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Contact angle and bubble attachment studies in the flotation of trona and other soluble carbonate salts / O. Ozdemir in Minerals engineering, Vol. 22 N° 2 (Janvier 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 2 (Janvier 2009) . - pp. 168–175 Titre : Contact angle and bubble attachment studies in the flotation of trona and other soluble carbonate salts Type de document : texte imprimé Auteurs : O. Ozdemir, Auteur ; C. Karaguzel, Auteur ; A.V. Nguyen, Auteur Année de publication : 2009 Article en page(s) : pp. 168–175 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Industrial  minerals  Trona  Froth  flotation  Thin-layer  wicking  method  Bubble  attachment  time Index. décimale : 622 Industrie minière Résumé : Trona, Na2CO3 · NaHCO3 · 2H2O, is mined as the primary source for sodium carbonate production in the United States. Recent studies have shown that the flotation method can be used for pre-processing of trona ore to remove insoluble mineral contaminants for the production of soda ash (sodium carbonate). Studies with carbonate salts suggest that certain important factors can affect their flotation response, including viscosity of the brine and interfacial water structure. Flotation studies showed that contrary to the strong flotation of NaHCO3 with both anionic and cationic collectors, Na2CO3 does not float at all. Based on the analysis of interfacial water structure in saturated brines, Na2CO3 was found to act as a strong water structure maker, whereas NaHCO3 acts as a weak water structure maker. Bubble attachment time measurements suggest that collector adsorption at the surface of NaHCO3 induces flotation; this is not the case for Na2CO3. Contact angle measurements indicated that the surface of Na2CO3 is hydrated to a great extent, whereas the NaHCO3 salt surface is less hydrated. These results reveal that there is a strong relationship between the interfacial water structure and the contact angle of these salts. The less stable NaHCO3 surface is ascribed to the interfacial water structure which allows for NaHCO3 flotation with both anionic and cationic collectors. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508001647 [article] Contact angle and bubble attachment studies in the flotation of trona and other soluble carbonate salts [texte imprimé] / O. Ozdemir, Auteur ; C. Karaguzel, Auteur ; A.V. Nguyen, Auteur . - 2009 . - pp. 168–175. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 2 (Janvier 2009) . - pp. 168–175 Mots-clés : Industrial  minerals  Trona  Froth  flotation  Thin-layer  wicking  method  Bubble  attachment  time Index. décimale : 622 Industrie minière Résumé : Trona, Na2CO3 · NaHCO3 · 2H2O, is mined as the primary source for sodium carbonate production in the United States. Recent studies have shown that the flotation method can be used for pre-processing of trona ore to remove insoluble mineral contaminants for the production of soda ash (sodium carbonate). Studies with carbonate salts suggest that certain important factors can affect their flotation response, including viscosity of the brine and interfacial water structure. Flotation studies showed that contrary to the strong flotation of NaHCO3 with both anionic and cationic collectors, Na2CO3 does not float at all. Based on the analysis of interfacial water structure in saturated brines, Na2CO3 was found to act as a strong water structure maker, whereas NaHCO3 acts as a weak water structure maker. Bubble attachment time measurements suggest that collector adsorption at the surface of NaHCO3 induces flotation; this is not the case for Na2CO3. Contact angle measurements indicated that the surface of Na2CO3 is hydrated to a great extent, whereas the NaHCO3 salt surface is less hydrated. These results reveal that there is a strong relationship between the interfacial water structure and the contact angle of these salts. The less stable NaHCO3 surface is ascribed to the interfacial water structure which allows for NaHCO3 flotation with both anionic and cationic collectors. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508001647

Evaluation of flotation technology for the trona industry / O. Ozdemir in Minerals engineering, Vol. 23 N° 1 (Janvier 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 1 (Janvier 2010) . - pp. 1-9 Titre : Evaluation of flotation technology for the trona industry Type de document : texte imprimé Auteurs : O. Ozdemir, Auteur ; A. Jain, Auteur ; V. Gupta, Auteur Article en page(s) : pp. 1-9 Note générale : Génie Minier Métallurgie Langues : Anglais (eng) Mots-clés : Trona  Soda  ash  Soluble  minerals  Flotation Index. décimale : 622 Industrie minière Résumé : Trona ore consists mainly of trona, sodium sesquicarbonate dihydrate (Na2CO3·NaHCO3·2H2O), including minor undesirable insoluble materials. With the present industrial practice, there is no particle separation process to remove these insoluble minerals prior to thermochemical processing. In this current research appropriate conditions for trona flotation technology were established from exploratory bench-scale experiments, and the conditions obtained from the bench-scale experiments were also applied to pilot scale flotation tests. In this regard various process variables such as amine dosage, flotation percent solids, amine to oil ratio, pH of amine solution, collector structure, brine composition, feed particle size, etc. were studied to establish the preferred conditions and operating variables for pilot-plant testing. Additional information regarding the mineralogy of the system and collector characteristics is also reported to provide further analysis and explanation. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6VDR-4XDKC9K-1&_user=6 [...] [article] Evaluation of flotation technology for the trona industry [texte imprimé] / O. Ozdemir, Auteur ; A. Jain, Auteur ; V. Gupta, Auteur . - pp. 1-9. Génie Minier Métallurgie Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 1 (Janvier 2010) . - pp. 1-9 Mots-clés : Trona  Soda  ash  Soluble  minerals  Flotation Index. décimale : 622 Industrie minière Résumé : Trona ore consists mainly of trona, sodium sesquicarbonate dihydrate (Na2CO3·NaHCO3·2H2O), including minor undesirable insoluble materials. With the present industrial practice, there is no particle separation process to remove these insoluble minerals prior to thermochemical processing. In this current research appropriate conditions for trona flotation technology were established from exploratory bench-scale experiments, and the conditions obtained from the bench-scale experiments were also applied to pilot scale flotation tests. In this regard various process variables such as amine dosage, flotation percent solids, amine to oil ratio, pH of amine solution, collector structure, brine composition, feed particle size, etc. were studied to establish the preferred conditions and operating variables for pilot-plant testing. Additional information regarding the mineralogy of the system and collector characteristics is also reported to provide further analysis and explanation. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6VDR-4XDKC9K-1&_user=6 [...]