Aluminium Spent Pot Lining
Aluminium Smelting
The award-winning Alcoa Portland spent smelting pot lining process is the result of a A$26 million collaborative research and development programme between Portland Aluminium, Alcoa, Ausmelt …
Treatment of Spent Pot-lining with Aluminum Anodizing …
Wastewaters generated by the aluminum anodizing industry have been identified as a source of acid, Al3+, and caustic values that could be used for the treatment of spent pot-lining (SPL) generated in primary aluminum smelting. In this paper, recovery of aluminum and fluoride values as an aluminum fluoride product that could be …
Recovery of Carbon and Valuable Components from Spent Pot Lining …
A three-step process was employed to separate cryolite from used carbon cathodes, known as spent pot lining (SPL), and obtain valuable carbon. The process comprised leaching of NaF from the imbedded electrolyte with water, followed by leaching of Na3AlF6, CaF2, and NaAl11O17 with acidic anodizing wastewater, and then …
Recovery of carbon rich material:-Recycling of spent pot lining…
Spent pot lining (SPL) is a carbon rich material generated during primary aluminium smelting process. The major constituents of SPL are carbon (40–50%), fluoride (10–18%), aluminium (10–13%), cyanide (700–4500 ppm) and sodium (12–16%) along with other metals like calcium, iron, lithium, titanium and magnesium in trace amounts.
Developing Guidance to Support Sustainable Spent …
ALUMINUM: RECYCLING AND CARBON / ENVIRONMENTAL FOOTPRINT Developing Guidance to Support Sustainable Spent Pot Lining (SPL) Management Across the Aluminum Industry PERNELLE NUNEZ1,2 1.—International Aluminium Institute, 2 Duke Street St James's, London SW1Y 6BN, UK. 2.—e-mail: nunez@world-aluminium …
Green and efficient separation of fluorine from spent aluminum
Leaching of spent pot-lining with aluminium nitrate and nitric acid: effect of reaction conditions and thermodynamic modelling of solution speciation. Hydrometallurgy, 134–135 (2013), pp. 132-143, 10.1016/j.hydromet.2013.02.011. View PDF View article View in Scopus Google Scholar
Process for stabilizing fluorine in electrolytic aluminum spent pot
Electrolytic aluminum Spent Pot Lining (SPL) contains excess soluble fluoride, which can cause harm to the environment and human body when it seeps into the ground with rainwater. Therefore, it is necessary to convert the soluble fluoride into a chemically stable insoluble substance. In order to stabilize the fluoride ions of soluble …
The SPL Waste Management Challenge in Primary Aluminum
"Alba Names Australia's Regain as Technology Partner for Spent Pot Lining Treatment Plant," Aluminium Insider, December 24, 2019. Banker, D.B., et al., "Detoxification of aluminum spent potliner by thermal treatment, lime slurry quench and post-kiln treatment," U.S. Patent 5164174A, Reynolds Metals Co., 1991.
Spent Pot Lining Characterization Framework | Request PDF …
The defluorination characteristics of spent pot lining, which is a hazardous waste from aluminum electrolysis, were studied using acidic iron-containing solution.
Green and efficient separation of fluorine from spent aluminum
Shi et al. [14] used a two-step alkaline-acid leaching process to treat spent pot lining. The recovery of Na 3 AlF 6 and Al 2 O 3 was 65.0 % in the alkali (2.5 mol/L NaOH) leaching process, and other components are recovered …
Recycling of spent pot lining (SPL) from aluminum smelters …
Spent pot lining (SPL) is a solid waste produced at the end of life of aluminum reduction cells. SPL is hazardous to the environment due to fluoride and cyanide compounds and is classified as toxic waste. Recovering the fluorine compounds in SPL can be used to eliminate the toxicity in these wastes and return part of the production costs, …
Recovery of aluminium and fluoride values from spent pot lining
Process for the recovery of aluminum and fluoride values from spent pot lining materials comprising the steps of calcining spent pot lining material to produce an ash having environmentally acceptable levels of cyanide contamination, subjecting the ash to a leaching step in a solution containing a mineral acid and a corresponding aluminum …
Developing Guidance to Support Sustainable Spent Pot Lining …
Spent pot lining (SPL) is a solid waste generated from primary aluminum production, and its management has posed a challenge for the aluminum industry for many years. SPL is classified as a hazardous waste or is subject to strict regulations in most jurisdictions due to its fluoride and cyanide content 1, 2 .
