties bauxites are composites with multiple applications. In this work, the properties of bauxite collected from Minim-Martap and its extracted alumina were evaluated. Alumina was extracted by adapting the Bayer process at laboratory scale while the characteristics of bauxite and alumina were variably characterized by determining the particle size distribution, relative humidity, loss on ignition, pH, EC, CEC, PZC, XRD, IR, and DSC-TGA. These results show that Minim-Martap bauxite gray bauxite with easily extractable alumina. This bauxite is acidic

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11

Mugele, Frieder, Igor Siretanu, Naveen Kumar, et al. "Insights From Ion Adsorption and Contact-Angle Alteration at Mineral Surfaces for Low-Salinity Waterflooding." SPE Journal 21, no. 04 (2016): 1204–13. http://dx.doi.org/10.2118/169143-pa.

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Summary Most solid surfaces acquire a finite surface charge after exposure to aqueous environments caused by desorption and/or adsorption of ionic species. The resulting electrostatic forces play a crucial role in many fields of science and technology, including colloidal stability, self-assembly, wetting, and biophysics. Enhanced oil recovery (EOR) is an example of a large-scale industrial process that hinges in many respects on these phenomena. In this paper, we present a series of experiments illustrating fundamental aspects of low-salinity waterflooding in well-defined model systems. We sh

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12

Grotto, Francesco, and Umberto Pappalettera. "Equilibrium statistical mechanics of barotropic quasi-geostrophic equations." Infinite Dimensional Analysis, Quantum Probability and Related Topics 24, no. 01 (2021): 2150007. http://dx.doi.org/10.1142/s0219025721500077.

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We consider equations describing a barotropic inviscid flow in a channel with topography effects and beta-plane approximation of Coriolis force, in which a large-scale mean flow interacts with smaller scales. Gibbsian measures associated to the first integrals energy and enstrophy are Gaussian measures supported by distributional spaces. We define a suitable weak formulation for barotropic equations, and prove existence of a solution preserving Gibbsian measures, thus providing a rigorous infinite-dimensional framework for the equilibrium statistical mechanics of the model.

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13

Krakauer, Bruce W., and David N. Seidman. "Absolute atomic-scale measurements of the Gibbsian interfacial excess of solute at internal interfaces." Physical Review B 48, no. 9 (1993): 6724–27. http://dx.doi.org/10.1103/physrevb.48.6724.

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14

Rüsing, Järg, Jason T. Sebastian, Olof C. Hellman, and David N. Seidman. "Three-dimensional Investigation of Ceramic/Metal Heterophase Interfaces by Atom-probe Microscopy." Microscopy and Microanalysis 6, no. 5 (2000): 445–51. http://dx.doi.org/10.1007/s100050010050.

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AbstractThe results of a three-dimensional atom probe (3DAP) analysis, on a subnanometer scale, of a ceramic/metal heterophase interface, MgO/Cu, are presented. Segregation of Ag, from the Cu (Ag) matrix, at MgO/Cu interfaces is investigated and the Gibbsian interfacial excess of silver is determined; the range is 2.33 × 1018 to 5.81 × 1018 m−2. Also, silver segregation at the same MgO/Cu interfaces is analyzed employing a new approach that utilizes a proximity histogram or proxigram.

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15

Merkl, Franz. "Quenched asymptotics of the ground state energy of random Schrödinger operators with scaled Gibbsian potentials." Probability Theory and Related Fields 126, no. 3 (2003): 307–38. http://dx.doi.org/10.1007/s00440-003-0266-2.

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16

Isheim, Dieter, Olof C. Hellman, David N. Seidman, Frédéric Danoix, Alain Bostel, and Didier Blavette. "Atomic-scale Study of a Transition Phase Precipitate and Its Interfacial Chemistry in an Fe−15 at.% Mo−5 at.% V Alloy." Microscopy and Microanalysis 7, no. 5 (2001): 424–34. http://dx.doi.org/10.1007/s10005-001-0017-z.

