scholarly journals Proposal for an Environmentally Sustainable Beneficiation Route for the Amphibolitic Itabirite from the Quadrilátero Ferrífero-Brazil

Minerals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 897
Author(s):  
Gizele Maria Campos Gonçalves ◽  
Rosa Malena Fernandes Lima
Keyword(s):  
Specific Weight ◽  
Gangue Mineral ◽  
Eastern Region ◽  
High Grade ◽  
Environmentally Sustainable ◽  
Quadrilátero Ferrífero ◽  
World Demand ◽  
Iron Formations ◽  
High World ◽  
Economic Use

The high world demand for iron ores opposed to the rapid exhaustion of high-grade deposits from the main producing regions around the world has motivated the search and/or improvement of beneficiation routes, which enable the economic use of iron formations previously considered marginal ores, which have the potential to considerably increase mineable reserves due to their large volume. In this study, a sample of amphibolitic itabirite from the eastern region of the Quadrilátero Ferrífero, Minas Gerais, Brazil was characterized, aiming at its use in the industrial pelletizing circuit. The main physical characteristics of this ore are moisture = 10% and specific weight = 3710 kg/m3. The ore has a high grade of loss on ignition—LOI (6.7%) and P (0.14%). Through X-ray diffractometry (XRD), optical microscopy and scanning electron microscope—SEM, the ore was found to consist of 64.5% goethite (amphibolitic, alveolar, massive and earthy); 6.8% hematite (martitic, granular and lamellar) and 0.9% magnetite. The main gangue mineral is quartz (25.5%). Based on the results of concentration tests (magnetic and flotation) performed with the studied sample, the magnetic concentration route of deslimed sample followed by the addition of slimes in magnetic concentrate can be incorporated into the pelletizing process.

scholarly journals A paleotoca da Serra do Gandarela e seu potencial como geossítio do Geoparque Quadrilátero Ferrífero, Minas Gerais / The paleoburrow of the Gandarela Mountains and its potential as a geosite of the QF Geopark, MG

2014 ◽  
Vol 24 (42) ◽  
pp. 249-263
Author(s):  
Úrsula Azevedo Ruchkys ◽  
Jonathas De Souza Bittencourt ◽  
Francisco Sekiguchi de Carvalho e Buchmann
Keyword(s):  
Preliminary Analysis ◽  
Minas Gerais ◽  
Quadrilátero Ferrífero ◽  
Paleontological Heritage ◽  
Iron Formations

A paleotoca registrada na Serra do Gandarela, Quadrilátero Ferrífero (MG), constitui um importante registro paleontológico da megafauna extinta de mamíferos, semelhante às ocorrências prévias em formações ferríferas no norte de Minas Gerais e em litologias diversas de outras regiões do país. Destaca-se pelas dimensões de 340m de comprimento, o que faz dela a maior paleotoca encontrada até o momento. Este trabalho, realizado sob os auspícios do Ministério Público de Minas Gerais, tem como objetivo avaliar o valor científico, pedagógico e educacional associado a esta ocorrência, visando sua inserção como geossítio do Geoparque Quadrilátero Ferrífero. Esta análise preliminar sugere que a paleotoca da Serra do Gandarela é um exemplo de patrimônio paleontológico com valores que legitimam plenamente sua proposição como sítio paleontológico/geológico do Geoparque Quadrilátero Ferrífero.Palavras-Chave: Paleotoca, megafauna extinta, Serra do Gandarela, Geoparque Quadrilátero Ferrífero. ABSTRACTThe paleoburrow in the Gandarela Mountains, Quadrilátero Ferrífero (MG) is an important record of the extinct megafauna of mammals. This is similar to previous occurrences in iron formations in northern Minas Gerais and in several rocks in other regions of Brazil, but stands out for the dimensions of length 340m, making it the largest paleoburrow found so far. This work has been carried out under the sponsorship of the Minas Gerais Public Prosecutor's Office. The scientific and educational significance of this fossil occurrence is assessed, aiming at its inclusion as a geosite of the Quadrilátero Ferrífero Geopark. This preliminary analysis suggests that this paleoburrow is a valuable example of paleontological heritage, what fully legitimates its proposition as a paleontological/geological site of Quadrilátero Ferrífero Geopark.Keywords: Paleoburrow, extinct megafauna, Gandarela Mountains, Quadrilátero Ferrífero Geopark. 

scholarly journals Associação entre valor cênico, turismo, religião e cultura na paisagem do Quadrilátero Ferrífero, Minas Gerais / Association between scenic value, tourism, religion and culture on the landscape (...)

