Analytical Methods of Researching the Aluminium Electrolysis cell Fulfilled Lining Samples

Somov, Vladimir V.; Nemchinova, N. V.; Korepina, N. A.

doi:10.17516/1999-494x-2017-10-5-607-620

Cited by 6 publications

(6 citation statements)

References 2 publications

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“…According to previous research conducted by the authors the carbon part of the spent linen also contains K1,44Al10,88O17,23 (potassium aluminate), CaF2 (fluorite), Na5Al3F14 (chiolite), Al (aluminum), Fe(Fe1.24Ti0.61)O4 (titanomagnetite) [15]. Chemical composition of the spent coal lining for every electrolyzer is individual and depends on its service length, type and capacity of the bottom, electrolysis technological process, bottom assembly quality and start.…”

Section: Resultsmentioning

confidence: 89%

Ways of Solving the Ecological Problem of Alluminium Smelting Hard Waste Disposa

Somov¹,

Nemchinova²,

Tyutrin³

2019

Proceedings of the VIII Science and Technology Conference “Contemporary Issues of Geology, Geophysics and Geo-Ecology of the No

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Chemical composition and main physical-chemical characteristics (apparent density, electrical resistivity, thermal conductivity, compression strength) carbon cathode block samples of spent lining for aluminium electrolysis unit produced by OJSC "RUSAL Krasnoyarsk"; it is shown that to increase the bath service life it is necessary to form a crust to decrease alumina-cryolite melts penetration into electrolysis carbon cathode blocks which will reduce environmental impact.

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Section: Resultsmentioning

confidence: 89%

Ways of Solving the Ecological Problem of Alluminium Smelting Hard Waste Disposa

Somov¹,

Nemchinova²,

Tyutrin³

2019

Proceedings of the VIII Science and Technology Conference “Contemporary Issues of Geology, Geophysics and Geo-Ecology of the No

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“…According to earlier analytical studies of the chemical composition of the carbon SPLs provided by the RUSAL Krasnoyarsk JSC (Fig. 1), the main fluorine-containing compounds are cryolite, chiolite, and sodium and calcium fluorides [17]. As is known, these compounds (except for fluoride CaF2) actively interact with an alkaline solution, while allowing fluorine to be maximally recovered to the solution [18,19].…”

Section: Research Objectivementioning

confidence: 95%

Hydrometallurgical Processing of Spent Carbon Lining to Extract Valuable Components for Cryolite Production

Nemchinova

2021

SSP

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The technique of mathematical modeling using the Selector software package has been applied to study the leaching of fluorine from the carbon part of the aluminum electrolysis cell spent lining. Based on the model obtained, the effects of the solvent (caustic soda Na2Oку) concentration and the ratio of liquid and solid phases in the pulp on the fluorine extraction have been assessed. The research object was the lining samples by the RUSAL Krasnoyarsk JSC. A thermodynamic assessment of the spent carbon lining components behavior during the alkaline processing has been performed with the introduction of three solvent concentrations into the model: 12.5, 17.5, and 25.0 g/dm3. According to the model solutions, the maximum fluorine extraction (up to 90 %) is achieved when using a reagent with the Na2Oку concentrations of 12.5 and 17.5 g/dm3 and a liquid to solid ratio of 8.5÷10:1. Using the model, the phase composition of the cake and the forms, in which fluorine remains in the solid residue (cake), have been determined. Laboratory studies confirm the convergence of the simulation results with the experimental data: solutions have been obtained to crystallize out cryolite (with fluorine and silica content of 50–53 % wt. and 0.11÷0.53 % wt., respectively), which is in demand in the electrolysis of cryolite-alumina melts.

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“…According to research data [14][15][16][17][18] Modern recycling methods of the SPL carbon part are aimed at extracting valuable components from it in order to prepare chemical entities (calcium fluoride [19], cryolite [20]), being brought back to electrolysis, its usage as fuel [13,21] or in ferrous metallurgy as flux [22].…”

Section: Recycling Methods Of Spent Pot Liningmentioning

confidence: 99%

Study of Influence of Parameters of Leaching Fluorine from Spent Pot Lining

Nemchinova

Tyutrin

Somov

2019

MSF

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In aluminium preparation by means of electrolysis of alumina-cryolite melts one of the largest-scale type of industrial waste is spent pot lining (SPL). Chemical composition of SPL carbon part consists of various elements with fluorine as the main one. One of the solutions of the problem of reducing environmental load by means of storage of waste of this type is extraction of valuable components (such as fluorine), that can be used further for preparation of fluorine entities (cryolite, calcium fluoride), that are brought back to electrolytic process. We have held experiments on extracting fluorine from SPL by caustic liquor leaching under effect of ultrasonic oscillations on a pulp, increasing the degree of fluorine solubilization. By means of mathematical planning method of a factor experiment cross impact of three leaching parameters was stated, maximum concentration of fluorine ions in the solution (20.21 gr/dm3) was achieved in following conditions: NaOH concentration - 2%, solid-liquid ration - 6:1, process length - 90 min. The degree of fluorine extraction from SPL is 69.87%.

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Analytical Methods of Researching the Aluminium Electrolysis cell Fulfilled Lining Samples

Cited by 6 publications

References 2 publications

Ways of Solving the Ecological Problem of Alluminium Smelting Hard Waste Disposa

Ways of Solving the Ecological Problem of Alluminium Smelting Hard Waste Disposa

Hydrometallurgical Processing of Spent Carbon Lining to Extract Valuable Components for Cryolite Production

Study of Influence of Parameters of Leaching Fluorine from Spent Pot Lining

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