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ArticleName Impact of alumina partial density on the process conditions of aluminium reduction from cryolite-alumina slurry parameters
DOI 10.17580/tsm.2016.12.05
ArticleAuthor Yasinskiy A. S., Vlasov A. A., Polyakov P. V., Solopov I. V.

Siberian Federal University, Krasnoyarsk, Russia:

A. S. Yasinskiy, Post-Graduate Student, e-mail:
A. A. Vlasov, Assistant Professor of a Chair of Engineering Bachelor's Program CDIO
P. V. Polyakov, Professor-Consultant of a Chair of Metallurgy of Non-Ferrous Metals
I. V. Solopov, Post-Graduate Student


The laboratory experiments of aluminium reduction in high temperature alumina slurry with inert anodes and low melting electrolyte are presented. There is found the information about the impact of alumina partial density in slurry (solids content) on electrical conductivity, voltage, hydrodynamic resistance and bubbles shape and volume during electrolysis. When alumina partial density (and hydrodynamic resistance) increases, convective mass transfer is expected to become difficult, back reaction rate decreases on the one hand, and electrical conductivity increases due to nonconductive phase (bubbles and alumina particles) volume increasing on the other. Laboratory experiments show the problems in high-temperature slurry electrolysis technology: difficult oxygen evacuation from anode space, uneven alumina partial density distribution in areas of sedimentation and fluid flows. High bubbles volume and electrical resistance around 0.125 ohm·m at ia = 3 kA/m2 appears at alumina partial density of 0.81·103 kg/m3, which corresponds to 25% vol. of alumina in slurry. The ways of resistance decreasing and the technological parameters of high-temperature slurry electrolysis improving are developed. Studying of slurries is important in order to understand their impact on spikes formation.
The paper was written using the results, taken during the project 02.G25.31.0181 “Development of high performance energy saving aluminium reduction technology RA-550” implementation as a part of complex projects realization program of high efficiency production development, approved by Russian Federation government regulation No. 218 from April the 9th, 2010.

keywords Slurry electrolysis, aluminium production, low-temperature electrolysis, inert anodes, anode space, bubbles, alumina, non-Newtonian fluids

1. Buckingham D. A., Plunkert P. A., Bray E. L. Aluminium statistics. U.S. Geological survey. Available at :
2. Tkacheva O. Yu. Nizkotemperaturnyy elektroliz glinozema vo ftoridnykh rasplavakh : dissertatsiya … doktora khimicheskikh nauk : 05.17.03 (Lowtemperature electrolysis of alumina in fluoride melts : Dissertation … of Doctor of Chemical Sciences : 05.17.03). Ekaterinburg, 2013. 245 p.
3. Beck T. R. Production of aluminum with low temperature fluoride melts Essential Readings in Light metals. 2013. Vol. 2. pp. 89–95.
4. Fang Zhao. The resistibility of semi-graphitic cathode to alkali metal (K and Na) penetration. Light metals. 2015. pp. 843–848.
5. Efhtymios Balomenos et al. Investigations into Innovative and Sustainable Processes for the Carbothermic Production of Gaseous Aluminum. Light metals. 2014. pp. 771–776.
6. Galasiu I., Galasiu R., Thonstad J. Inert Anodes for Aluminium Electrolysis 1st edition. Düsseldorf, Germany : Aluminium-Verlag, 2007. 207 p.
7. Grandfield J., Pawlek R. P. Inert anodes: an update. Light metals. 2014. pp. 1309–1313.
8. Shengzhong Bao, Guisheng Liang, Jianhong Yang, Junwei Wang, Zhiming Liu. Aluminum electrolysis tests with inert anodes in KF – AlF3-based electrolytes. Light metals. 2006. pp. 321–326.
9. Polyakov P. V., Popov Yu. N., Yasinskiy A. S. Elektrolizer dlya polucheniya zhidkikh metallov elektrolizom rasplavov (Electrolyser for obtaining of liquid metals by melt electrolysis). Patent RF, No. 2586183, IPC C 25 C 3/06 — 22.01.2015. Applier and Patent-Holder: Siberian Federal University, No. 2015101950/02. Published : 10.06.2016. Bulletin No. 16
10. Simakov D. A. Razrabotka osnov tekhnologii polucheniya alyuminiya elektrolizom suspenziy glinozema vo ftoridnykh rasplavakh s tselyu uluchsheniya tekhnicheskikh i ekologicheskikh pokazateley protsessa Eru – Kholla : dissertatsiya … kandidata tekhnicheskikh nauk (Development of the basis of aluminium obtaining technology by electrolysis of alumina suspensions in fluoride melts for the purpose of improvement of technical and ecological indicators of Hall – Héroult process : Dissertation … of Candidate of Engineering Sciences). Krasnoyarsk, 2006. 174 p.
11. Polyakov P. V., Klyuchantsev A. B.,Yasinskiy A. S., Popov Y. N. Conception of «Dream Cell» in aluminium electrolysis. Light metals. 2016. pp. 283–288.
12. Wilkinson W. L. Nenyutonovskie zhidkosti. Gidromekhanika, peremeshivanie i teploobmen (Non-newtonian fluids: Fluid Mechanics, Mixing and Heat Transfer). Translated from English by Z. P. Shulman. Ed.: A. V. Lykov. Moscow : Mir, 1964. 217 p.
13. Reiner M. Reologiya (Rheology). Translated from English by N. I. Malinin. Ed.: E. I. Grigolyuk. Moscow : Nauka, 1965. 223 p.
14. Chhabra R. P. Bubbles, drops and particles in non-Newtonian fluids. Second edition. Boca Raton, London, New York : Taylor & Francis Group, 2007. 72 p.
15. Sides P. J. Phenomena and effects of electrolytic gas evolution. Modern Aspects of Electrochemistry. 1986. Vol. 18. pp. 303–355.
16. Vogt H. Gas-evolving electrode. Comprehensive treatise of electrochemistry. 1983. Vol. 6 : Plenum press. N. Y. and London. pp. 445–489.
17. Williams E., Bugnion L., Fischer J.-C. Effect of carbon dust on the electrical resistivity of cryolite bath. Light metals. 2016. pp. 587–591.
18. GOST 30558–98. Glinozem metallurgicheckiy. Tekhnicheskie usloviya (State Standard 30558–98). Alumina, metallurgical. Specifications.
19. John S. Newman. Elektrokhimicheskie sistemy (Electro-Chemical Systems). Moscow : Mir, 1977. 463 p.

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