Documents disponibles écrits par cet auteur

An experimental investigation of the effects of operating parameters on the wear of lifters in tumbling mills / M. Rezaeizadeh in Minerals engineering, Vol. 23 N° 7 (Juin 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 7 (Juin 2010) . - pp. 558–562 Titre : An experimental investigation of the effects of operating parameters on the wear of lifters in tumbling mills Type de document : texte imprimé Auteurs : M. Rezaeizadeh, Auteur ; M. Fooladi, Auteur ; M.S. Powell, Auteur Année de publication : 2011 Article en page(s) : pp. 558–562 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Mineral  processing  Comminution  Grinding  Particle  size Résumé : Lifters are usually used with mill liners to extend their life and to enhance the grinding and crushing efficiency. Although the lifters are durable wear parts but they will gradually worn and consequently their dimensions change during the course of operation. These changes in dimensions have a significant influence on the overall economic performance of the mills. Therefore, it is useful to know the relationship between the mill operation and the lifter profile, and the influence of lifter wear on the change in lifter profile. In this work, a laboratory mill which is capable of producing the required impact and abrasion grinding was operated both wet and dry. Many factors were varied such as: velocity, charge, ore size and different material for the lifters. Also the wear rate on the top and face of lifters are compared in the different conditions. It is found that the mill charge and the mill speed significantly affect the wear rate. Also, the results showed how size distribution affects the wear rate. The results can be interpreted in terms of the wear process in industrial scale mills over different operating conditions. The experimental results provide the possibility of including the lifter wear in optimising mill performance. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509003070 [article] An experimental investigation of the effects of operating parameters on the wear of lifters in tumbling mills [texte imprimé] / M. Rezaeizadeh, Auteur ; M. Fooladi, Auteur ; M.S. Powell, Auteur . - 2011 . - pp. 558–562. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 7 (Juin 2010) . - pp. 558–562 Mots-clés : Mineral  processing  Comminution  Grinding  Particle  size Résumé : Lifters are usually used with mill liners to extend their life and to enhance the grinding and crushing efficiency. Although the lifters are durable wear parts but they will gradually worn and consequently their dimensions change during the course of operation. These changes in dimensions have a significant influence on the overall economic performance of the mills. Therefore, it is useful to know the relationship between the mill operation and the lifter profile, and the influence of lifter wear on the change in lifter profile. In this work, a laboratory mill which is capable of producing the required impact and abrasion grinding was operated both wet and dry. Many factors were varied such as: velocity, charge, ore size and different material for the lifters. Also the wear rate on the top and face of lifters are compared in the different conditions. It is found that the mill charge and the mill speed significantly affect the wear rate. Also, the results showed how size distribution affects the wear rate. The results can be interpreted in terms of the wear process in industrial scale mills over different operating conditions. The experimental results provide the possibility of including the lifter wear in optimising mill performance. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509003070

Applying grindcurves to mill operation and optimisation / M.S. Powell in Minerals engineering, Vol. 22 N° 7/8 (Juin/Juillet 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 625–632 Titre : Applying grindcurves to mill operation and optimisation Type de document : texte imprimé Auteurs : M.S. Powell, Auteur ; A.P. Van Der Westhuizen, Auteur ; A.N. Mainza, Auteur Année de publication : 2009 Article en page(s) : pp. 625–632 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Comminution  Grinding  SAG  milling  Process  control Résumé : The operation of AG/SAG mills is sensitive to mill filling, therefore developing grindcurves to relate mill filling to performance indicators such as throughput, power draw, and product size can assist in achieving optimal mill operations. The throughput, power draw, and product size have been shown to peak at different mill filling levels. Establishing grindcurves can assist operators to decide on the best set point for operating their mill. Factors such as mill speed, mill inlet water, feed size distribution, and ore hardness all have an influence on the grindcurve, and form an integral part of the optimisation process. Test work has been conducted at a number of sites to develop grindcurves for different mills treating a range of ores. The results show great promise for use in optimising the operating set points for use in mill control. The methodology for developing grindcurves is described and the results from the case studies performed on fixed and variable speed mills are discussed. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000053 [article] Applying grindcurves to mill operation and optimisation [texte imprimé] / M.S. Powell, Auteur ; A.P. Van Der Westhuizen, Auteur ; A.N. Mainza, Auteur . - 2009 . - pp. 625–632. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 625–632 Mots-clés : Comminution  Grinding  SAG  milling  Process  control Résumé : The operation of AG/SAG mills is sensitive to mill filling, therefore developing grindcurves to relate mill filling to performance indicators such as throughput, power draw, and product size can assist in achieving optimal mill operations. The throughput, power draw, and product size have been shown to peak at different mill filling levels. Establishing grindcurves can assist operators to decide on the best set point for operating their mill. Factors such as mill speed, mill inlet water, feed size distribution, and ore hardness all have an influence on the grindcurve, and form an integral part of the optimisation process. Test work has been conducted at a number of sites to develop grindcurves for different mills treating a range of ores. The results show great promise for use in optimising the operating set points for use in mill control. The methodology for developing grindcurves is described and the results from the case studies performed on fixed and variable speed mills are discussed. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000053

