Removal of impurities from dry scrubbed fluoride enriched alumina

Schuh, L; Wedde, G

Title: Removal of impurities from dry scrubbed fluoride enriched alumina

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Abstract

The pot-gas from an aluminum electrolytic cell is cleaned by a dry scrubbing process using fresh alumina as a scrubbing agent. This alumina is enriched with fluorides and trace impurities in a closed loop system with the pots. The only significant removal of the impurities is due to metal tapping. An improved technique has been developed that is more effective than earlier stripper systems. The impurity-rich fine fraction (< 10 {micro}m) of the enriched alumina is partly attached to the coarser alumina. That attachment has to be broken. Selective impact milling under special moderate conditions and air classifying have shown to be a cost effective process for the removal of impurities. For iron (Fe) and phosphorus (P) about 30--70% can be removed by the separation of 0.5--1% of the alumina. Full scale tests have successfully confirmed these results.

Authors:

Schuh, L ^[1]; Wedde, G ^[2]

ABB Corporate Research Center, Heidelberg (Germany)
ABB Environmental, Oslo (Norway)

Publication Date:: Tue Oct 01 00:00:00 EDT 1996

OSTI Identifier:: 371982

Report Number(s):: CONF-960202-
ISBN 0-87339-312-0; TRN: IM9641%%59

Resource Type:: Book

Resource Relation:: Conference: Annual meeting and exhibition of the Minerals, Metals and Materials Society (TMS), Anaheim, CA (United States), 4-8 Feb 1996; Other Information: PBD: 1996; Related Information: Is Part Of Light metals 1996; Hale, W. [ed.] [Anglesey Aluminum Metal Ltd., North Wales (United Kingdom)]; PB: 1304 p.

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; ALUMINIUM; ELECTROLYSIS; IMPURITIES; OFF-GAS SYSTEMS; SCRUBBING; ALUMINIUM OXIDES; FLUORIDES; IRON; PHOSPHORUS; MILLING; CLASSIFICATION; SCANNING ELECTRON MICROSCOPY; X-RAY FLUORESCENCE ANALYSIS; EXPERIMENTAL DATA

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                    Schuh, L, and Wedde, G. Removal of impurities from dry scrubbed fluoride enriched alumina.  United States: N. p., 1996. 
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                    Schuh, L, & Wedde, G. Removal of impurities from dry scrubbed fluoride enriched alumina.  United States.

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                    Schuh, L, and Wedde, G. 1996.  
        "Removal of impurities from dry scrubbed fluoride enriched alumina".  United States.

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@article{osti_371982,

  title        = {Removal of impurities from dry scrubbed fluoride enriched alumina},

  author       = {Schuh, L and Wedde, G},

  abstractNote = {The pot-gas from an aluminum electrolytic cell is cleaned by a dry scrubbing process using fresh alumina as a scrubbing agent. This alumina is enriched with fluorides and trace impurities in a closed loop system with the pots. The only significant removal of the impurities is due to metal tapping. An improved technique has been developed that is more effective than earlier stripper systems. The impurity-rich fine fraction (< 10 {micro}m) of the enriched alumina is partly attached to the coarser alumina. That attachment has to be broken. Selective impact milling under special moderate conditions and air classifying have shown to be a cost effective process for the removal of impurities. For iron (Fe) and phosphorus (P) about 30--70% can be removed by the separation of 0.5--1% of the alumina. Full scale tests have successfully confirmed these results.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/371982},
  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {Tue Oct 01 00:00:00 EDT 1996},

  month        = {Tue Oct 01 00:00:00 EDT 1996}

}

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