Kinetics of fluoride removal from spent pot liner leachate (SPLL) contaminated groundwater

Sleap, Scott B.; Turner, Brett D.; Sloan, Scott W.

doi:10.1016/j.jece.2015.09.004

Cited by 44 publications

(5 citation statements)

References 18 publications

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“…Indeed, this factor compelled us to choose a more expensive chelating resin for the intended purpose, as in solutions of high ionic-strength, the loaded species of a conventional strong acid cation exchanger would be displaced by other cations in the aqueous waste, according to concentration gradients and order of selectivity, hence ruining the fluoride affinity of the resin. The only studies on actual SPL industrial leachate used calcite as a sorbent and focussed on modelling the kinetics of the uptake process [30,31]. To the best of our knowledge, no work exists on the selective removal of fluoride from leachate of SPL via metal-loaded chelating resin.…”

Section: Introductionmentioning

confidence: 99%

Highly efficient fluoride extraction from simulant leachate of spent potlining via La-loaded chelating resin. An equilibrium study

Robshaw

Tukra²,

Hammond

et al. 2019

Journal of Hazardous Materials

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Spent potlining (SPL) hazardous waste is a potentially valuable source of fluoride, which may be recovered through chemical leaching and adsorption with a selective sorbent. For this purpose, the commercially available chelating resin Purolite S950+ was loaded with lanthanum ions, to create a novel ligand-exchange sorbent. The equilibrium fluoride uptake behaviour of the resin was thoroughly investigated, using NaF solution and a simulant leachate of SPL waste. The resin exhibited a large maximum defluoridation capacity of 187 ± 15 mg g from NaF solution and 126 ± 10 mg g from the leachate, with solution pH being strongly influential to uptake performance. Isotherm and spectral data indicated that both chemisorption and unexpected physisorption processes were involved in the fluoride extraction and suggested that the major uptake mechanism differed in each matrix. The resin demonstrates significant potential in the recovery of fluoride from aqueous waste-streams.

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Section: Introductionmentioning

confidence: 99%

Highly efficient fluoride extraction from simulant leachate of spent potlining via La-loaded chelating resin. An equilibrium study

Robshaw

Tukra²,

Hammond

et al. 2019

Journal of Hazardous Materials

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“…4 SCC contains many valuable inorganic compounds, 5 such as alumina, cryolite, uoride and aluminosilicate, and some carbon blocks also have a small amount of cyanide. 6,7 In the past, SCC was usually directly landlled. 8 However, since the uoride and cyanide in SCC can penetrate the soil and pollute the groundwater, having a great impact on the health and ecological balance of animals and plants, 9,10 many countries have listed SCC as a hazardous solid waste.…”

Section: Introductionmentioning

confidence: 99%

Study on ultrasonic leaching and recovery of fluoride from spent cathode carbon of aluminum electrolysis

Wang

Mao

2023

RSC Adv.

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“…Furthermore, landfills are subject to the operation and maintenance requirements of environmental protection policies, including maintaining groundwater monitoring, maintaining and monitoring leak detection systems, and operating the leachate collection and removal systems, which require extremely high operating costs. 7 Most importantly, the landfill of SCC is bound to be accompanied by long-term environmental pollution risks, 56 while large amounts of graphitized carbon and electrolyte resources are left unused. Consequently, disposal of SCC in landfills is commonly considered the least preferable solution.…”

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confidence: 99%

Detoxification and Recovery of Spent Carbon Cathodes via NaOH–Na₂CO₃ Binary Molten Salt Roasting–Water Leaching: Toward a Circular Economy for Hazardous Solid Waste from Aluminum Electrolysis

Yao

Xiao

Mao

et al. 2020

ACS Sustainable Chem. Eng.

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The conversion of solid waste into secondary resources has become a prerequisite for the sustainable development of the industry. This study focused on the development of the detoxification process for spent carbon cathode (SCC) without environmental pollution risks and the exploration of the recycling direction of recovered carbonaceous materials. First, the mechanism of thermodynamic conversion and decomposition of toxic substances was explored. Parameters of NaOH–Na2CO3 binary molten salt roasting were optimized through an orthogonal design and a single-factor experiment, and gas release behavior during detoxification treatment was investigated. Results showed that most of the fluoride and cyanide were dissociated and decomposed, and the leaching concentration of fluoride and cyanide was as low as 7.58 and 0.12 mg/L after detoxification treatment, respectively. Then, a multistage recovery process of fluorine from fluorine-containing leachate was designed, and the comprehensive utilization of exhaust gas and the recycling of the reaction reagent were realized simultaneously. The possibility of recovering graphitized carbon blending to prepare carbon anodes was discussed in detail, and the catalytic mechanism of main impurity elements on the O2/CO2 reactivity of carbon anodes was investigated via density-functional-based tight binding (DFTB). The results showed that the Boudouard reaction and carbon–O2 reaction were affected because of the presence of Ca or Na, and the recovered graphitized carbon with a low blending ratio was more suitable for the preparation of carbon anodes. Finally, an economic benefit analysis was conducted to evaluate the industrial application potential of the proposed detoxification treatment. Compared with landfills, the proposed process reduced the disposal cost while eliminating environmental pollution risks and realized the on-site recovery and reuse of valuable components, showing considerable environmental and economic benefits.

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Kinetics of fluoride removal from spent pot liner leachate (SPLL) contaminated groundwater

Cited by 44 publications

References 18 publications

Highly efficient fluoride extraction from simulant leachate of spent potlining via La-loaded chelating resin. An equilibrium study

Highly efficient fluoride extraction from simulant leachate of spent potlining via La-loaded chelating resin. An equilibrium study

Study on ultrasonic leaching and recovery of fluoride from spent cathode carbon of aluminum electrolysis

Detoxification and Recovery of Spent Carbon Cathodes via NaOH–Na₂CO₃ Binary Molten Salt Roasting–Water Leaching: Toward a Circular Economy for Hazardous Solid Waste from Aluminum Electrolysis

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Kinetics of fluoride removal from spent pot liner leachate (SPLL) contaminated groundwater

Cited by 44 publications

References 18 publications

Highly efficient fluoride extraction from simulant leachate of spent potlining via La-loaded chelating resin. An equilibrium study

Highly efficient fluoride extraction from simulant leachate of spent potlining via La-loaded chelating resin. An equilibrium study

Study on ultrasonic leaching and recovery of fluoride from spent cathode carbon of aluminum electrolysis

Detoxification and Recovery of Spent Carbon Cathodes via NaOH–Na2CO3 Binary Molten Salt Roasting–Water Leaching: Toward a Circular Economy for Hazardous Solid Waste from Aluminum Electrolysis

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Detoxification and Recovery of Spent Carbon Cathodes via NaOH–Na₂CO₃ Binary Molten Salt Roasting–Water Leaching: Toward a Circular Economy for Hazardous Solid Waste from Aluminum Electrolysis