Leaching of metals from fresh and sintered red mud

Ghosh, Indrani; Guha, Saumyen; Balasubramaniam, R.; Kumar, Ajit

doi:10.1016/j.jhazmat.2010.09.069

Cited by 92 publications

(37 citation statements)

References 20 publications

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“…Concentrations of As also increase with RM dosage because arsenate does not react with dissolved sulfide. Ghosh et al (2011) found that the total extractable metal by microwave digestion decreased due to sintering, and in this study, Cr concentrations increased after sintering. This increased Cr release may be related to oxidation of Cr(III) present in RMs to more soluble Cr(VI) during sintering.…”

Section: Metal Leaching During Sulfide Removal Process In Aqueous Solsupporting

confidence: 61%

Use of bauxite residue (red mud) as a low cost sorbent for sulfide removal in polluted water remediation

Sheng

Sun

Sun³

et al. 2016

Water Science and Technology

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Abstract:Sulfide is an important pollutant in aqueous systems. Sulfide removal from polluted waters is required prior to discharge. Red mud (RM) is a solid waste of bauxite processing that is rich in reactive iron oxides and consequently has the potential to be used to remove sulfide from aqueous systems. A series of experiments were undertaken using raw and sintered RM to remove sulfide from waters. RM was highly efficient at sulfide removal (average 75% sulfide removal at initial concentration of ~5 mg L -1 , with 500 mg L -1 RM addition) due to both physical adsorption (high specific area) and chemical reaction (with amorphous Fe). Sintered RM, which has a lower surface area and lower mineral reactivity, was much less efficient at removing sulfide (~20% removal under equivalent experimental conditions). Furthermore, concomitant metal release from raw RM was lower than for sintered RM during the sulfide removal process. The results showed that raw RM is a potentially suitable material for sulfide removal from polluted waters and consequently could be used as a low cost alternative treatment in certain engineering applications.

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Section: Metal Leaching During Sulfide Removal Process In Aqueous Solsupporting

confidence: 61%

Use of bauxite residue (red mud) as a low cost sorbent for sulfide removal in polluted water remediation

Sheng

Sun

Sun³

et al. 2016

Water Science and Technology

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“…The characterization of RM was widely investigated before. [14] Mineral phase compositions of RM were investigated several times in our previous works. [7] Although the mineral phase compositions of RM show some discrepancies in different batches, hematite, anatase, quartz, CaCO 3 and α-Al(OH) 3 were frequently detected by XRD.…”

Section: Mineral Phase Compositions Of Rmmentioning

confidence: 99%

Research on red mud treatment by a circulating superconducting magnetic separator

Chen

Wang

et al. 2013

Environmental Technology

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Red mud (RM) accumulated over the years and caused a serious environmental problem. Iron-rich fraction separation is a cost-effective way to reduce the amount of disposal RM. A circulating high-gradient superconducting magnetic separator was produced in this work. Steel wool was filled in the circulating boxes. The boxes were connected by two chains, which moved in and out the magnetic field by a drive motor. The efficiency of iron-rich RM separation by the superconducting magnetic separator was investigated. An amount of 25% (w/w) iron-rich RM fractions with a grade of 65% were separated from the 56% iron content raw RM. The parameters of the steel wool matrix were important in controlling the iron-rich RM magnetic separation. Finer steel wool increased the iron recovery ratio, but decreased the grade of the iron-rich RM concentrates. Microscopic photographs of the RM particles showed that opaque mineral particles were enriched in the collected RM. The particle size distributions of raw, concentrate and residue RM were measured. The increased particle size of concentrate RM implied that large particles were entrapped in the steel wool matrix.

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“…The cost of red mud disposal is relatively high among total production costs. 2 Conventionally, red mud slurry is pumped into clay-lined dams or dykes 3 and allowed to dry naturally. Conventional disposal systems are inexpensive, but the potential impact on surrounding groundwater and environment, and the challenge in surface restoration, may cause significant changes to disposal practices.…”

Section: Introductionmentioning

confidence: 99%