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Investigation into the flotation response of a sulphide ore to depressant mixtures / K.C. Corin in Minerals engineering, Vol. 23 N° 11-13 (Octobre 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 11-13 (Octobre 2010) . - pp. 915–920 Titre : Investigation into the flotation response of a sulphide ore to depressant mixtures Type de document : texte imprimé Auteurs : K.C. Corin, Auteur ; P.J. Harris, Auteur Année de publication : 2011 Article en page(s) : pp. 915–920 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Sulphide  ores  Froth  flotation  Flotation  depressants Résumé : The Merensky reef in the Bushveld Complex is well-known to contain a number of platinum group elements (PGEs). These PGEs are strongly associated with the sulphide minerals found in the Merensky reef. In order to recover the PGEs from the Merensky reef, a combination of reagents is used to optimise the flotation process by various operations across the Bushveld Complex. These reagents usually include; collectors, activators and depressants. The most common collectors are the xanthates, while the activator copper sulphate (CuSO4) is most often used. The depressants, either carboxymethylcellulose (CMC) or modified guar gum (guar) are typical. This study examines the effect of blending depressants on the flotation response of a typical Merensky ore. The effect of each depressant, being guar and CMC, was examined in turn by changing the concentrations used in initial flotation tests; this was followed by blending guar and CMC in equal ratios by various procedures to determine the effects thereof. The depressants were blended in two ways: (1) premixed followed by a single conditioning stage and (2) stage wise; as primary and secondary depressants, each conditioned in turn. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510000580 [article] Investigation into the flotation response of a sulphide ore to depressant mixtures [texte imprimé] / K.C. Corin, Auteur ; P.J. Harris, Auteur . - 2011 . - pp. 915–920. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 11-13 (Octobre 2010) . - pp. 915–920 Mots-clés : Sulphide  ores  Froth  flotation  Flotation  depressants Résumé : The Merensky reef in the Bushveld Complex is well-known to contain a number of platinum group elements (PGEs). These PGEs are strongly associated with the sulphide minerals found in the Merensky reef. In order to recover the PGEs from the Merensky reef, a combination of reagents is used to optimise the flotation process by various operations across the Bushveld Complex. These reagents usually include; collectors, activators and depressants. The most common collectors are the xanthates, while the activator copper sulphate (CuSO4) is most often used. The depressants, either carboxymethylcellulose (CMC) or modified guar gum (guar) are typical. This study examines the effect of blending depressants on the flotation response of a typical Merensky ore. The effect of each depressant, being guar and CMC, was examined in turn by changing the concentrations used in initial flotation tests; this was followed by blending guar and CMC in equal ratios by various procedures to determine the effects thereof. The depressants were blended in two ways: (1) premixed followed by a single conditioning stage and (2) stage wise; as primary and secondary depressants, each conditioned in turn. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510000580

The effect of increased frother dosage on froth stability at high depressant dosages / J.G. Wiese in Minerals engineering, Vol. 23 N° 11-13 (Octobre 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 11-13 (Octobre 2010) . - pp. 1010–1017 Titre : The effect of increased frother dosage on froth stability at high depressant dosages Type de document : texte imprimé Auteurs : J.G. Wiese, Auteur ; P.J. Harris, Auteur ; D. J. Bradshaw, Auteur Année de publication : 2011 Article en page(s) : pp. 1010–1017 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Precious  metal  ores  Froth  flotation  Flotation  depressants  Flotation  frothers Résumé : High energy costs required to smelt low grade concentrates could be alleviated by the production of high grade concentrates. Obtaining maximum PGM recovery by the use of high dosages of polysaccharide depressants may be problematic in that a significant decrease in the stability of the froth, particularly with CMC, results. These highly unstable froths may result in restricted mass pulls and decreased valuable mineral recovery. There are a number of ways of counteracting unstable froths, such as increasing airflow rate, reducing froth height or increasing frother dosage. Although necessary to maximise PGM recovery, all of these are likely to lead to increased water recovery and dilution of the concentrate by entrained material. This work examines the effect of increasing frother dosage on the recovery of sulphide minerals and floatable gangue from a Merensky ore at varying dosages of guar gum and CMC, as well as on the recovery of entrained gangue and its dependence on the physical nature of the flotation pulp. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001196 [article] The effect of increased frother dosage on froth stability at high depressant dosages [texte imprimé] / J.G. Wiese, Auteur ; P.J. Harris, Auteur ; D. J. Bradshaw, Auteur . - 2011 . - pp. 1010–1017. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 11-13 (Octobre 2010) . - pp. 1010–1017 Mots-clés : Precious  metal  ores  Froth  flotation  Flotation  depressants  Flotation  frothers Résumé : High energy costs required to smelt low grade concentrates could be alleviated by the production of high grade concentrates. Obtaining maximum PGM recovery by the use of high dosages of polysaccharide depressants may be problematic in that a significant decrease in the stability of the froth, particularly with CMC, results. These highly unstable froths may result in restricted mass pulls and decreased valuable mineral recovery. There are a number of ways of counteracting unstable froths, such as increasing airflow rate, reducing froth height or increasing frother dosage. Although necessary to maximise PGM recovery, all of these are likely to lead to increased water recovery and dilution of the concentrate by entrained material. This work examines the effect of increasing frother dosage on the recovery of sulphide minerals and floatable gangue from a Merensky ore at varying dosages of guar gum and CMC, as well as on the recovery of entrained gangue and its dependence on the physical nature of the flotation pulp. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001196