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AbstractA Mo-rich precipitate in an Fe-rich matrix and the heterophase interface bounding the precipitate have been examined on an atomic scale by three-dimensional atom-probe (3DAP) microscopy and transmission electron microscopy (TEM). The Mo-rich precipitate was generated by isothermal solid-state decomposition at 500°C of an Fe-15 at.% Mo-5 at.% V alloy. After this heat treatment, TEM reveals a characteristic modulated strain contrast structure. The precipitate has a composition of Mo-13.0 at.% Fe-4.9 at.% V as measured by 3DAP microscopy. The alloy decomposes at a nearly constant 5 at.% V

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17

Krakauer, B. W., and David N. Seidman. "Absolute Atomic Scale Measurements of the Gibbsian Interfacial Excess of Solute at Grain Boundaries in an Iron (Silicon) Alloy." Materials Science Forum 155-156 (May 1994): 393–96. http://dx.doi.org/10.4028/www.scientific.net/msf.155-156.393.

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18

Williams, D. B., and A. D. Romig. "Measurement of solute segregation to grain boundaries in the AEM: A review." Proceedings, annual meeting, Electron Microscopy Society of America 46 (1988): 606–7. http://dx.doi.org/10.1017/s0424820100105096.

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The segregation of solute or imparity elements to grain boundaries can occur by three well-defined processes. The first is Gibbsian segregation in which an element of minimal matrix solubility confines itself to a monolayer at the grain boundary. Classical examples include Bi in Cu and S or P in Fe. The second process involves the depletion of excess matrix solute by volume diffusion to the boundary. In the boundary, the solute atoms diffuse rapidly to precipitates, causing them to grow by the ‘collector-plate mechanism.’ Such grain boundary diffusion is thought to initiate “Diffusion-Induced

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19

Kuśmierz, Łukasz, Bartłomiej Dybiec, and Ewa Gudowska-Nowak. "Thermodynamics of Superdiffusion Generated by Lévy–Wiener Fluctuating Forces." Entropy 20, no. 9 (2018): 658. http://dx.doi.org/10.3390/e20090658.

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Scale free Lévy motion is a generalized analogue of the Wiener process. Its time derivative extends the notion of “white noise” to non-Gaussian noise sources, and as such, it has been widely used to model natural signal variations described by an overdamped Langevin stochastic differential equation. Here, we consider the dynamics of an archetypal model: a Brownian-like particle is driven by external forces, and noise is represented by uncorrelated Lévy fluctuations. An unperturbed system of that form eventually attains a steady state which is uniquely determined by the set of parameter values.

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20

Rogankov, V., M. Shvets, and O. Rogankov. "New Non-Stationary Gradient Model of Heat-Mass-Electric Charge Transfer in Thin Porous Media." Refrigeration Engineering and Technology 53, no. 5 (2017): 33–46. http://dx.doi.org/10.15673/ret.v53i5.850.

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The well-known complicated system of non-equilibrium balance equations for a continuous fluid (f) medium needs the new non-Gibbsian model of f-phase to be applicable for description of the heterogeneous porous media (PMs). It should be supplemented by the respective coupled thermal and caloric equations of state (EOS) developed specially for PMs to become adequate and solvable for the irreversible transport f-processes. The set of standard assumptions adopted by the linear (or quasi-linear) non-equilibrium thermodynamics are based on the empirical gradient-caused correlations between flows and

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21

Thiry, Médard, Florence Quesnel, Johan Yans, et al. "Continental France and Belgium during the early Cretaceous: paleoweatherings and paleolandforms." Bulletin de la Société Géologique de France 177, no. 3 (2006): 155–75. http://dx.doi.org/10.2113/gssgfbull.177.3.155.

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Abstract During the early Cretaceous, successive tectonic phases and several sea level falls resulted in the emersion of the main part of western Europe and the development of thick “lateritic” weathering. This long period of continental evolution ended with the Upper Cretaceous transgressions. During this period, the exposed lands displayed a mosaic of diverse morphologies and weathered landscapes. Bauxites are the most spectacular paleoweathering features, known for long in southern France. Recently, new residual outcrops have been identified, trapped in the karstic depressions of the Grands

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22

Trotignon, L., H. Peycelon, M. Cranga, and F. Adenot. "Modelling of the Interaction Between an Engineered Clay Barrier and Concrete Structures in a Deep Storage Vault." MRS Proceedings 556 (1999). http://dx.doi.org/10.1557/proc-556-607.

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AbstractThe degradation of concrete structures in a storage vault will release an alkaline plume influencing the geochemical evolution of clay engineered barriers or plugs. The studied configuration has a representative scale and is composed of a rectangular clay barrier interfaced on one side with a cement block and on the other side with an external granitic field. A clay model including major and accessory minerals is used; cement material is supposed to be made of portlandite and CSH minerals. The clay barrier and the cement block are assumed to be initially saturated and in equilibrium wi

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