Aluminium Smelting - Reprocessing Of Spent Pot Linings

Aluminium Smelting - Reprocessing of Spent Pot Linings

Oct 10, 2002· Written by AZoM Oct 10 2002 Globally, aluminium smelters produce in excess of 500,000 tonnes of spent pot lining (SPL) each year, and safely disposing of this unavoidable but hazardous waste product is a challenge faced by all aluminium smelters.

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US5352419A - Recovery of aluminium and fluoride values ...

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 salt in such proportions as to dissolve the aluminum ...

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(PDF) Treatment of spent pot-lining for recovery of ...

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...

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Aluminium Production Process | Regain Materials

Over the typical three to ten year life of a pot, materials such as alumina, molten aluminium, calcium, fluorides and sodium infiltrate the cathode lining and cause it to deteriorate. After a defined period, or when indicators determine that the lining is at risk, the lining material is replaced and what is removed from the pot is called Spent ...

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GUIDELINES FOR ENVIRONMENTAL MANAGEMENT OF …

The environmental aspects. of aluminium smelting were first ... 1.4.1 Spent pot linings . 12 : 1.4.2 Dusts and sludges . 12 : 1.4.3 Sklmings and drosses . 13 : 1.5 . ... connected electrically in series and form a pot-line. For example a pot-line is housed in two buildings, each building being 800 m long ...

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EGA starts-up new AED 15 million spent pot lining pre ...

Spent pot lining, the used inner lining of reduction cells in which aluminium is smelted, is one of the most significant waste streams in the aluminium industry. The new facility is an important part of EGA’s ongoing commitment to reducing and re-using industrial waste.

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ENVIRONMENTAL SOLUTION - Alcan plans pot lining recycling ...

Oct 08, 2006· Spent pot lining is the residual material generated in the delining of pots following the aluminum smelting electrolysis process. The spent pot lining is composed of carbon and various inert elements and is typically pre-treated and land-filled under strict precautions. The treatment plant is expected to open its doors in the second quarter of ...

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Total recovery of Spent Pot Liner (SPL) using the Befesa ...

Extracted from the Global Aluminium Industry Sustainability Scorecard •Smelting: •Spent Pot Lining •Objective: Strive to convert all spent pot-lining into feedstocks for other industries, or to re-use and or process all SPL in its own facilities •Applies to: Global Aluminium Industry Solid wastes from the primary aluminium industry

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Smelter Pot Delining and Relining | Pyrotek | Pyrotek

The working lining typically is made of graphitized, graphitic, semi-graphitic or anthracitic carbon cathode blocks. Pot lining life generally extends 1500 to 3000 days but can be reduced if the lining fails prematurely through block cracking, lining erosion, poor operating conditions, etc. Spent pot linings must be removed and disposed.

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EGA - Highest-Ever Levels of Recycling Last Year

Generation of spent pot lining varies because it is generated only when reduction cells require re-lining after several years of operation. EGA is a world leader in the recycling of spent pot lining, one of the largest by-product streams from aluminum smelting. In 2019 EGA sent 46,696 tonnes of spent pot lining to UAE cement plants for use as ...

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Recycling of spent pot linings - Alcan International Limited

fluidized bed combustion of aluminum smelting waste: wo1992012268a1: 1992-07-23: recovery of aluminium and fluoride values from spent pot lining: wo1992013801a1: 1992-08-20: a process for recovering aluminium and fluorine from fluorine containing waste materials: jps5111095a: 1976-01-28: jps53149198a: 1978-12-26

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Optimization in the teratment of Spent Pot Lining and ...

SPENT POT LINING (SPL) ----- 7 2.1.1 Spent Pot Lining (SPL) reactivity and toxicity ... For every tonne of aluminium production, the smelting process consumes about 2 tonnes of alumina, 0.5 tonnes of anode coke, and slight amounts of fluoride

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The Spent Pot Lining Treatment and Fluoride Recycling ...

Spent Pot Lining (SPL) is an unavoidable waste product of the electrolytic process in the smelting of aluminium. SPL is considered to be a hazardous waste in various countries because it contains significant quantities of absorbed fluoride along with traces of cyanide. The disposal of SPL has been primarily in landfill because of difficulties in...

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Spent Pot Lining - Drishti IAS

Spent Potlining is also known as spent pot liner and spent cell liner. The process of extracting aluminium metal from aluminium oxide takes place in electrolytic cells that are known as pots. The pots are made up of steel shells with two linings, an outer insulating or refractory lining and an inner carbon lining that acts as the cathode of the ...

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EGA to start processing spent aluminium smelting pot lining

Spent pot lining is the used inner lining of aluminium smelting pots, which is worn out and replaced every four to five years. It contains both carbon, which is an alternative fuel, and refractory materials that survive the firing process and become part of the finished cement.

