Eco-efficient treatment of hazardous bauxite liquid-residue using acid-activated clays

Dodoo, Daniel; Fynn, Gertrude Ellen; Yawson, Esi Seguwa Chukwufunanya; Appiah, Godfred; Suleiman, Nafiu; Yaya, Abu

doi:10.1016/j.clce.2022.100040

Cited by 3 publications

(17 citation statements)

References 30 publications

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“…The Ghana Bauxite Company Limited in Awaso, Western Region, supplied the bauxite for this research. The chemical properties of the bauxite have been reported in previous work [ 13 ] and are given in Table 1 . All clays were obtained from a local ceramic trader in Saltpond, in the Central Region of Ghana.…”

Section: Methodsmentioning

confidence: 99%

“…To the best of our knowledge, the bauxite-liquid residue can be safely disposed of by treating it with readily available, low-cost adsorbents that can reduce its toxicity to acceptable levels. In this study, acid-activated clays were recommended as the best adsorbent candidates because of their high surface acidity and large adsorption capacity, which could potentially reduce both high alkalinity and toxic compounds [ 12 , 13 ]. Aside from these characteristics, acid-activated clays have (a) large surface areas, (b) are non-toxic, (c) are low-cost, (d) are environmentally friendly, (e) are simple to produce, and (f) have high chemical and mechanical stability [ 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

“…In this study, acid-activated clays were recommended as the best adsorbent candidates because of their high surface acidity and large adsorption capacity, which could potentially reduce both high alkalinity and toxic compounds [ 12 , 13 ]. Aside from these characteristics, acid-activated clays have (a) large surface areas, (b) are non-toxic, (c) are low-cost, (d) are environmentally friendly, (e) are simple to produce, and (f) have high chemical and mechanical stability [ 12 , 13 ]. A previous study [ 13 ] used a batch adsorption system to assess the potential of acid-activated clays to treat bauxite liquid residue in an eco-efficient manner.…”

Section: Introductionmentioning

confidence: 99%

“…Aside from these characteristics, acid-activated clays have (a) large surface areas, (b) are non-toxic, (c) are low-cost, (d) are environmentally friendly, (e) are simple to produce, and (f) have high chemical and mechanical stability [ 12 , 13 ]. A previous study [ 13 ] used a batch adsorption system to assess the potential of acid-activated clays to treat bauxite liquid residue in an eco-efficient manner. The acid-activated clays effectively removed 88%–94% of the total iron while lowering the initial pH value of the bauxite liquid residue (9.93 ± 0.13) by 3.32%–4.53%.…”

Section: Introductionmentioning

confidence: 99%

“…Despite promising results [ 13 ], reproducing and replicating batch adsorption data from a laboratory in an industrial setting is challenging [ 14 ]. Data results from batch experiments are generally inapplicable to most treatment systems in industries where the contact time is not long enough to achieve equilibrium [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Fixed-bed column study for the remediation of the bauxite-liquid residue using acid-activated clays and natural clays

Dodoo¹,

Appiah²,

Acquaah³

et al. 2023

Heliyon

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Fixed-bed column study for the remediation of the bauxite-liquid residue using acid-activated clays and natural clays

Dodoo¹,

Appiah²,

Acquaah³

et al. 2023

Heliyon

Self Cite

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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.

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Comparative study for adsorptive removal of radioactive Cs+, Sr2+ and Co2+ ions from aqueous solution by acid-activated white clay

Kim,

Hwang,

Bae

et al. 2024

Environmental Engineering Research

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Raw white clay was acidified with H2SO4 (2 M) and then activated in a furnace for 2 h at 150oC. The resulting acid-activated clay product was used as an adsorbent for the removal of radioactive substances such as Cs+, Sr2+ and Co2+ ions in aqueous solution. The specific surface area and the pore volume of acid-activated clay were three times higher compared to raw white clay. At 100 mg L- of initial concentration and 1.0 g of dosage, removal efficiencies of Cs+, Sr2+ and Co2+ ions showed 60.0%, 27.3%, and 88.1%, respectively. It was found that the Langmuir isotherm was described well to the adsorption behavior of Cs+, Sr2+ and Co2+ ions on acid-activated clay rather than Freundlich isotherm. The Langmuir isotherm constant (Q) for Cs+, Sr2+ and Co2+ ions was found to be 8.81, 3.78 and 10.20 mg g-1, respectively. Compared to the pseudo-first-order kinetic model, the pseudo-second-order kinetic model was more suitable for adsorption of Cs+, Sr2+ and Co2+ ions in water/acid-activated clay medium owing to the higher correlation coefficient (R2) and the more proximity value of the experimental value qe,exp and the calculated value qe,cal.

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Eco-efficient treatment of hazardous bauxite liquid-residue using acid-activated clays

Cited by 3 publications

References 30 publications

Fixed-bed column study for the remediation of the bauxite-liquid residue using acid-activated clays and natural clays

Fixed-bed column study for the remediation of the bauxite-liquid residue using acid-activated clays and natural clays

Characterization Study of some Bauxite Deposits in Northern Brazil

Comparative study for adsorptive removal of radioactive Cs<sup>+</sup>, Sr<sup>2+</sup> and Co<sup>2+</sup> ions from aqueous solution by acid-activated white clay

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