Surface characterisation, iron removal and enrichment of bauxite ultrafines

Kuys, K.; Ralston, John; Smart, Roger St. C.; Sobieraj, S.; Wood, R.; Turner, Peter S.

doi:10.1016/0892-6875(90)90036-b

Cited by 12 publications

(4 citation statements)

References 8 publications

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“…(4) Magnetic roasting is a multi-phase reaction process. The reaction between solid phase (iron ore) and gas phase (reducing gas) can be divided into three stages [4].…”

Section: Magnetic Roasting Mechanism Of Hematitementioning

confidence: 99%

Comparison Tests between Magnetic Roasting in a Fluidized Bed and Magnetic Roasting in a Fixed Bed

Zhang

Chen

Liu

et al. 2013

AMR

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This paper discussed the roles of magnetic roasting and the main factors that affect magnetic roasting. Mechanism research of magnetic roasting shows that feed size, roasting temperature, reducing atmosphere and roasting time are the main four factors. Comparison tests of magnetic roasting in a fluidized bed or in a fixed bed have been done. The results show that the appropriate feed size and reducing atmosphere play an important role in roasting. The roasting temperature in a fluidized bed is lower than that in a fixed bed and the roasting time in a fluidized bed is much less than that in a fixed bed. As a result, roasting in a fluidized bed has a higher efficiency of heat and mass transfer than that in a fixed bed.

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“…(4) Magnetic roasting is a multi-phase reaction process. The reaction between solid phase (iron ore) and gas phase (reducing gas) can be divided into three stages [4].…”

Section: Magnetic Roasting Mechanism Of Hematitementioning

confidence: 99%

Comparison Tests between Magnetic Roasting in a Fluidized Bed and Magnetic Roasting in a Fixed Bed

Zhang

Chen

Liu

et al. 2013

AMR

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“…There are many other examples in which the stoichiometry of the metal-deficient sulfide surface suggests reconstruction but this has not been confirmed by diffraction evidence either because this is too difficult to obtain from thin surface layers or because the resulting phase is amorphous. Fe2+/Fe3+; Ni2+/Ni 3+) [6,47]; Intergranular Films and Grain Boundaries.…”

Section: 2 Protonation and Ionmentioning

confidence: 99%

Mechanisms of corrosion in surface layers at solid-solution interfaces

Smart

2001

Ionics

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This review is focussed on solids in the broad categories of oxides, both simple (e.g. binary) and complex (e.g. silicates, aluminosilicates, titanates), and sulfides as ceramics, minerals and surface coatings. Mechanisms of surface reaction, corrosion and leaching associated with protons, hydroxide, water and simple cations and anions are considered. A variety of mechanisms that have some generality in determining the kinetics and reaction products at the solid-solution interfaces is illustrated. The focus of the experimental studies is on the surface layers; their development, distribution of species, depth and control. Mechanisms discussed and illustrated include: diffusion; protonation and ion transfer to solution; lattice reaction; ion exchange (leaching); precipitation; surface oxidation; surface reconstruction; intergranular films and grain boundaries. Theoretical models for the first four mechanisms are presented.

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“…In the last years, various studies on the beneficiation of natural raw materials such as bauxites have been carried out to address this issue. In this context, a reduction in iron content is often the focus of investigations [6,11,12]. Among the various processes investigated, acid leaching processes-especially hydrochloric acid leaching-were particularly promising [13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Tomographic Imaging of Bauxite Grains Leached Using Hydrochloric Acid

2023

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X-ray computer tomography (XRT) is a three-dimensional, nondestructive, and thus reproducible examination method that allows for the investigation of internal and external structures of objects. Due to its characteristics, the XRT technique has increasingly established itself as an alternative examination method and is also applied in the field of mineral processing. Within this work, XRT is used to investigate the influence of hydrochloric acid leaching of iron-rich bauxites on grain composition. Acid leaching is a promising method for the beneficiation of iron-rich bauxites for refractories. Many studies have already established that leaching with hydrochloric acid can reduce the Fe2O3 content in bauxites. However, apart from the influence of the leaching process on the composition of the bauxites, aspects such as the influence of the acid on the exact grain constitution or the porosity behavior have rarely been considered so far. To address these open questions, XRT analysis was used to examine and characterize various bauxites. By comparing identical grains before and after leaching, it was observed that in gibbsite bauxites the acid penetration is deeper, and the volume decreases significantly. In diasporic and boehmitic bauxites, clear leaching edges can be seen in which the iron content has been reduced.

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Surface characterisation, iron removal and enrichment of bauxite ultrafines

Cited by 12 publications

References 8 publications

Comparison Tests between Magnetic Roasting in a Fluidized Bed and Magnetic Roasting in a Fixed Bed

Comparison Tests between Magnetic Roasting in a Fluidized Bed and Magnetic Roasting in a Fixed Bed

Mechanisms of corrosion in surface layers at solid-solution interfaces

Tomographic Imaging of Bauxite Grains Leached Using Hydrochloric Acid

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