Experimental observations of lifter parameters and mill operation on power draw and liner impact loading / M. Rezaeizadeh in Minerals engineering, Vol. 23 N° 15 (Décembre 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 15 (Décembre 2010) . - pp. 1182–1191 Titre : Experimental observations of lifter parameters and mill operation on power draw and liner impact loading Type de document : texte imprimé Auteurs : M. Rezaeizadeh, Auteur ; M. Fooladi, Auteur ; M.S. Powell, Auteur Année de publication : 2011 Article en page(s) : pp. 1182–1191 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Comminution  Grinding  Crushing  SAG  mill Résumé : In mineral processing the mill power plays a major role in the economics of the process and is a critical design criterion. The mill power is influenced by a range of parameters such as: charge and slurry filling, number and geometry of lifters, and mill speed. Deriving the optimum conditions of these parameters should lead to efficient mill operation. Additionally, the optimum utilization of the impact loads that are affected by charge and slurry filling, number of lifters, geometry of lifter and mill speed should result in increased milling efficiency. In this work the influence of these operating parameters were investigated using a laboratory experimental mill. It is found that the power, are affected by number of lifters, lifter height, mill charge and mill speed. Overall the results showed that increasing the mill velocity, number of lifters, and height of lifter and significantly decreasing the mill charge filling results in a higher impact value and impact frequency that may also increase overall efficiency. A simple linear regression relationship has been demonstrated for mill power as a function of lifter spacing (S/H) and mill speed. These parameters give an indication of the possible optimum mill operating conditions in an idealised condition. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001986 [article] Experimental observations of lifter parameters and mill operation on power draw and liner impact loading [texte imprimé] / M. Rezaeizadeh, Auteur ; M. Fooladi, Auteur ; M.S. Powell, Auteur . - 2011 . - pp. 1182–1191. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 15 (Décembre 2010) . - pp. 1182–1191 Mots-clés : Comminution  Grinding  Crushing  SAG  mill Résumé : In mineral processing the mill power plays a major role in the economics of the process and is a critical design criterion. The mill power is influenced by a range of parameters such as: charge and slurry filling, number and geometry of lifters, and mill speed. Deriving the optimum conditions of these parameters should lead to efficient mill operation. Additionally, the optimum utilization of the impact loads that are affected by charge and slurry filling, number of lifters, geometry of lifter and mill speed should result in increased milling efficiency. In this work the influence of these operating parameters were investigated using a laboratory experimental mill. It is found that the power, are affected by number of lifters, lifter height, mill charge and mill speed. Overall the results showed that increasing the mill velocity, number of lifters, and height of lifter and significantly decreasing the mill charge filling results in a higher impact value and impact frequency that may also increase overall efficiency. A simple linear regression relationship has been demonstrated for mill power as a function of lifter spacing (S/H) and mill speed. These parameters give an indication of the possible optimum mill operating conditions in an idealised condition. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001986

A new predictive model of lifter bar wear in mills / M. Rezaeizadeh in Minerals engineering, Vol. 23 N° 15 (Décembre 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 15 (Décembre 2010) . - pp. 1174–1181 Titre : A new predictive model of lifter bar wear in mills Type de document : texte imprimé Auteurs : M. Rezaeizadeh, Auteur ; M. Fooladi, Auteur ; M.S. Powell, Auteur Année de publication : 2011 Article en page(s) : pp. 1174–1181 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Mineral  processing  Comminution  Grinding  Particle  size Résumé : The cost of mill relining and the influence of the liner profiles on mill performance provide a strong motivation to improve liner selection. However, the capability to predict liner life and progressive profile is poorly developed in the industry. A new model has been developed to predict the rate of liner wear based on the main parameters affecting the wear process such as; ore type, relative velocity between the ore and the liners, liner hardness and friction conditions. The resultant model is capable of determining the wear as a function of mill operating and discharge conditions based on the variation of specific gravity of mill contents, geometrical characteristics of the mill and mill velocity. The results from this model are in good agreement with the measured data from the SAG mill at Sarcheshmeh Copper Complex, Iran. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001974 [article] A new predictive model of lifter bar wear in mills [texte imprimé] / M. Rezaeizadeh, Auteur ; M. Fooladi, Auteur ; M.S. Powell, Auteur . - 2011 . - pp. 1174–1181. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 15 (Décembre 2010) . - pp. 1174–1181 Mots-clés : Mineral  processing  Comminution  Grinding  Particle  size Résumé : The cost of mill relining and the influence of the liner profiles on mill performance provide a strong motivation to improve liner selection. However, the capability to predict liner life and progressive profile is poorly developed in the industry. A new model has been developed to predict the rate of liner wear based on the main parameters affecting the wear process such as; ore type, relative velocity between the ore and the liners, liner hardness and friction conditions. The resultant model is capable of determining the wear as a function of mill operating and discharge conditions based on the variation of specific gravity of mill contents, geometrical characteristics of the mill and mill velocity. The results from this model are in good agreement with the measured data from the SAG mill at Sarcheshmeh Copper Complex, Iran. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001974