Landfilling of produced spent pot liner in aluminium …
The cotreatment of spent pot-lining (SPL), a high fluoride (20 wt %), and cyanide (up to 1 wt %) waste generated in aluminum smelting, and Al3+ wastewaters generated by the aluminum anodizing ...
Recycling graphite from waste aluminium smelter Spent Pot …
Spent Pot Lining (SPL) is a by-product from the aluminium smelting process and is produced at a rate of 22–25 kg per Tonne of metallic Al generated (Holywell and …
Press Releases
New Delhi; 14 th December 2023: On National Energy Conservation Day, Vedanta Aluminium, the largest aluminium producer in India, announces a significant new breakthrough in the lining design of the 'pots' at its aluminium smelters. These smelters house several potlines, which are long buildings within the smelter that contain a series …
Recycling of Spent Pot Lining First Cut from Aluminum …
The production of primary aluminum from molten salt electrolysis has brought about some environmental problems, among which spent pot lining (SPL) is one of the most prominent. The service life of aluminum electrolytic cells is generally 5–8 years [1,2]. About 30 kg of SPL is discharged per tonne of primary aluminum produced .
What do you know about Spent Pot Lining?
Spent Pot Lining (SPL) is a solid waste generated during the production of primary aluminium. Aluminium is produced in lined steel pots.The lining of the pot is typically made of two layers – an ...
(PDF) Gainful utilization of spent pot lining
PDF | Spent Pot Lining (SPL) or Spent Cathode is a solid waste produced by the aluminum industry during the manufacture of aluminum metal in... | Find, read and cite all the research you need on ...
केंद्रीय प्रदूषण नियंत्रण बोर्ड
Spent pot Lining (SPL) generated from Primary Aluminium Smelting Industries 32.0 Utilization of Spent Pot Lining (SPL): Source Of eneration Spent Pot Lining (SPL) - During production of Primary Category. I I of Schedule-I Aluminium from Alumina of HOWM Rules, 2016 Smelting Industries 32.1 Source of Waste Recove /Product For …
Recovery of carbon and cryolite from spent pot lining of aluminium …
The cryolite precipitating rate is 95.6%, and the purity of Na 3 AlF 6 obtained is 96.4%. Key words: spent pot lining; recovery; chemical leaching; aluminium electrolysis 1 Introduction With a rapid development of the primary aluminium industry, more and more spent pot lining (SPL) is accumulated and needs to be dealt with.
The Legacy of Spent Potliner – Cost or Opportunity?
Primary aluminum smelters have spent many millions on improved pot linings, squeezing the last available drop from the energy efficiencies in cathodes, ramming materials, and collector bar design. But when it comes to the end of a pot's life, this high-tech material is scooped out and thrown away as a waste.
Economic and Environmental Alternative for Destination of Spent Pot
The residue from the demolition of electrolytic cells for the production of primary aluminum is the Spent Potlining (SPL). This material is classified as Class I (non-inert — traces of cyanide) waste. Among the possibilities of neutralizing the SPL there are...
Recycling of spent pot lining (SPL) from aluminum smelters …
Spent pot lining (SPL) is a solid waste produced at the end of life of aluminum reduction cells. SPL is hazardous to the environment due to fluoride and …
Microstructure Characterization of Cement Pastes with Recycled Aluminum
Spent pot lining (SPL), a by-product of the aluminum industry, is massively produced worldwide. SPL treated with the low caustic leaching and process (LCLL-ash) is no more hazardous and can be used as cementitious material.
