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Grau de liberação de diferentes tipos de minério de ferro das Minas de Alegria (Mariana-MG) e sua influência nas etapas de cominuição e concentração
(Universidade Federal de Minas GeraisUFMG, 2016-05-31)
The mineral liberation, obtained from reducing the particle size by grinding, is one of the basic concepts for the flotation process. Only the quantification of the liberation degree of quartz does not provide the necessary ...
Avaliação das diferenças entre bolas forjadas e bolas fundidas no processo de moagem
(Universidade Federal de Minas GeraisUFMG, 2015-02-04)
The differences in grinding capacity and wear between cast iron balls and forged steel balls was investigated based on grinding efficiency and wear experiments conducted in a mill with dimensions 0.3048m x 0.3048. The ...
Avaliação de moagem em circuito aberto e com peneira de alta frequência para minério de magnesita
(Universidade Federal de Minas GeraisUFMG, 2017-01-01)
The magnesite ores processing operation in Brumado needs to increase its production tonnage by 20% and the comminution stage was identified as the process main bottleneck. Currently, the process has four ball mills in ...
Mecânica dos fluidos computacional aplicada aos separadores dinâmicos de primeira geração da indústria cimenteira
(Universidade Federal de Minas GeraisUFMG, 2008-12-31)
The industrial cement manufacture process is a combination of chemical, mechanical and thermal steps. It starts on mining activities, and, passes through crushing, grinding, raw meal homogenization, clinquerization, dosing ...
Avaliação e otimização da etapa de moagem primária e remoagem de um minério de ferro itabirítico da região de Morro do Pilar
(Universidade Federal de Minas GeraisUFMG, 2016-01-04)
Determining energy consumption and the mill scale-up has been target of the scientists since the XIX century, starting with Rittinger and Kick. Recently, techniques involving mathematical modeling have been successfully ...
Caracterização tecnológica de materiais estéreis com elevado teor de PPC e P da Mina de Alegria da Samarco Mineração S.A.
(Universidade Federal de Minas GeraisUFMG, 2014-02-20)
Samarco holds a reserve of 3.08 billion tons, the iron formation being cut into ore and waste. Iron formations presenting P and LOI contents lower than 0.097% and 7.7%, respectively, are considered ore. Contents higher ...
Rota de processo para aproveitamento de rochas itabiríticas estéreis da Mina de Conceição
(Universidade Federal de Minas GeraisUFMG, 2005-04-05)
The improvement of materials with low grade is used more and more in the mineral industries. The CVRD in the 90s it began the concentration of the itabirite with the grade close 45% of iron in the Timbopeba Mine (Mariana, ...
Avaliação do comportamento reológico e propriedades mecânicas de compósitos de polipropileno contendo partículas de talco obtidas por diferentes rotas de processamento
(Universidade Federal de Minas GeraisUFMG, 2007-02-27)
The objective of this work was to evaluate the mechanical and reheological properties of polypropylene/talc composites in which the surface of talc has been modified by organosilanes. The talc samples were obtained trough ...
Desenvolvimento de acabamento rolled-on em aço inoxidável
(Universidade Federal de Minas GeraisUFMG, 2009-08-14)
Different kinds of finishes exist for steels, a new one known Rolled-On (RO) could show with different surfaces patterns, with different roughness and gloss. This work presents the development of the RO finishes in 439 ...
Estudo do mecanismo de formação de lascamento em cilindros primeiro intermediärios utilizados em laminadores sendzimir
(Universidade Federal de Minas GeraisUFMG, 2015-03-20)
In this work, the causes of failure in the first intermediate rolls used in Sendzimir rolling mills were studied. Samples of two rolls from different suppliers were analyzed. They had similar chemical composition (0.8% C, ...