2014 ◽  
Vol 24 (42) ◽  
pp. 198-218
Author(s):  
Luiz Eduardo Panisset Travassos
Keyword(s):  
Minas Gerais ◽  
Specific Region ◽  
Banded Iron Formations ◽  
Cultural Aspects ◽  
Brazilian Society ◽  
Iron Quadrangle ◽  
Quadrilátero Ferrífero ◽  
Initial Idea ◽  
Iron Formations ◽  
Scenic Value

A ideia para elaboração do presente trabalho surgiu a partir do convite da Sociedade Brasileira de Espeleologia para elaboração de um capítulo sobre o valor cênico, turismo e religião em regiões que apresentam cavernas desenvolvidas em formações ferríferas. A partir da ideia inicial, decidiu-se ampliar o tema para que pudéssemos incluir, também, aspectos culturais da paisagem em uma região específica como a do Quadrilátero Ferrífero (QF), em Minas Gerais. Assim, tem-se como objetivo principal da pesquisa demonstrar a possibilidade de associação entre o valor cênico, turismo, religião e cultura no QF por meio da indicação de exemplos selecionados. Palavras-chave: Valor cênico, turismo, religião, cultura, Quadrilátero Ferrífero ABSTRACTThe idea of this paper emerged after the invitation by the Brazilian Society of Speleology for preparation of a chapter on the scenic value, tourism and religion in regions with caves developed in banded iron formations. From the initial idea, the author decided to expand the theme here so one could include the cultural aspects of the landscape in a specific region such as the Iron Quadrangle (Quadrilátero Ferrífero), in Minas Gerais. Thus, the main objective of this study is to demonstrate the possible association between the scenic value of a landscape together with tourism, religion and culture by indicating selected examples, especially in the QF. Keywords: scenic value, tourism, religion, culture, Quadrilátero Ferrífero

scholarly journals UM MODELO PARA A EVOLUÇÃO MICROESTRUTURAL DOS MINÉRIOS DE FERO DO QUADRILÁTEO FERRÍFERO. PARTE I - ESTRUTURAS E RECRISTALIZAÇÃO

1993 ◽  
Author(s):  
Carlos Alberto Rosière ◽  
Farid Chemale Jr. ◽  
Marcelo L.V. Guimarães
Keyword(s):  
Iron Ore ◽  
Banded Iron Formations ◽  
Lower Proterozoic ◽  
Ore Bodies ◽  
Quadrilátero Ferrífero ◽  
Textural Relationship ◽  
Iron Formations ◽  
Ore District ◽  
Proterozoic Age

In the Quadrilátero Ferrífero iron ore district, the Cauê Formation of the Minas Supergroup comprise banded iron formations, called itabirites, of Lower Proterozoic age enclosing iron rich ore bodies. Although many ore bodies are associated with syntectonic enrichment processes, due to the leaching of gangue minerals like quartz and carbonates, others are probably of sedimentary origin and were recrystallized during the tectonometamorphic development of the region.Three generations of magnetite and four of hematite are recognized in these rocks. They display a clear textural relationship in zones of high and low strain, with the development of two main deformational events under variable metamorphic conditions and different tectonic levels.The first part of this paper one describes the recrystallization phenomena and its relation to the main structures, while in the second part the developed textures and its association to the strain are presented.

Itabirite of Minas Geraes, Brazil

1948 ◽  
Vol 18 (2) ◽  
pp. 86-87
Author(s):  
Stanley A. Tyler
Keyword(s):  
Iron Ore ◽  
High Grade ◽  
Accessory Minerals ◽  
The World ◽  
Iron Formations

Abstract "The mosaic texture and lack of clastic heavy accessory minerals indicate that the quartzose phase of the itabirite is recrystallized chert rather than clastic quartz." Thus this pre-Cambrian high-grade iron ore is more closely related to similar iron formations in other parts of the world.

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