Ice slurry generator using freezing-point depression by pressurization – Case of low-concentration NaCl aqueous solution / K. Fumoto in International journal of refrigeration, Vol. 36 N° 3 (Mai 2013)  

Public ISBD [article]  inInternational journal of refrigeration > Vol. 36 N° 3 (Mai 2013) . - pp. 795–800 Titre : Ice slurry generator using freezing-point depression by pressurization – Case of low-concentration NaCl aqueous solution Titre original : Générateur de coulis de glace faisant appel à l'abaissement du point de congélation par pressurisation – le cas d'une solution aqueuse à faible concentration de NaCl Type de document : texte imprimé Auteurs : K. Fumoto, Auteur ; T. Sato, Auteur ; Tsuyoshi Kawanami, Auteur Année de publication : 2013 Article en page(s) : pp. 795–800 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Ice slurry  Freezing-point depression  Pressurization  Sodium chloride  Aqueous solution  Supercooled state  Solidification Résumé : Ice slurry, which is a mixture of fine ice crystals and liquid water, is utilized in ice storage systems owing to its good flowability and large latent heat of fusion. In the present study, a method was developed to generate ice slurry without the deposition of an ice layer on a cooled surface. This method is based on freezing-point depression of the aqueous solution, which is maintained under highpressure conditions. To control the timing for solidification and to generate ice slurry, we investigated the relationships among the pressure, temperature, and concentration of the aqueous solutions. We developed an ice slurry generator based on the new method that controls the pressure and temperature of the aqueous solution. Experimental results showed that the characteristics of the ice slurry generation were closely related to the pressure and initial stage temperature of the test fluid. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713000029 [article] Ice slurry generator using freezing-point depression by pressurization – Case of low-concentration NaCl aqueous solution = Générateur de coulis de glace faisant appel à l'abaissement du point de congélation par pressurisation – le cas d'une solution aqueuse à faible concentration de NaCl [texte imprimé] / K. Fumoto, Auteur ; T. Sato, Auteur ; Tsuyoshi Kawanami, Auteur . - 2013 . - pp. 795–800. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 3 (Mai 2013) . - pp. 795–800 Mots-clés : Ice slurry  Freezing-point depression  Pressurization  Sodium chloride  Aqueous solution  Supercooled state  Solidification Résumé : Ice slurry, which is a mixture of fine ice crystals and liquid water, is utilized in ice storage systems owing to its good flowability and large latent heat of fusion. In the present study, a method was developed to generate ice slurry without the deposition of an ice layer on a cooled surface. This method is based on freezing-point depression of the aqueous solution, which is maintained under highpressure conditions. To control the timing for solidification and to generate ice slurry, we investigated the relationships among the pressure, temperature, and concentration of the aqueous solutions. We developed an ice slurry generator based on the new method that controls the pressure and temperature of the aqueous solution. Experimental results showed that the characteristics of the ice slurry generation were closely related to the pressure and initial stage temperature of the test fluid. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713000029

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Incorporation of arsenic during the formation of Mg-bearing minerals at alkaline condition / E.M. Opiso in Minerals engineering, Vol. 23 N° 3 (Fevrier 2010)  

Public ISBD [article]  inMinerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 230–237 Titre : Incorporation of arsenic during the formation of Mg-bearing minerals at alkaline condition Type de document : texte imprimé Auteurs : E.M. Opiso, Auteur ; T. Sato, Auteur ; K. Morimoto, Auteur Année de publication : 2011 Article en page(s) : pp. 230–237 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Arsenic Incorporation Alkaline wastes Mg-bearing minerals Résumé : The release of toxic anions during the chemical weathering of alkaline wastes such as blast furnace slag and coal fly ash presents a serious problem to public health and the environment. This study investigated arsenate sorption behavior onto Mg-bearing minerals formed in the Mg–Si–Al system at alkaline pH conditions in order to understand the safe removal and encapsulation of arsenate by Mg-bearing minerals under such conditions. Sorption experiments were performed during and after mineral formation and leaching tests using phosphate bearing solution were conducted to understand arsenic association with the minerals. The results revealed that brucite (Mg(OH)2), hydrotalcite (Mg6Al2(CO3)(OH)16·4(H2O)) and serpentine (MgSi2O5(OH)4) have high uptake capacity for arsenate. However, arsenic incorporation was only observed during the formation of high Al content hydrotalcite and serpentine minerals and was greatly enhanced at higher temperature. This implies that by controlling pore water chemistry of alkaline wastes with high reactivity, the irreversible fixation of arsenic by Mg-bearing minerals in alkaline conditions can be expected. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509001939 [article] Incorporation of arsenic during the formation of Mg-bearing minerals at alkaline condition [texte imprimé] / E.M. Opiso, Auteur ; T. Sato, Auteur ; K. Morimoto, Auteur . - 2011 . - pp. 230–237. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 230–237 Mots-clés : Arsenic Incorporation Alkaline wastes Mg-bearing minerals Résumé : The release of toxic anions during the chemical weathering of alkaline wastes such as blast furnace slag and coal fly ash presents a serious problem to public health and the environment. This study investigated arsenate sorption behavior onto Mg-bearing minerals formed in the Mg–Si–Al system at alkaline pH conditions in order to understand the safe removal and encapsulation of arsenate by Mg-bearing minerals under such conditions. Sorption experiments were performed during and after mineral formation and leaching tests using phosphate bearing solution were conducted to understand arsenic association with the minerals. The results revealed that brucite (Mg(OH)2), hydrotalcite (Mg6Al2(CO3)(OH)16·4(H2O)) and serpentine (MgSi2O5(OH)4) have high uptake capacity for arsenate. However, arsenic incorporation was only observed during the formation of high Al content hydrotalcite and serpentine minerals and was greatly enhanced at higher temperature. This implies that by controlling pore water chemistry of alkaline wastes with high reactivity, the irreversible fixation of arsenic by Mg-bearing minerals in alkaline conditions can be expected. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509001939

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