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Rem-revista Escola De Minas
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Published on Jun 1, 2016in Rem-revista Escola De Minas
Ricardo Hundelshaussen Rubio2
Estimated H-index: 2
(UFRGS: Universidade Federal do Rio Grande do Sul),
João Felipe Coimbra Leite Costa9
Estimated H-index: 9
,
Marcel Antônio Arcari Bassani2
Estimated H-index: 2
Estimation of some mineral deposits involves chemical species or a granulometric mass balance that constitute a closed constant sum (e.g., 100%). Data that add up to a constant are known as compositional data (CODA). Classical geostatistical estimation methods (e.g., kriging) are not satisfactory when CODA are used, since bias is expected when estimated mean block values are back-transformed to the original space. CODA methods use nonlinear transformations, and when the transformed data are inte...
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Published on Jun 1, 2016in Rem-revista Escola De Minas
Clayton Pereira Dias1
Estimated H-index: 1
(UFSCar: Federal University of São Carlos),
Oscar Balancin11
Estimated H-index: 11
(UFSCar: Federal University of São Carlos)
The need for materials with higher strength and corrosion resistance in corrosive environments, such as in the oil extraction in saline media, has led to the use of super duplex stainless steels in projects such as the Pre-sal. The manufacture of these materials involves the step of thermomechanical processing, whose performance depends on the workability of the material. Processing conditions in which the super duplex stainless steel UNS S32760 can be worked safely and in which the material can...
2 Citations Source Cite
Published on Jun 1, 2016in Rem-revista Escola De Minas
Geraldo Lúcio de Faria4
Estimated H-index: 4
(UFOP: Universidade Federal de Ouro Preto),
Leonardo Barbosa Godefroid8
Estimated H-index: 8
(UFOP: Universidade Federal de Ouro Preto),
Fernando Victor Nery1
Estimated H-index: 1
(UFOP: Universidade Federal de Ouro Preto)
This paper presents a study about the fracture mechanism of a ferritic stainless steel (UNS S44400 type) during a tensile test. The applied materials for the experimental procedures were 25 specimens of the steel, machined in the rolling direction. Each specimen was submitted to standard polishing procedures. One of the samples, in the original state, was structurally characterized by reflected light optical microscopy. The other samples were submitted to tensile tests with a constant displaceme...
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Published on Jun 1, 2016in Rem-revista Escola De Minas
Renato Reis Oliveira6
Estimated H-index: 6
(USP: University of São Paulo),
Homero Delboni Júnior1
Estimated H-index: 1
(USP: University of São Paulo),
Maurício Guimarães Bergerman1
Estimated H-index: 1
(USP: University of São Paulo)
A pilot scale test program was conducted to evaluate the size reduction performance of HPGR (High Pressure Grinding Rolls) operating in different circuit configurations. For this purpose a series of pilot-HPGR locked cycle tests were performed with medium and high pressures to simulate the HPGR operation in closed circuit with a screen, with partial product recycle, and with edge recycle. Logged instrumentation data such as roller speed, working gap, operating pressure, and power draw were used ...
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Published on Jun 1, 2016in Rem-revista Escola De Minas
Júnia Soares Alexandrino , Antônio Eduardo Clark Peres20
Estimated H-index: 20
(UFMG: Universidade Federal de Minas Gerais)
+ 1 AuthorsOtávia Martins Silva Rodrigues1
Estimated H-index: 1
(UFOP: Universidade Federal de Ouro Preto)
The dispersion degree of the mineral particles in the pulp is especially relevant regarding the performance of the cationic reverse flotation of iron ores. The gangue minerals should remain dispersed while hematite particles should be selectively flocculated. The present study addressed determinations of dispersion degree and zeta potential of hematite in the presence of different dispersants, classified as organic polymeric (natural and synthetic), organic monomeric, and inorganic. Special atte...
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Published on Jun 1, 2016in Rem-revista Escola De Minas
Carlos Barreira Martinez9
Estimated H-index: 9
(UFMG: Universidade Federal de Minas Gerais),
Aloysio Portugal Maia Saliba (UFMG: Universidade Federal de Minas Gerais)+ 2 AuthorsMarcelo Giulian Marques2
Estimated H-index: 2
(UFRGS: Universidade Federal do Rio Grande do Sul)
This study aims to present a methodology for the design of a surface drainage system for dry docks in shipyards, taking into account the rainfall intensity at the site, the damping capacity of the hydraulic structures (drainage channels) and the pumping capacity of the pumping system. A case study of a dry dock owned by Estaleiro Rio Grande, located at the state of Rio Grande do Sul, is presented. The results obtained indicate alternatives for channel and submersible pump sizing. These pumps wou...
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Published on Jun 1, 2016in Rem-revista Escola De Minas
Luiz Tavares dos Santos Junior , Homero Delboni Júnior1
Estimated H-index: 1
(USP: University of São Paulo)
The Santa Rita Mine, located in the State of Bahia, was the first Mirabela Mineracao operation in Brazil. Started in 2009, the nickel sulphide processing plant has undergone constant modifications, aiming to adapt to the changes in the ore. Main modifications included autogenous grinding converted to semi-autogenous, as well as the installation of a desliming stage aiming to remove ultrafine minerals which reduced the nickel recovery in flotation. A full survey and ore characterization campaign ...
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Published on Jun 1, 2016in Rem-revista Escola De Minas
Vanessa de Freitas Cunha Lins12
Estimated H-index: 12
(UFMG: Universidade Federal de Minas Gerais),
Fernando C. Lage1
Estimated H-index: 1
(UFMG: Universidade Federal de Minas Gerais)
+ 2 AuthorsTulio Matencio13
Estimated H-index: 13
(UFMG: Universidade Federal de Minas Gerais)
A practice used to prevent corrosion in buried slurry pipelines is the hibernation of pipelines with an aqueous solution containing corrosion inhibitors before beginning the mining operation. The aim of this work is to evaluate the corrosion resistance of API 5L X70 steel used in the slurry pipelines in hibernation solution containing sodium sulphite, sodium hydroxide and glutaraldehyde in a synthetic river water. The electrochemical techniques used are the Tafel analysis and electrochemical imp...
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Published on Jun 1, 2016in Rem-revista Escola De Minas
Fabrício Mendes Souza3
Estimated H-index: 3
,
Angelo Fernando Padilha21
Estimated H-index: 21
(USP: University of São Paulo)
+ 1 AuthorsDierk Raabe86
Estimated H-index: 86
(MPG: Max Planck Society)
Electron backscatter diffraction (EBSD) and electron channeling contrast imaging (ECCI) were used to examine microstructural changes of the austenitic low-density Fe-30.5Mn-8.0Al-1.2C (8Al) and Fe-30.5Mn-2.1Al-1.2C (2Al) (wt.%) steels during cold rolling. As the strain increased, deformation mechanisms, such as stacking faults, slip, mechanical twinning, and shear banding were activated in both steels cold rolled up to strain of 0.69. Only slip was noted in these steels at low strain (e=0.11) an...
2 Citations Source Cite
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