Documents disponibles écrits par cet auteur

Flotation rate distribution in the collection zone of industrial cells / J. Yianatos in Minerals engineering, Vol. 23 N° 11-13 (Octobre 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 11-13 (Octobre 2010) . - pp. 1030–1035 Titre : Flotation rate distribution in the collection zone of industrial cells Type de document : texte imprimé Auteurs : J. Yianatos, Auteur ; L. Bergh, Auteur ; L. Vinnett, Auteur Année de publication : 2011 Article en page(s) : pp. 1030–1035 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Flotation  Flotation  rate  distribution  Industrial  cells  Radioactive  tracer Résumé : The batch flotation process has been commonly characterized assuming a flotation rate distribution function F(k), e.g.: Dirac delta, Rectangular, Gamma or Weibull functions. The identification of F(k) for the collection zone of continuous industrial cells is more complex and to the authors knowledge, has not been reported yet. In this work, a novel procedure to estimate the flotation rate distribution from the collection zone of industrial flotation cells, using the radioactive tracer technique, is presented. The approach consists of measuring the impulse response of the floatable mineral tracer concentration, and non-floatable gangue tracer concentration (Residence Time Distribution, RTD), in the cell tailings. Then, the floatable tracer concentration can be compared with the model prediction, using the Gamma function and the RTD of the non-floatable tracer. Thus, the F(k) distribution parameters were obtained by means of the least-square estimation. The new approach was successfully tested in industrial rougher flotation cells of large size. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S089268751000141X [article] Flotation rate distribution in the collection zone of industrial cells [texte imprimé] / J. Yianatos, Auteur ; L. Bergh, Auteur ; L. Vinnett, Auteur . - 2011 . - pp. 1030–1035. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 11-13 (Octobre 2010) . - pp. 1030–1035 Mots-clés : Flotation  Flotation  rate  distribution  Industrial  cells  Radioactive  tracer Résumé : The batch flotation process has been commonly characterized assuming a flotation rate distribution function F(k), e.g.: Dirac delta, Rectangular, Gamma or Weibull functions. The identification of F(k) for the collection zone of continuous industrial cells is more complex and to the authors knowledge, has not been reported yet. In this work, a novel procedure to estimate the flotation rate distribution from the collection zone of industrial flotation cells, using the radioactive tracer technique, is presented. The approach consists of measuring the impulse response of the floatable mineral tracer concentration, and non-floatable gangue tracer concentration (Residence Time Distribution, RTD), in the cell tailings. Then, the floatable tracer concentration can be compared with the model prediction, using the Gamma function and the RTD of the non-floatable tracer. Thus, the F(k) distribution parameters were obtained by means of the least-square estimation. The new approach was successfully tested in industrial rougher flotation cells of large size. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S089268751000141X

Measurement of particle loading on bubbles in the flotation process / M. H. Moys in Minerals engineering, Vol. 23 N° 2 (Janvier 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 2 (Janvier 2010) . - pp. 131-136 Titre : Measurement of particle loading on bubbles in the flotation process Type de document : texte imprimé Auteurs : M. H. Moys, Auteur ; J. Yianatos, Auteur ; J. Larenas, Auteur Article en page(s) : pp. 131-136 Note générale : Génie Minier Métallurgie Langues : Anglais (eng) Mots-clés : Flotation  Forth  recovery  Bubble  load  Measurement Index. décimale : 622 Industrie minière Résumé : Methods for estimation or measurement of particle loading on bubbles in the flotation process are reviewed. The paper focuses on direct measurement methods developed under the direction of Moys at the University of the Witwatersrand and by Seaman and co-workers at the JKMRC, Brisbane, Australia. Deficiencies in both designs are identified and a new design which deals with all these deficiencies is proposed. A hydrodynamic model for this version is developed and tested in a water-only environment, then tested on the copper flotation plant at El Teniente. It was found that the new design had successfully dealt with prior method deficiencies and provided a very precise (relative standard deviation equal to 0.72%) measurement of the loading on the bubbles in five tests. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6VDR-4XDKC9K-1&_user=6 [...] [article] Measurement of particle loading on bubbles in the flotation process [texte imprimé] / M. H. Moys, Auteur ; J. Yianatos, Auteur ; J. Larenas, Auteur . - pp. 131-136. Génie Minier Métallurgie Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 2 (Janvier 2010) . - pp. 131-136 Mots-clés : Flotation  Forth  recovery  Bubble  load  Measurement Index. décimale : 622 Industrie minière Résumé : Methods for estimation or measurement of particle loading on bubbles in the flotation process are reviewed. The paper focuses on direct measurement methods developed under the direction of Moys at the University of the Witwatersrand and by Seaman and co-workers at the JKMRC, Brisbane, Australia. Deficiencies in both designs are identified and a new design which deals with all these deficiencies is proposed. A hydrodynamic model for this version is developed and tested in a water-only environment, then tested on the copper flotation plant at El Teniente. It was found that the new design had successfully dealt with prior method deficiencies and provided a very precise (relative standard deviation equal to 0.72%) measurement of the loading on the bubbles in five tests. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6VDR-4XDKC9K-1&_user=6 [...]

A novel scale-up approach for mechanical flotation cells / J. Yianatos in Minerals engineering, Vol. 23 N° 11-13 (Octobre 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 11-13 (Octobre 2010) . - pp. 877–884 Titre : A novel scale-up approach for mechanical flotation cells Type de document : texte imprimé Auteurs : J. Yianatos, Auteur ; F. Contreras, Auteur ; P. Morales, Auteur Année de publication : 2011 Article en page(s) : pp. 877–884 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Flotation  cells  Modeling  Scale-up  Simulation  Flotation  rate Résumé : Planning industrial flotation operation and earlier flotation equipment sizing are commonly based on batch flotation testing, where ideal operating conditions can be provided. Each plant has its own batch flotation standards and typically uses a time scale-up factor in order to compare laboratory and plant flotation performance. However, flotation scale-up is more complex, and it is not yet completely understood. In this work, a novel scale-up approach was developed, where the effects of the hydrodynamic regime (mixing), solid segregation (effective residence time) and froth recovery on the plant flotation rate were identified and evaluated. Each effect was then described by means of correction factors applied on the batch flotation rate, which was considered the optimal condition. These factors can be determined from laboratory and plant experimental data. This methodology was successfully applied at the rougher copper flotation plant of Codelco Norte Division, Codelco-Chile, for cells of 160 and 300 m3. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001251 [article] A novel scale-up approach for mechanical flotation cells [texte imprimé] / J. Yianatos, Auteur ; F. Contreras, Auteur ; P. Morales, Auteur . - 2011 . - pp. 877–884. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 11-13 (Octobre 2010) . - pp. 877–884 Mots-clés : Flotation  cells  Modeling  Scale-up  Simulation  Flotation  rate Résumé : Planning industrial flotation operation and earlier flotation equipment sizing are commonly based on batch flotation testing, where ideal operating conditions can be provided. Each plant has its own batch flotation standards and typically uses a time scale-up factor in order to compare laboratory and plant flotation performance. However, flotation scale-up is more complex, and it is not yet completely understood. In this work, a novel scale-up approach was developed, where the effects of the hydrodynamic regime (mixing), solid segregation (effective residence time) and froth recovery on the plant flotation rate were identified and evaluated. Each effect was then described by means of correction factors applied on the batch flotation rate, which was considered the optimal condition. These factors can be determined from laboratory and plant experimental data. This methodology was successfully applied at the rougher copper flotation plant of Codelco Norte Division, Codelco-Chile, for cells of 160 and 300 m3. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001251