Reaction behavior of quartz in gibbsite-boehmite bauxite in Bayer digestion and its effect on caustic consumption and alumina recovery

Wu, Zegang; Lv, Han; Xie, Mingzhuang; Li, Lili; Zhao, Hongliang; Liu, Fengqin

doi:10.1016/j.ceramint.2022.03.141

Cited by 8 publications

(1 citation statement)

References 10 publications

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“…1,2 When producing alumina from bauxite using the Bayer process, the reactive silica is transformed into insoluble sodium aluminosilicate hydrate known as desilication product (DSP), resulting in a severe loss of alumina and caustic soda. [3][4][5] As a result, high-silica bauxite, in which reactive silica is above ∼8%, cannot be economically processed by the conventional Bayer process. 2 With the increase of alumina production, high-grade bauxite is rapidly consumed, leading to an increase in the proportion of high-silica bauxite.…”

Section: Introductionmentioning

confidence: 99%

Extraction of alumina and silica from high-silica bauxite by sintering with sodium carbonate followed by two-step leaching with water and sulfuric acid

Sun

Pan

et al. 2023

RSC Adv.

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Section: Introductionmentioning

confidence: 99%

Extraction of alumina and silica from high-silica bauxite by sintering with sodium carbonate followed by two-step leaching with water and sulfuric acid

Sun

Pan

et al. 2023

RSC Adv.

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Comparison of the effects of Ti- and Si-containing minerals on goethite transformation in the Bayer digestion of goethitic bauxite

Zhou,

Wang,

et al. 2023

Int J Miner Metall Mater

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Characterization Study of some Bauxite Deposits in Northern Brazil

da Rocha Pereira,

Rosset,

de Oliveria Lima

et al. 2023

Clays and clay miner.

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Alumina is produced from bauxite, which contains a mixture of various oxides, such as aluminum (Al), iron (Fe), silicon (Si), and titanium (Ti). Bauxite can also be considered a source of several other valuable metals, such as scandium (Sc), vanadium (V), and gallium (Ga). The composition and mineralogy of alumina determine their economic value, but their characteristics vary by locality. The physicochemical characteristics of bauxites can also be influenced largely by weathering processes, even within the same locality. For this reason, the present study was undertaken with the objective of comparing the characterization data of three bauxite samples collected, which will be referred to as D, E, and F, from the Cruz Alta do Pará plateau in northern Brazil. The samples were solubilized by multi-acid digestion and fusion with lithium metaborate to quantify their metal compositions by inductively coupled plasma optical emission spectrometry (ICP-OES). The mineralogical characterization was conducted by X-ray diffraction (XRD), and the phase changes of minerals in bauxite were detected by thermogravimetric analysis (TGA/DTG). The total organic carbon (TOC) technique was used to quantify the C in the samples, and the moisture content was also measured. Alumina was 30 wt.% on average for all samples, good for producing high-purity alumina by hydrometallurgical processes. The results, however, showed high (~20 at.%) silica concentrations in two samples and ~3 wt.% Fe in one sample, which can pose a challenge in the Bayer process. The X-ray diffraction (XRD) analysis showed that gibbsite (Gbs), kaolinite (Kln), anatase (Ant), and hematite (Hem) were the major mineral phases in these samples. The study showed that the samples from the same mine vary in their metal content, especially with regard to Si, and they, thus, need to be processed selectively to maximize their economic value.

show abstract

Reaction behavior of quartz in gibbsite-boehmite bauxite in Bayer digestion and its effect on caustic consumption and alumina recovery

Cited by 8 publications

References 10 publications

Extraction of alumina and silica from high-silica bauxite by sintering with sodium carbonate followed by two-step leaching with water and sulfuric acid

Extraction of alumina and silica from high-silica bauxite by sintering with sodium carbonate followed by two-step leaching with water and sulfuric acid

Comparison of the effects of Ti- and Si-containing minerals on goethite transformation in the Bayer digestion of goethitic bauxite

Characterization Study of some Bauxite Deposits in Northern Brazil

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