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Heavy mineral sands in the eucla basin, Southern Australia / Baohong Hou in Economic geology, Vol. 106 N° 4 (Juin/Juillet 2011) 

Public ISBD [article]  in Economic geology > Vol. 106 N° 4 (Juin/Juillet 2011) . - pp. 687-712 Titre : Heavy mineral sands in the eucla basin, Southern Australia : deposition and province-scale prospectivity Type de document : texte imprimé Auteurs : Baohong Hou, Auteur ; John Keeling, Auteur ; Anthony Reid, Auteur Année de publication : 2011 Article en page(s) : pp. 687-712 Note générale : Géologie économique Langues : Anglais (eng) Mots-clés : Heavy  mineral  sands  Australia Index. décimale : 553 Géologie économique. Minérographie. Minéraux. Formation et gisements de minerais Résumé : The marine Eucla basin in southern Australia is emerging as a major new heavy minerals province in Australia. Beach placers are associated with a series of partially buried Cenozoic coastal barrier sands formed along an arcuate 2,000-km-long basin margin, the trace of which is up to 320 km inland of the present coastline. The presence of high-grade deposits with dominant zircon over ilmenite and lesser amounts of rutile and leucoxene was established with the discovery of the Jacinth and Ambrosia heavy mineral deposits in late 2004. An additional 10 heavy mineral prospects were subsequently identified and are at various stages of evaluation. The Eucla basin and its adjacent paleovalley system have a large areal extent that contains a complicated succession of marine and nonmarine strata spanning a wide range of depositional environments. Four distinct constructional phases for the development of shorelines can be recognized and correlated with major third-order sea-level events, established by others from the marine depositional record as occurring during the middle Eocene (~42.5 Ma), late middle Eocene (39–36 Ma), late Eocene (36–34 Ma), and Miocene-Pliocene (15–2.6 Ma). Prevailing westerly winds built extensive dune systems by longshore drift. Sediment movement was from west to east. Detrital zircon rocks from the Ooldea and Barton barriers show a distribution of zircon age that is consistent with the Proterozoic Musgrave province to the north of the basin as the dominant primary source area of the heavy minerals, with a contribution from the Albany Fraser orogen to the west. The likelihood is that these heavy minerals have been recycled via sedimentary basins that flank the Musgrave province and include the Neoproterozoic to Cambrian Officer basin and Permian to Mesozoic deposits of the Bight basin. Our current depositional model is summarized as follows: (1) initial rapid transgression and deposition of a shallow marine sand sheet subsequently overlain by shallow marine limestone during middle Eocene; (2) a major Eocene transgression and deposition of a shelf, barrier, and lagoonal shoreface marine complex during the late middle Eocene; ( 3) further transgression and highstand deposition during the late Eocene; (4) renewed transgression of barrier, lagoonal, and possibly flooding deltaic sand blanket in the southeastern coastal plain with neotectonic uplift tilting in the western Eucla margin during Mio-Pliocene time. Each stage of reworking increased the potential for heavy mineral concentration in placer deposits. DEWEY : 553 ISSN : 0361-0128 En ligne : http://econgeol.geoscienceworld.org/content/106/4/687.abstract [article] Heavy mineral sands in the eucla basin, Southern Australia : deposition and province-scale prospectivity [texte imprimé] / Baohong Hou, Auteur ; John Keeling, Auteur ; Anthony Reid, Auteur . - 2011 . - pp. 687-712. Géologie économique Langues : Anglais (eng) in Economic geology > Vol. 106 N° 4 (Juin/Juillet 2011) . - pp. 687-712 Mots-clés : Heavy  mineral  sands  Australia Index. décimale : 553 Géologie économique. Minérographie. Minéraux. Formation et gisements de minerais Résumé : The marine Eucla basin in southern Australia is emerging as a major new heavy minerals province in Australia. Beach placers are associated with a series of partially buried Cenozoic coastal barrier sands formed along an arcuate 2,000-km-long basin margin, the trace of which is up to 320 km inland of the present coastline. The presence of high-grade deposits with dominant zircon over ilmenite and lesser amounts of rutile and leucoxene was established with the discovery of the Jacinth and Ambrosia heavy mineral deposits in late 2004. An additional 10 heavy mineral prospects were subsequently identified and are at various stages of evaluation. The Eucla basin and its adjacent paleovalley system have a large areal extent that contains a complicated succession of marine and nonmarine strata spanning a wide range of depositional environments. Four distinct constructional phases for the development of shorelines can be recognized and correlated with major third-order sea-level events, established by others from the marine depositional record as occurring during the middle Eocene (~42.5 Ma), late middle Eocene (39–36 Ma), late Eocene (36–34 Ma), and Miocene-Pliocene (15–2.6 Ma). Prevailing westerly winds built extensive dune systems by longshore drift. Sediment movement was from west to east. Detrital zircon rocks from the Ooldea and Barton barriers show a distribution of zircon age that is consistent with the Proterozoic Musgrave province to the north of the basin as the dominant primary source area of the heavy minerals, with a contribution from the Albany Fraser orogen to the west. The likelihood is that these heavy minerals have been recycled via sedimentary basins that flank the Musgrave province and include the Neoproterozoic to Cambrian Officer basin and Permian to Mesozoic deposits of the Bight basin. Our current depositional model is summarized as follows: (1) initial rapid transgression and deposition of a shallow marine sand sheet subsequently overlain by shallow marine limestone during middle Eocene; (2) a major Eocene transgression and deposition of a shelf, barrier, and lagoonal shoreface marine complex during the late middle Eocene; ( 3) further transgression and highstand deposition during the late Eocene; (4) renewed transgression of barrier, lagoonal, and possibly flooding deltaic sand blanket in the southeastern coastal plain with neotectonic uplift tilting in the western Eucla margin during Mio-Pliocene time. Each stage of reworking increased the potential for heavy mineral concentration in placer deposits. DEWEY : 553 ISSN : 0361-0128 En ligne : http://econgeol.geoscienceworld.org/content/106/4/687.abstract

