RELAÇÃO ENTRE POTÊNCIA ELÉTRICA E ENCHIMENTO DE CARGA MOEDORA EM MOINHOS VERTICAIS*
POWER MODELLING FOR BALL CHARGE IN VERTICAL MILLS
Esteves, Priscila; Stopa, Marcelo Martins; Galery, Roberto; Mazzinghy, Douglas Batista; Russo, José Francisco Cabello
http://dx.doi.org/10.4322/2176-1523.1013
Tecnol. Metal. Mater. Min., vol.13, n3, p.288-294, 2016
Resumo
Os moinhos verticais (Vertimill) possuem uma relação entre a potência elétrica consumida e o enchimento de carga moedora, assim como acontece nos moinhos de bolas convencionais (tubulares). Contudo, existem poucas referências na literatura sobre esta relação para os moinhos verticais. Este estudo visa apresentar uma curva de relação entre potência e enchimento de carga moedora para o Vertimill VTM-1500 da Metso. Os dados foram obtidos durante o comissionamento dos moinhos verticais do Projeto Minas-Rio. Todas as grandezas elétricas foram registradas através de um analisador de qualidade de energia, durante o carregamento e descarregamento do moinho. A potência em vazio do moinho foi obtida através da curva de descarregamento e representa 11,6% da potência total. Essa potência é perdida no acionamento na forma de perdas elétricas e mecânicas, não sendo utilizada efetivamente no processo de moagem. Através desta informação é possível determinar a potência líquida de moagem, dado essencial para estudos de comparação da eficiência energética entre moinhos de bolas e moinhos verticais.
Palavras-chave
Moinhos verticais, Vertimill, Eficiência energética, Potência elétrica, Projeto Minas-Rio.
Abstract
The vertical mills (Vertimill) have a relationship between the consumed electric power and the load charge filling, as well as in conventional ball mill (tube). However, there are few references in the literature about this relationship for vertical mills. This study aims to present a curve between power and load charge filling for VTM-1500 Vertimill supplied by Metso. Data were obtained during the mills commissioning of the Minas-Rio Project. All electrical parameters were recorded using a power quality analyzer, during mill loading and unloading. The mill no-load power was obtained by unloading curve and represents 11.6% of the total power. This power is lost in drive by electrical and mechanical losses and is not effectively used in the grinding process. With this information it is possible to determine the net power grinding, important for studies comparing the energy efficiency of ball mills and vertical mills.
Keywords
Vertical mills, Vertimill, Energy efficiency, Electric power, Minas-Rio project.
Referências
1 Metso Minerals. Moinho vertical (VERTIMILL™): moagem de finos e ultrafinos em via úmida. Sorocaba: Metso Minerals; 2006, p. 7.
2 Jankovic A, Morrell S. Power modelling of Stirred mills. In: Proceedings of the 36th Annual Conference of Metallurgists of CIM; 1997 Aug 17-19; Ottawa, Canada. 1997, p. 1-11. [acesso em 03 mar. 2016]. Disponível em: https://www.researchgate.net/publication/288827039_Power_Modelling_of_Stirred_Mills
3 Junior LTS, Gomes MPD, Gomides RB, Junior GGO, Phillips W. Advantages and disadvantages of using tower mill in paracatu Kinross concentrate regrind. In: Anais do 24º Encontro Nacional de Tratamento de Minérios e Metalurgia Extrativa; Out 16-19; Salvador, Brasil. p. 448-455.
4 Nesset JE, Radziszewski P, Hardie C, Leroux DP. Assesing the performance and efficiency of fine grinding technologies. In: Proceedings of the 38th Annual Canadian Mineral Processors Conference; 2006 Jan 17-19; Ottawa, Canada. 2006, p. 283-309.
5 Jankovic A, Valery W, Clarke G. Design and implementation of an AVC grinding circuit at BHP billiton cannington. In: Ptoceedings of the SAG Conference 2006; Vancouver, Canada. 2006. p. 1-11.
6 Mazzinghy DB. Metodologia para escalonamento e simulação de moinho vertical [tese de doutorado]. Belo Horizonte: Programa de Pós-graduação em Engenharia Metalúrgica, Materiais e de Minas/Universidade Federal de Minas Gerais; 2012.