Defluorination of spent pot lining from aluminum electrolysis …
Spent pot lining (SPL) is a hazardous waste produced during the Hall−Heroult process in the electrolytic aluminum industry (Xiao et al., 2018a).During the electrolytic reduction process, the electrolyte (e.g., Na 3 AlF 6, AlF 3, CaF 2, LiF), molten aluminum, and other corrosive substances continuously infiltrate into the carbonaceous …
Extraction and recycling of fluoride-containing phase from spent …
There are a lot of research or methods on the comprehensive utilization of solid waste in the aluminum electrolysis industry, such as spent pot-lining, carbon dust, and spent aluminum electrolyte. In recent years, pyrometallurgical and hydrometallurgical methods were performed for the treatment of solid wastes [20], [21].
Combustion and emissions analysis of Spent Pot lining (SPL…
Spent Pot lining (SPL) is a carbonaceous material generated during the primary aluminum smelting process. SPL is a hazardous waste but the high energy density (carbon rich fraction) and good environmental impacts (toxic materials such as cyanides are destroyed at temperature well above 1000 °C) of the treated SPL (water washed …
Synergistic reutilization of red mud and spent pot lining for
The production of aluminum from bauxite requires two main steps: refining through the Bayer process, and smelting through electrolysis (Mihajlović et al., 2014).This route produces two main solid residues: red mud (RM) at the refinery and spent pot lining (SPL) at the smelter.
Recovery of fluoride values from spent pot-lining: …
Treatment of spent pot-lining (SPL) from aluminium smelting cells by a two-stage leaching scheme comprising a water wash and an Al 3+ leach and fluoride recovery as an aluminium hydroxyfluoride product has been studied for extraction of fluoride and then recovery as smelter grade AlF 3.The NaF content of a −1.18 mm size fraction was …
Aluminium Smelting
This new spent pot lining treatment process eradicates the largest environmental problem in the aluminium industry and avoids landfill and the potential for future liabilities from leachate contamination of …
WO1992012268A1
Examples of processes aimed at recovering aluminium fluoride from spent pot lining materials are to be found in U.S. Patents 4,508,689 Bush et al, 4,597,953 Bush and 4,889,695 Bush. In these processes, the pot lining material is crushed and leached to extract the fluoride and aluminium values. However, the processes described in the …
Developing Guidance to Support Sustainable Spent Pot …
ALUMINUM: RECYCLING AND CARBON / ENVIRONMENTAL FOOTPRINT Developing Guidance to Support Sustainable Spent Pot Lining (SPL) Management Across the …
Alcan to build aluminum spent pot lining recycling plant
The spent pot lining is composed of carbon and various inert elements and is typically pretreated and land-filled under strict precautions. Through this new process, all of the spent pot lining will be recyclable, providing the global aluminum industry a sustainable reusable solution for spent pot lining's byproducts.
The SPL Waste Management Challenge in Primary Aluminum
Ouellet-Plamondon, C., et al., "Valorization of Treated Spent Pot Lining By-Product in Concrete," TRAVAUX 49, Proceedings of the 38 th International ICSOBA …
Spent Pot Lining: An Introduction Factsheet
The Spent Pot Lining Factsheet explains how SPL is produced, its availability and its use – and is presented in a simple and clear format to help inform the intended audience about the importance and usage of …
Environmental Benefits of Using Spent Pot Lining (SPL) in …
Spent pot lining (SPL) is a toxic waste material produced during the pot replacement process in the aluminium industry. This paper presents a comprehensive environmental assessment of a case study in the United Arab Emirates (UAE), where SPL from Emirates Global Aluminium (EGA) was used as a feedstock at a cement plant in …
Recycling of spent pot lining of electrolysis cells with …
The spent pot lining (SPL) of aluminum cell is one of the most environmentally hazardous waste of the aluminum industry due to its content of up to 40 wt. % fluorides. At present most of the SPL ...