Selective recovery of Cr from electroplating nanosludge <i>via</i> crystal modification and dilute acid leaching

Zheng, Jiayi; Lv, Jiaxin; Liu, Weizhen; Dai, Zongren; Liao, Huizhong; Deng, Hong; Lin, Zhang

doi:10.1039/d0en00196a

Cited by 22 publications

(4 citation statements)

References 41 publications

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“…Although this method is simple, it usually produces acid-base waste liquid and consumes a large amount of reducing agent [15]. The physico-chemical extraction method achieves sufficient extraction of Cr by controlling the phase transition of solid particles [16]. Although this method realizes the effective extraction of chromium, it has not been fully explored in the utilization of resources.…”

Section: Introductionmentioning

confidence: 99%

Upcycling of Cr-Containing Sulfate Waste into Efficient FeCrO3/Fe2O3 Catalysts for CO2 Hydrogenation Reaction

Liu,

Chu,

et al. 2024

Materials

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Upcycling Cr-containing sulfate waste into catalysts for CO2 hydrogenation reaction benefits both pollution mitigation and economic sustainability. In this study, FeCrO3/Fe2O3 catalysts were successfully prepared by a simple hydrothermal method using Cr-containing sodium sulfate (Cr-SS) as a Cr source for efficient conversion and stable treatment of Cr. The removal rate of Cr in Cr-SS can reach 99.9% at the optimized hydrothermal conditions. When the synthesized catalysts were activated and used for the CO2 hydrogenation reaction, a 50% increase in CO2 conversion was achieved compared with the catalyst prepared by impregnation with a comparable amount of Cr. According to the extraction and risk assessment code (RAC) of the Reference Office of the European Community Bureau (BCR), the synthesized FeCrO3/Fe2O3 is risk-free. This work not only realizes the detoxification of the Cr-SS but transfers Cr into stable FeCrO3 for application in a catalytic field, which provides a strategy for the harmless disposal and resource utilization of Cr-containing hazardous waste.

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Section: Introductionmentioning

confidence: 99%

Upcycling of Cr-Containing Sulfate Waste into Efficient FeCrO3/Fe2O3 Catalysts for CO2 Hydrogenation Reaction

Liu,

Chu,

et al. 2024

Materials

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“…Currently, the electrowinning method has been developed to selectively recover high-purity Cu from the acid leaching solution of electroplating sludge containing Cu and Ni ( Veglio et al, 2003 ; Wang et al, 2018 ), while Cr plays a negative role in the process which will hinder the utilization of the multi-heavy metal solutions. Therefore, the selective recovery of Cr from electroplating sludge is necessary, but research in this area is scarce ( Yue et al, 2019 ; Zheng et al, 2020 ). Existing research shows that Cr can be selectively recovered by Cr (III) oxidation under high temperature roasting and the subsequent Cr (VI) leaching; the leaching rate of Cr (IV) can reach higher than 90% ( Ding et al, 2008 ; Verbinnen et al, 2013 ).…”

Section: Introductionmentioning

confidence: 99%

Oxidation leaching of chromium from electroplating sludge: Ultrasonic enhancement and its mechanism

et al. 2022

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The oxidation leaching of chromium from electroplating sludge was investigated, and ultrasonication was introduced for the enhancement of the leaching process. Two different types of Cr-bearing electroplating sludge were selected for the study, and the effects of the reagent dosage, temperature, and ultrasonic pulse ratio on the leaching efficiency were tested through oxidation leaching experiments. The experimental results show that hydrogen peroxide and sodium hypochlorite exhibit different leaching effects on different types of electroplating sludge. The control of reagent dosage is crucial for the oxidation leaching of Cr, while the effect of temperature turns out to be small. Hydrogen peroxide turns out to be a more effective oxidizer for chromium sludge, and the leaching efficiency of Cr could be promoted from 77.52% to 87.08% using ultrasonic enhancement under optimum conditions. Interestingly, sodium hypochlorite exhibited better leaching efficiency than hydrogen peroxide for the mixed sludge since the organic matter in the mixed sludge will lead to the rapid decomposition and consumption of hydrogen peroxide. The leaching efficiency of Cr from the mixed sludge could also be promoted from 56.82% to 67.10% using ultrasonic enhancement under optimum conditions. According to the scanning electron microscope imaging, ultrasonic enhancement can create voids and cracks on the surface of the sludge particles, hence promoting the contact between electroplating sludge and leaching agents, and promoting the oxidation leaching efficiency. In addition, ultrasound seems to be able to remove the coverings on the surface of the mixed sludge particles, which may facilitate the oxidation reaction.

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“… Silva et al (2006) oxidized Cr 3+ to Cr 6+ and used the solubility difference between Cr 6+ and Fe 3+ in an alkaline system to achieve separation, however, Cr 6+ is highly toxic. Zheng et al (2020) used crystal modification to recover Cr from electroplating nano sludge. The process control is complex and the crystallinity control is not easy.…”

Section: Introductionmentioning

confidence: 99%

Selective Complex Precipitation for Ferro-Chrome Separation From Electroplating Sludge Leaching Solution

Wang

et al. 2021

Front. Chem.

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In this paper, aiming at the problem of chrome-iron separation in electroplating sludge, the separation of ferrochrome by complexation and precipitation with benzoic acid as complexing agent is achieved. The optimal conditions consisted of a 1: 3 molar ratio of Fe3+: C6H5COOH, a reaction temperature of 30°C, a final pH of 2.5 and a reaction time of 2 min. The separation rate of the iron was 97.38% and the rate of loss of chromium was only 3.59%. The ferrochromium separation products were analyzed by XRD, fluorescence spectroscopy, infrared spectroscopy and H NMR Spectroscopy in order to study the mechanism of precipitation. The results showed that benzoic acid preferentially forms a complex with iron and iron benzoate precipitates with an increase pH. The iron benzoate crystals have a fine particle size, settle rapidly and are easy to filter. The separation of Cr 3+/Fe3+ was successful using our methodology.

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Selective recovery of Cr from electroplating nanosludge via crystal modification and dilute acid leaching

Abstract: Amorphous nanosized particles in electroplating sludge are modified for selective extraction of heavy metals.

Cited by 22 publications

References 41 publications

Upcycling of Cr-Containing Sulfate Waste into Efficient FeCrO3/Fe2O3 Catalysts for CO2 Hydrogenation Reaction

Upcycling of Cr-Containing Sulfate Waste into Efficient FeCrO3/Fe2O3 Catalysts for CO2 Hydrogenation Reaction

Oxidation leaching of chromium from electroplating sludge: Ultrasonic enhancement and its mechanism

Selective Complex Precipitation for Ferro-Chrome Separation From Electroplating Sludge Leaching Solution

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