7 Mazzinghy DB, Alves VK, Schneider CL, Faria P, Alvarenga T, Galéry R. Predicting the size distribution in the product and the power requirements of a pilot scale vertimill. In: Proceedings of the 28th International Mineral Processing Conference; 2012 Oct 20-24; Santiago, Chile. 2012, p. 412-420.
8 Mazzinghy DB, Schneider CL, Alves VK, Galéry R. Vertical agitated media mill scale-up and simulation. Minerals Engineering. 2015;73:69-76.
9 Bergerman MG. Dimensionamento e simulação de moinhos verticais [tese de doutorado]. São Paulo: Escola Politécnica/Universidade de São Paulo; 2013.
10 Zheng J, Harris CC, Somasundaran P. Power consumption of stirred media mills. In: Proceedings of SME Annual Meeting. Society for Mining, Metallurgy and Exploration; 1994 Feb 14-17; Albuquerque, New Mexico. 1994, p. 1-8.
11 Zheng J, Harris CC. Power and operating behavior in stirred media mills. In: Proceedings of the 19th International Mineral Processing Congress. Society for Mining, Metallurgy and Exploration;1995 Oct 20-25; San Francisco, USA. 1995, v. 2, p. 47-51.
12 Nitta S, Furuyama T, Bissombolo A, Mori S. Estimation of the motor power of the tower mill through dimensional analysis. In: Proceedings of 23rd International Mineral Processing Congress; 2006 Sept 3-8; Istanbul, Turkey. 2006, p. 158-161.
2 Jankovic A, Morrell S. Power modelling of Stirred mills. In: Proceedings of the 36th Annual Conference of Metallurgists of CIM; 1997 Aug 17-19; Ottawa, Canada. 1997, p. 1-11. [acesso em 03 mar. 2016]. Disponível em: https://www.researchgate.net/publication/288827039_Power_Modelling_of_Stirred_Mills
3 Junior LTS, Gomes MPD, Gomides RB, Junior GGO, Phillips W. Advantages and disadvantages of using tower mill in paracatu Kinross concentrate regrind. In: Anais do 24º Encontro Nacional de Tratamento de Minérios e Metalurgia Extrativa; Out 16-19; Salvador, Brasil. p. 448-455.
4 Nesset JE, Radziszewski P, Hardie C, Leroux DP. Assesing the performance and efficiency of fine grinding technologies. In: Proceedings of the 38th Annual Canadian Mineral Processors Conference; 2006 Jan 17-19; Ottawa, Canada. 2006, p. 283-309.
5 Jankovic A, Valery W, Clarke G. Design and implementation of an AVC grinding circuit at BHP billiton cannington. In: Ptoceedings of the SAG Conference 2006; Vancouver, Canada. 2006. p. 1-11.
6 Mazzinghy DB. Metodologia para escalonamento e simulação de moinho vertical [tese de doutorado]. Belo Horizonte: Programa de Pós-graduação em Engenharia Metalúrgica, Materiais e de Minas/Universidade Federal de Minas Gerais; 2012.
7 Mazzinghy DB, Alves VK, Schneider CL, Faria P, Alvarenga T, Galéry R. Predicting the size distribution in the product and the power requirements of a pilot scale vertimill. In: Proceedings of the 28th International Mineral Processing Conference; 2012 Oct 20-24; Santiago, Chile. 2012, p. 412-420.
8 Mazzinghy DB, Schneider CL, Alves VK, Galéry R. Vertical agitated media mill scale-up and simulation. Minerals Engineering. 2015;73:69-76.
9 Bergerman MG. Dimensionamento e simulação de moinhos verticais [tese de doutorado]. São Paulo: Escola Politécnica/Universidade de São Paulo; 2013.
10 Zheng J, Harris CC, Somasundaran P. Power consumption of stirred media mills. In: Proceedings of SME Annual Meeting. Society for Mining, Metallurgy and Exploration; 1994 Feb 14-17; Albuquerque, New Mexico. 1994, p. 1-8.
11 Zheng J, Harris CC. Power and operating behavior in stirred media mills. In: Proceedings of the 19th International Mineral Processing Congress. Society for Mining, Metallurgy and Exploration;1995 Oct 20-25; San Francisco, USA. 1995, v. 2, p. 47-51.
12 Nitta S, Furuyama T, Bissombolo A, Mori S. Estimation of the motor power of the tower mill through dimensional analysis. In: Proceedings of 23rd International Mineral Processing Congress; 2006 Sept 3-8; Istanbul, Turkey. 2006, p. 158-161.
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