Chemical and mineralogical characterization of chromite ore processing residue from two recent Indian disposal sites

Matern, Katrin; Kletti, Holger; Mansfeldt, Tim

doi:10.1016/j.chemosphere.2016.04.009

Cited by 43 publications

(35 citation statements)

References 28 publications

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“…Occasionally the manufacture and industrial use of chromium can lead to contamination of groundwater and soils (Burke et al 1991; Puls et al 1999; Geelhoed et al 2002; Whittleston et al 2011; Ding et al 2016; Izbicki and Groover 2016; Matern et al 2016). Natural processes have also lead to elevated chromium concentrations in groundwater above the World Health Organisation maximum for drinking water (50 μg/L; (WHO 2003)) at numerous locations around the world (Robertson 1991; Fantoni et al 2002; Ball and Izbicki 2004; Steinpress 2005).…”

Section: Introductionmentioning

confidence: 99%

“…While this is an obsolete method for producing chromate chemicals, it is only now being phased-out in newly industrialised countries (e.g. India, China and Bangladesh; Darrie 2001; Gao and Xia 2011; Matern et al 2016). As a result, there are numerous problematic legacy sites from this technology around the world (Higgins et al 1998; Geelhoed et al 2002; Stewart et al 2007; Whittleston et al 2011; Matern et al 2017; Zhou et al 2018).…”

Section: Introductionmentioning

confidence: 99%

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Abiotic reduction of Cr(VI) by humic acids derived from peat and lignite: kinetics and removal mechanism

Aldmour

Burke

Bray

et al. 2018

Environ Sci Pollut Res

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Hexavalent chromium contamination of groundwater is a worldwide problem caused by anthropogenic and natural processes. We report the rate of Cr(VI) removal by two humic acids (extracted from Miocene age lignite and younger peat soil) in aqueous suspensions across a pH range likely to be encountered in terrestrial environments. Cr(VI) was reduced to Cr(III) in a first-order reaction with respect Cr(VI) concentration, but exhibited a partial order (~ 0.5) with respect to [H+]. This reaction was more rapid with the peat humic acid, where Cr(VI) reduction was observed at all pH values investigated (3.7 ≤ pH ≤ 10.5). 13 C NMR and pyrolysis GC-MS spectroscopy indicate that the reaction results in loss of substituted phenolic moieties and hydroxyl groups from the humic acids. X-ray absorption spectroscopy indicated that at all pH values the resulting Cr(III) was associated with the partially degraded humic acid in an inner-sphere adsorption complex. The reaction mechanism is likely to be controlled by ester formation between Cr(VI) and phenolic/hydroxyl moieties, as this initial step is rapid in acidic systems but far less favourable in alkaline conditions. Our findings highlight the potential of humic acid to reduce and remove Cr(VI) from solution in a range of environmental conditions. Electronic supplementary material The online version of this article (10.1007/s11356-018-3902-1) contains supplementary material, which is available to authorized users.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Abiotic reduction of Cr(VI) by humic acids derived from peat and lignite: kinetics and removal mechanism

Aldmour

Burke

Bray

et al. 2018

Environ Sci Pollut Res

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“…Ettringite is a hydration product of brownmillerite that may substitute CrO 4 2− for SO 4 2− . It was only detected in the Rania COPR via SEM (Matern et al., 2016). Energy‐dispersive X‐ray (EDX) analyses indicated CrO 4 2− substitution in ettringite crystals.…”

Section: Resultsmentioning

confidence: 99%

“…The substance density was determined by pycnometry. The main physical, chemical, and mineralogical properties of the COPR were described in Matern, Kletti, and Mansfeldt (2016).…”

Section: Methodsmentioning

confidence: 99%

Leaching of hexavalent chromium from young chromite ore processing residue

Matern

Weigand²,

Kretzschmar

et al. 2020

J of Env Quality

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Chromite ore processing residue (COPR) is a waste derived from the chromate extraction from roasted ores and is deposited in some countries in landfills. The objective of this study was to investigate the leaching characteristics of hexavalent Cr [Cr(VI)] from two COPR samples obtained from unlined landfills in the Kanpur area of northern India. Column experiments were conducted under water-saturated conditions to simulate Cr release from the wastes caused by tropical heavy-rain events. Leached Cr(VI) decreased from 1,800 to 300 mg L −1 (Rania site) and 1,200 to 163 mg L −1 (Chhiwali site) during exchange of 12 pore volumes, which approximately corresponds to 2 yr of monsoon precipitation. Flow interruptions for 10, 100, and 1,000 h had little effect on Cr(VI) concentrations in the leachate, suggesting that Cr(VI) leaching was not limited by slow release kinetics. Calcium aluminum chromium oxide hydrates (CAC), and highly soluble phases such as Na 2 CrO 4 may play a role in controlling Cr(VI) concentration in the leachates. The amount of Cr(VI) leached from the columns accounted for 16% of the total Cr(VI) present in both COPR samples. A decrease in the solid-phase Cr(VI)/Cr total ratio along the column was identified by Xray absorption near edge structure (XANES) spectroscopy. Consistently, the smallest Cr(VI)/Cr total ratios were found in the lower column section closest to the inflow. Our results suggest that Cr(VI) leaching from the unlined COPR landfills will continue for centuries, highlighting the urgent need to remediate these dumpsites.Abbreviations: CAC, calcium aluminum chromium oxide hydrate(s); COPR, chromite ore processing residue(s); ICP-OES, inductively coupled plasma optical emission spectrometry; PV, pore volume(s); SEM, scanning electron microscopy; XANES, X-ray absorption near edge structure; XRD, X-ray powder diffraction.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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“…After high-temperature oxidation roasting, chromium oxides are transformed into water-soluble sodium chromate, and the remaining tailings become chromium slag after water leaching [4,5]. However, about 10% of the chromium remains in the chromium slag and contains water-soluble, migratory, and carcinogenic Cr 6+ , which is harmful to the environment [6][7][8]. If it is not recycled or reused, not only are resources wasted, but serious pollution of the environment results, which will have a serious impact on the health of the surrounding residents because of the toxic Cr 6+ content of the slag [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Enrichment Characteristics of Cr in Chromium Slag after Pre-Reduction and Melting/Magnetic Separation Treatment

Wang

et al. 2021

Materials

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Concentrating the chromium in chromium slag and improving the chromium–iron ratio is beneficial for the further utilization of chromium slag. In this paper, chromium slag obtained from a chromite lime-free roasting plant was used as the raw material. Pellets made of the chromium slag and pulverized coal were reduced at different pre-reduction temperatures and then separated by a melting separation process or magnetic separation process, respectively. The mass and composition of the metallized pellets before separation, along with the alloy and tail slag after separation, were comprehensively analyzed. The experimental results showed that the output yield of alloy, iron recovery rate, and chromium content in the alloy were all higher when using melting separation than when using magnetic separation, because of the further reduction during the melting stage. More importantly, a relatively low pre-reduction temperature and selection of magnetic separation process were found to be more beneficial for chromium enrichment in slag; the highest chromium–iron ratio in tail slag can reach 2.88.

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Chemical and mineralogical characterization of chromite ore processing residue from two recent Indian disposal sites

Cited by 43 publications

References 28 publications

Abiotic reduction of Cr(VI) by humic acids derived from peat and lignite: kinetics and removal mechanism

Abiotic reduction of Cr(VI) by humic acids derived from peat and lignite: kinetics and removal mechanism

Leaching of hexavalent chromium from young chromite ore processing residue

Enrichment Characteristics of Cr in Chromium Slag after Pre-Reduction and Melting/Magnetic Separation Treatment

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