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Leaching of spent pot-lining with aluminium nitrate and ...

A study of the leaching behaviour of spent pot-lining (SPL), a hazardous waste generated at the end-of-life of aluminium smelting cells, has been carried out using Al(NO3)3· 9H2O and HNO 3 solutions. Following an initial water wash, a single leaching step using 0.5 M HNO3 and 0.36 M Al(NO3)3 at 60 C extracted a total of 96.3 wt.% of the remaining fluoride, complete extraction of magnesium and ...

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Environmental Guidelines for Aluminum Manufacturing

An aluminum smelter produces 40-60 kg of mixed solid wastes per ton of product with spent cathodes (spent pot/cell linings) being the major fraction. These linings consist of 50% refractory material and 50% carbon. Over the useful life of the linings, the carbon becomes impregnated with aluminum and …

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What is ALUMINIUM SMELTING? What does ALUMINIUM SMELTING ...

Nov 16, 2016· The linings of the pots end up contaminated with cyanide-forming materials; Alcoa has a process for converting spent linings into aluminium fluoride for reuse and synthetic sand usable for ...

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Aluminium waste headache solved | Process Engineering

May 31, 2002· In the processing of spent pot lining, typically operating at around 1250 degrees Celsius, the submerged lance technology has proved ideal for releasing the fluorine contained in the spent pot lining for conversion to other products. The process also …

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Evaluation of spent pot lining (SPL) as an alternative ...

Jan 01, 2019· Spent pot lining (SPL) is a carbonaceous waste from primary aluminum production which could potentially participate in the ironmaking with consolidated raw materials. With that in mind, a SPL first cut sample was characterized aiming its application in the ironmaking industry.

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Mozal SA Aluminum Smelting Project: Aluminum Business and ...

Secondly, Mozal is also addressing the need for adequate treatment of waste from spent pot linings. Electrolytic furnaces must be replaced after their useful life of five years, and the toxic waste that results from the smelting process must be adequately treated before disposal.

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Gainful utilization of spent pot lining - A Hazardous ...

Certified that this Project thesis entitled “Gainful Utilization of Spent Pot Lining-A Hazardous waste from Aluminum Industry” by Sidharth Sankar Parhi (611 CH 306) during the year 2011 - 2014 in partial fulfillment of the requirements for the award of the Degree of Master of Technology (Research) in Chemical Engineering at National Institute

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Photo Of Aluminum Pot Lining Smelting

2017-10-7the 175-million-square-foot building, stretching 40 acres in the heart of the property, once housed the aluminum reduction cells that created the spent pot lining during the aluminum smelting. Read Now; Clay crucible recipes 8 steps

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Alcan to build aluminum spent pot lining recycling plant

Spent pot lining is the residual material generated in the delining of pots following the aluminum smelting electrolysis process. 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 ...

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Sustainable Spent Pot Lining Management Guidance

Mar 16, 2020· When the lining of the pot comes to the end of its life, typically after 4 -7 years, it is classified as spent pot lining (SPL). SPL is typically mix of all a cell lining materials; however, there is a shift in breaking the lininginto the two separate cuts: the first cut (carbon lining, and the second cut refractory liningAlthough ).

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“ENVIRONMENTAL EFFECT OF SPENT POT LINING FROM …

Spent Pot Lining is a waste product from the smelting of aluminium. SPL is considered to be a hazardous waste in various countries because it contains significant quantities of absorbed fluorides along with traces of cyanide. An increasing number of countries are banning the traditional method of landfill disposal of SPL.

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Reprocessing and Recycling of Spent Nuclear Fuel ...

Reprocessing and Recycling of Spent Nuclear Fuel. By seluq 31.10.2020 610. 0. Reprocessing and Recycling of Spent Nuclear Fuel (Woodhead ...

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US5470559A - Recycling of spent pot linings - Google Patents

A process for recycling spent potlining material from aluminum reduction cells contaminated with fluoride and aluminum values. The process comprises first reducing the average particle size of the spent potlining material to smaller than 28 Tyler mesh to form a powder. The powder is then treated with an aqueous sodium hydroxide solution containing about 10 to 60 g/L of sodium hydroxide at a ...

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Spent potlining - Wikipedia

Spent pot lining is an extremely hazardous waste and has long been a problem waste stream for primary aluminium smelters. Due to its hazards, landfill of SPL is banned in many countries.

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AL05 - Environmental Benefits of Using Spent Pot Lining ...

In aluminium production, the cathode and refractory lining of the pot is exhausted after it has spent 4 – 5 years producing aluminium in the pot line. The pot is then taken out of service and the lining material removed becomes spent pot lining. The SPL contains toxic materials such as cyanides and fluorides.

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