Kinetics study on the liquid entrapment and melt transport of static and falling - film melt crystallization / Xiaobin Jiang in Industrial & engineering chemistry research, Vol. 51 N° 13 (Avril 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 13 (Avril 2012) . - pp. 5037-5044 Titre : Kinetics study on the liquid entrapment and melt transport of static and falling - film melt crystallization Type de document : texte imprimé Auteurs : Xiaobin Jiang, Auteur ; Baohong Hou, Auteur ; Yingying Zhao, Auteur Année de publication : 2012 Article en page(s) : pp. 5037-5044 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Melt  crystallization  Falling  film  Transport  process  Kinetics Résumé : Experiments were carried out to study the kinetics of crystal growth and the sweating process in two kinds of melt crystallization modes: static melt crystallization (SMC) and falling-film melt crystallization (FFMC). The system utilized in this paper was hyperpure phosphoric acid with water and trace amounts of metal ions as impurities. The kinetic experimental data of crystal growth, liquid entrapment, and the melt-transport process were well fitted by power function equations (R2 > 0.947). The fractal and porous media theories were introduced to improve the model of melt transport and explain the difference between the two modes. The separation efficiencies of SMC and FFMC on different ion impurities were compared. The SMC mode separated calcium and ferrum ions with higher efficiency than the FFMC mode, while the FFMC mode separated sodium and magnesium ions better than the SMC mode. A combined operation mode was suggested to prepare hyperpure phosphoric acid in industrial applications. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25777943 [article] Kinetics study on the liquid entrapment and melt transport of static and falling - film melt crystallization [texte imprimé] / Xiaobin Jiang, Auteur ; Baohong Hou, Auteur ; Yingying Zhao, Auteur . - 2012 . - pp. 5037-5044. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 13 (Avril 2012) . - pp. 5037-5044 Mots-clés : Melt  crystallization  Falling  film  Transport  process  Kinetics Résumé : Experiments were carried out to study the kinetics of crystal growth and the sweating process in two kinds of melt crystallization modes: static melt crystallization (SMC) and falling-film melt crystallization (FFMC). The system utilized in this paper was hyperpure phosphoric acid with water and trace amounts of metal ions as impurities. The kinetic experimental data of crystal growth, liquid entrapment, and the melt-transport process were well fitted by power function equations (R2 > 0.947). The fractal and porous media theories were introduced to improve the model of melt transport and explain the difference between the two modes. The separation efficiencies of SMC and FFMC on different ion impurities were compared. The SMC mode separated calcium and ferrum ions with higher efficiency than the FFMC mode, while the FFMC mode separated sodium and magnesium ions better than the SMC mode. A combined operation mode was suggested to prepare hyperpure phosphoric acid in industrial applications. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25777943

Model to simulate the structure of a crystal pillar and optimize the separation efficiency in melt crystallization by fractal theory and technique / Xiaobin Jiang in Industrial & engineering chemistry research, Vol. 50 N° 17 (Septembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 17 (Septembre 2011) . - pp. 10229-10245 Titre : Model to simulate the structure of a crystal pillar and optimize the separation efficiency in melt crystallization by fractal theory and technique Type de document : texte imprimé Auteurs : Xiaobin Jiang, Auteur ; Baohong Hou, Auteur ; Jingkang Wang, Auteur Année de publication : 2011 Article en page(s) : pp. 10229-10245 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Fractal  Melt  crystallization  Modeling Résumé : In this paper, an existing fractal porous media model was applied to simulate the structure of the crystal pillar formed in melt crystallization for electronic grade phosphoric acid (EGPA) preparation. The model was modified to meet the crystallization process; the structure parameter of the crystal pillar could be obtained by inspecting the seeping process and measuring the solid-liquid phase equilibrium condition. A characterized factor ϕ with realistic significance was introduced to modify the model, too. The simulation results met the experiment data well. An optimized operation curve was developed to obtain ultrapure EGPA product with higher separation efficiency. An optimized operation was proposed in this paper. Simulating the optimized operation with the model established above, we still obtained a satisfactory result. So the optimized experiment verified the stability and reliability of this model. This model can evaluate the separation effect which is vital to industrial crystal product manufacturing by anticipating the effective porosity of a crystal pillar. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24483667 [article] Model to simulate the structure of a crystal pillar and optimize the separation efficiency in melt crystallization by fractal theory and technique [texte imprimé] / Xiaobin Jiang, Auteur ; Baohong Hou, Auteur ; Jingkang Wang, Auteur . - 2011 . - pp. 10229-10245. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 17 (Septembre 2011) . - pp. 10229-10245 Mots-clés : Fractal  Melt  crystallization  Modeling Résumé : In this paper, an existing fractal porous media model was applied to simulate the structure of the crystal pillar formed in melt crystallization for electronic grade phosphoric acid (EGPA) preparation. The model was modified to meet the crystallization process; the structure parameter of the crystal pillar could be obtained by inspecting the seeping process and measuring the solid-liquid phase equilibrium condition. A characterized factor ϕ with realistic significance was introduced to modify the model, too. The simulation results met the experiment data well. An optimized operation curve was developed to obtain ultrapure EGPA product with higher separation efficiency. An optimized operation was proposed in this paper. Simulating the optimized operation with the model established above, we still obtained a satisfactory result. So the optimized experiment verified the stability and reliability of this model. This model can evaluate the separation effect which is vital to industrial crystal product manufacturing by anticipating the effective porosity of a crystal pillar. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24483667