Aplicação de prensas de rolos em minério de ferro

Ribeiro, Farley Santos; Russo, José Francisco Cabello; Costa, Thiago A.

doi:10.1590/s0370-44672010000200027

Cited by 7 publications

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“…In the present work, the CAPEx was higher for the conventional route, mainly due to the costs in the ancillaries, primarily conveyor belts, electromechanical assembly, and industrial civil works. Route #2 presented a reduction of 10% in CAPEx compared to the conventional route, which agrees with estimates by Ribeiro et al [31] in a trade-off study on the application of roller presses (HPGR) compared to tertiary cone crushing and screening. In this study, the authors demonstrated a reduction of approximately 8% in comparison to the CAPEx.…”

Section: Resultssupporting

confidence: 88%

“…On the one hand, the moisture content of the ore can affect the performance of the HPGR if it is excessively high, which can lead to a higher wear rate of the rolls, alongside a reduction in throughput. Ribeiro et al [31] demonstrated that a pilot-scale HPGR processing a similar itabirite iron ore can lose up to 10% of its throughput when the moisture content of the ore reaches values as high as 9%. This is expected to be even more critical in the case of Route #4, given the sensitivity of the VRM process in dealing with moist feed.…”

Section: Resultsmentioning

confidence: 99%

“…The wear rate of HPGR rolls and studs was estimated assuming a lifetime of 4000 h for the rolls, based on the work of Ribeiro et al [31] with a similar ore and assuming a stud pattern of the rolls similar to the one used in the Los Colorados plant [32]. Additionally, it was considered that the end of the useful life for the rolls is achieved at about 25 mm wear [32], and the wear rate was calculated considering no corrosion wear, formation of an autogenous layer of material between the studs, and uniform wear on the surface of studs without premature failures.…”

Section: Consumables Estimationmentioning

confidence: 99%

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Holistic Pre-Feasibility Study of Comminution Routes for a Brazilian Itabirite Ore

2021

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Comminution is an essential step in processing itabirite ores, given the need to liberate silica and other contaminants from the iron minerals for downstream concentration and then pellet feed production. In general, these ores in Brazil are not particularly hard to crush and grind, but both capital (CAPEx) and operating (OPEx) expenditures in this stage of preparation can be critical for the project, in particular due to uncertainties in iron ore prices. Several circuits have been designed and are in operation for this type of ore in Brazil; however, it is not yet clear which technologies are more cost-effective and in which configuration they should be applied. This work critically analyzes four comminution circuits for an undisclosed case study. For these circuits, CAPEx, OPEx, and some environmental sustainability indices, as well as qualitative technical criteria, were used in the comparisons. This work concludes that two of these process routes, especially those based on more energy-efficient technologies (and one of these still rarely explored even at bench-scale), have demonstrated to be very attractive from multiple standpoints.

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Section: Consumables Estimationmentioning

confidence: 99%

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Holistic Pre-Feasibility Study of Comminution Routes for a Brazilian Itabirite Ore

2021

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“…O projeto Minas-Rio emprega Prensas de Rolos na etapa de pré-moagem, substituindo as etapas de britagem terciária e quaternária. Essa escolha foi baseada principalmente na redução do custo de investimento e do consumo energético, na maior estabilidade da operação e na simplificação do circuito, que a prensa de rolos proporciona [2]. A Prensa de Rolos (Figura 1) consiste em dois rolos girando em sentidos opostos: um deles gira sobre um eixo fixo, enquanto o outro se movimenta linearmente.…”

Section: Introductionunclassified

Comparação De Modelos Matemáticos Na Prensagem De Rolos De Minério De Ferro Itabirítico

Campos¹,

Barrios²,

Segura-Salazar³

et al. 2016

ABM Proceedings

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ResumoA tecnologia da Prensa de Rolos se encontra cada vez mais presente em circuitos de cominuição na indústria mineral. No caso de minérios de ferro itabiríticos, essa tecnologia está sendo aplicada de forma pioneira no projeto Minas-Rio, atualmente em fase de ramp-up. O trabalho compara o desempenho das Prensas de Rolos do circuito Minas-Rio sob diferentes condições de operação em relação às previsões obtidas pelos três principais modelos matemáticos disponíveis na literatura: Morrell / Lim / Shi / Tondo (1997), Torres & Casali (2009) e Dundar et al. (2013. A comparação foi realizada considerando o ajuste dos modelos a um caso base, sendo os demais testes simulados a partir dos parâmetros ajustados para esse. A comparação entre os modelos foi realizada com base nas previsões de potência consumida, capacidade e distribuição granulométrica do produto. Em geral, foram obtidas boas previsões da distribuição granulométrica do produto com os diferentes modelos, embora o modelo de Morrell / Lim / Shi / Tondo tenha superestimado a finura do produto em alguns dos testes. Além disso, foi observada uma boa correspondência entre a potência experimental e a simulada para os três modelos na maioria dos testes industriais. Entretanto, a capacidade prevista pelos modelos de Morrell / Lim / Shi / Tondo e Torres & Casali foi subestimada em todos os casos em relação aos valores experimentais. Palavras-chave: Prensa de rolos; Moagem; Simulação; Minério de ferro itabirítico. COMPARISON OF MATHEMATICALS MODELS IN HIGH PRESSURE GRINDING ROLLS OF AN ITABIRITE IRON ORE AbstractHigh Pressure Grinding Rolls technology is increasingly more present in comminution circuits in the minerals industry. In the case of Itabirite iron ore, this technology is being applied for the first time in the Minas-Rio project, currently in ramp-up phase. The present work compares the performance of the Minas-Rio's roller presses under different operating conditions in relation to the predictions obtained by the three main mathematical models available in the literature: Morrell / Lim / Shi / Tondo (1997), Torres & Casali (2009) and Dundar et al. (2013). The comparison was made considering the fitting of the model parameters using a base case, and simulating the other cases using the calibrated parameters. A comparison of the models was performed based on predictions of power consumption, capacity and size distribution of the product. In general, simulations were in good agreements with the size distribution of the product for the different models, although the model by Morrell / Lim / Shi / Tondo has overestimated the fineness of the product in some of the tests. Furthermore, a good correlation was observed between the experimental and simulated power for the three models in most of the industrial tests. However, the capacity predicted by models Morrell / Lim / Shi / Tondo and Torres & Casali was underestimated in all cases compared to the experimental values.

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Iron Ore Concentrate Particle Size Controlling Through Application of Microwave at the HPGR Feed

Athayde

Bagatini

2018

Mining, Metallurgy & Exploration

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Aplicação de prensas de rolos em minério de ferro

Cited by 7 publications

References 0 publications

Holistic Pre-Feasibility Study of Comminution Routes for a Brazilian Itabirite Ore

Holistic Pre-Feasibility Study of Comminution Routes for a Brazilian Itabirite Ore

Comparação De Modelos Matemáticos Na Prensagem De Rolos De Minério De Ferro Itabirítico

Iron Ore Concentrate Particle Size Controlling Through Application of Microwave at the HPGR Feed

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