Removal of Iron-Bearing Minerals From Gibbsitic Bauxite by Direct Froth Flotation

Barbosa, Felipe de Melo; Bergerman, Maurício Guimarães; Horta, Daniela Gomes

doi:10.4322/2176-1523.0924

Cited by 11 publications

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“…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]. Other studies have attempted to upgrade bauxite ores through selective grinding by exploiting the different grindability between the minerals of interest, e.g., diaspore (6.5-7 Mohs hardness) and gangue minerals, e.g., kaolinite (2-2.5 Mohs hardness) and some other aluminosilicates [20,34].…”

Section: Introductionmentioning

confidence: 99%

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%

Grinding Behavior and Potential Beneficiation Options of Bauxite Ores

2020

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“…Bauxite is the main industrial raw material for alumina production. Aluminum hydroxide minerals in bauxite ore mainly composed gibbsite, boehmite and diaspore (Barbosa et al, 2016), there are different crystalline structure in these three minerals (Tabereaux et al, 2014). Diasporic bauxite has a significantly lower Al2O3 content and higher impurities than the gibbsitic bauxite.…”

Section: Introductionmentioning

confidence: 99%

Effect and mechanism on the flotation desulfurization of high-sulfur bauxite by using the mixed collector of PYDH

Li,

Zhang

2024

Physicochem. Probl. Miner. Process.

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Desulfurization of high sulfur bauxite is an important issue in Bayer alumina production. In this study, by using two anionic sulphydryl collectors (HX, HD) as mixed collectors (PYDH), the selectivity of flotation separation between pyrite and diaspore was improved, thereby reducing the sulfur content of high sulfur bauxite and ultimately meeting the production requirements of Bayer alumina. The findings showed that under the optimized conditions of 500 g/Mg collector, 150 g/Mg inhibitor, 200 g/Mg activator, 100 g/Mg foaming agent, and a slurry pH of 9, the sulfur content of bauxite can be reduced from 3.35% to 0.33% through one rough selection, one fine selection, and one scavenging flotation. Moreover, the interaction mechanism between mixed collectors and pyrite was studied through scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), Zeta potential analysis, and contact angle testing. SEM-EDS research confirmed that PYDH adsorbed on the surface of pyrite. The contact angle measurement analysis showed that compared to individual collectors, pretreated pyrite with mixed collectors had better hydrophobicity. Zeta potential, FTIR, and XPS results indicated that PYDH selectively adsorbed pyrite through chemical adsorption. The mixed collector PYDH is an effective collector for pyrite in high sulfur bauxite flotation desulfurization.

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“…Around the world, approximately 95% of bauxite is used to produce alumina [34]. Considering the different raw materials used for bauxite, the methods for alumina production by alkaline process also vary.…”

Section: Introductionmentioning

confidence: 99%

A Review on Comprehensive Utilization of Red Mud and Prospect Analysis

et al. 2019

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Red mud (RM) is a by-product of extracting of alumina from bauxite. Red mud contains high quantities of alkali-generating minerals and metal ions, which can cause significant environmental damage. Many valuable components such as rare-earth elements, Al, and Fe, in RM are difficult to be utilized owing to their particle size and alkalinity. Thus, developing an economical and efficient technology to consume a large amount of RM can efficiently solve RM disposal issues. This paper systematically reviews the comprehensive utilization methods for reducing RM environmental pollution and divides the comprehensive utilization of RM into three aspects: the effective extraction of valuable components, resource transformation, and environmental application. Based on resource, economic, and environmental benefits, the development of new technologies and new processes with market competitiveness, environmental protection, and ecological balance should be the prerequisite for the low-energy, low-pollution, low-cost, and high-efficiency comprehensive utilization of RM. The direction of future research to solve RM disposal issues is also suggested.

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Removal of Iron-Bearing Minerals From Gibbsitic Bauxite by Direct Froth Flotation

Cited by 11 publications

References 0 publications

Grinding Behavior and Potential Beneficiation Options of Bauxite Ores

Grinding Behavior and Potential Beneficiation Options of Bauxite Ores

Effect and mechanism on the flotation desulfurization of high-sulfur bauxite by using the mixed collector of PYDH

A Review on Comprehensive Utilization of Red Mud and Prospect Analysis

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