Mineralogical and Physical–Chemical Characterization of a Bauxite Ore from Lages, Santa Catarina, Brazil, for Refractory Production

Aquino, Thiago Fernandes de; Riella, Humberto Gracher; Bernardin, Adriano Michael

doi:10.1080/08827508.2010.531069

Cited by 12 publications

(9 citation statements)

References 22 publications

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“…The Al 2 O 3 content varies between 49% and 65%, the Fe 2 O 3 content between 18% and 24%, the CaO content between 0 and 5%, the SiO 2 content between 2% and 10%, the TiO 2 content between 0.5% and 3%, while the Cr and Ni content may be as high as 2000 mg/kg. Smaller amounts of magnesium, manganese, vanadium and gallium as well as other elements may be also found [12,13]. Greek bauxites are high grade compared to ores treated in several other parts of the word [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…Beneficiation is often considered for the upgrade of bauxite ores in order to also render them suitable for the refractory/ceramics industry [13,16]. Studies focusing on the removal of iron-bearing minerals include magnetic/gravimetric separation [24][25][26], reductive roasting followed by magnetic separation [17,22,27], froth flotation [28][29][30], leaching of iron oxides [31], chlorination followed by leaching [32] and microwave-magnetising roasting [33].…”

Section: Introductionmentioning

confidence: 99%

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Grinding Behavior and Potential Beneficiation Options of Bauxite Ores

2020

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This laboratory study investigates selective grinding and beneficiation options for a Greek bauxite ore. First, a series of batch grinding tests were carried out in order to investigate the grinding behavior of the ore and the effect of the material filling volume (fc) on the distribution of aluminium- and iron-containing phases. Then, the ground ore was subjected to magnetic separation either as received or after reduction roasting in order to further explore potential beneficiation options. The results showed that grinding of the ore exhibits non-first order behavior, while the breakage rate varies with grinding time. Additionally, Al2O3 tends to concentrate in the coarser than 0.300 mm product fraction, while fc 10% and 2 min of grinding time are considered optimum conditions for good distribution of Al2O3 and Fe2O3. When different product fractions were subjected to magnetic separation, it was seen that the non-magnetic product obtained from the 0.300–1.18 mm fraction was more rich in Al2O3. In this fraction, the Al2O3 content increased from 58 wt% in the feed to 67.9 wt%, whereas the Fe2O3 content decreased from 22.4 wt% in the feed to 13.5 wt%. When the ore was subjected to a two-step treatment, involving reduction roasting followed by magnetic separation, the Fe2O3 grade decreased from 20.8 to 5.1 wt%, but in this case the recovery was very low.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Grinding Behavior and Potential Beneficiation Options of Bauxite Ores

2020

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“…Alüminyum, içerdiği alaşım elementi ve oranına bağlı olarak farklı sınıflara ayrılmaktadır. Temel alaşım elementi çinko olan 7050 alaşımı, başta havacılık endüstrisi olmak üzere yüksek mekanik özellikler gerektiren uygulamalarda sıklıkla tercih edilmektedir [1][2][3]. AA7050 alaşımının mekanik özelliklerini arttırmak için çökelme sertleştirmesi ısıl işlemi uygulanmaktadır.…”

Section: Gi̇ri̇ş (Introduction)unclassified

The Effect of Anodic Coating on Fatigue Performance of AA7050-T7451 Alloy

Akyildiz¹,

Poyrazoğlu

Demirel

2023

Politeknik Dergisi

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“…There are three main structural types of aluminum hydroxide minerals in bauxite: gibbsite (γ-AlO(OH) 3 ), boehmite (γ-AlO(OH)), and diaspore (α-AlO(OH)) [1,2]. Apart from the aluminum minerals, basic components of bauxite also include minerals containing iron, silicon, titanium, calcium, and magnesium [3,4].…”

Section: Introductionmentioning

confidence: 99%

On the Direct Reduction Phenomena of Bauxite Ore Using H2 Gas in a Fixed Bed Reactor

Lazou¹,

Eijk²,

Balomenos³

et al. 2020

J. Sustain. Metall.

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The Bayer Process is the dominant industrial method to produce alumina from bauxite ore. Due to the generation of large amounts of Bauxite Residue (red mud), an alternative method, called the Pedersen Process, is of our interest. This process makes use of a combination of pyrometallurgical and hydrometallurgical techniques in order to prevent the Bauxite Residue generation. In the conventional Pedersen Process, iron in the bauxite is separated in the form of pig iron through a carbothermic smelting-reduction step which has a CO 2 emission similar to that during conventional iron production. In order to eliminate the CO 2 emission of this step, the focus of the present work is to reduce the iron oxides of bauxite ore by hydrogen gas (H 2) prior to smelting and minimizing the use of solid carbon materials for the reduction. The thermochemistry and the kinetics of reactions during calcination and direct reduction of a bauxite ore were studied by a thermogravimetric technique and in situ analysis of the gaseous products. The onset temperatures for the decomposition of bauxite components during calcination were determined. The kinetics of the reduction of hematite to metallic iron was studied and it is shown that the reduction of iron oxides to metallic iron starts at temperatures below 560 °C and it accelerates at higher temperatures. Moreover, it is indicated that the formation of hercynite (FeAl 2 O 4) phase retards the complete reduction at temperatures higher than 760 °C.

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Mineralogical and Physical–Chemical Characterization of a Bauxite Ore from Lages, Santa Catarina, Brazil, for Refractory Production

Cited by 12 publications

References 22 publications

Grinding Behavior and Potential Beneficiation Options of Bauxite Ores

Grinding Behavior and Potential Beneficiation Options of Bauxite Ores

The Effect of Anodic Coating on Fatigue Performance of AA7050-T7451 Alloy

On the Direct Reduction Phenomena of Bauxite Ore Using H2 Gas in a Fixed Bed Reactor

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