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Title:
TREATMENT PROCESS FOR WASTE FROM ALUMINIUM PRODUCTION CELLS
Document Type and Number:
WIPO Patent Application WO2002012594
Kind Code:
A3
Abstract:
The present claim refers to the obtainment of carbon and ceramic residues refined to a degree of purity that may render them fit for utilization in several other production process, as well to the recuperation of fluoride and oxides which re-utilization is economically desired. Last but not least important is the feature that extinguished the need for special warehousing of electrolytic cells wastes, as this process withdraws and eliminates all toxic wastes, which are presently classified as Class I Environmental Risk. The process is a clan process , based on the heating of the material to be refined at high temps, therefore destroying all cyanides contained in the original material. Heating may take place in any t type of atmosphere and impurities are drawn out by gravity and by release of gas and water steam, and are separated in the collectors, condensers and special filters. The gases in movement may be also the vapours and gases generated during the distillation or they could be released by the material added to the residue load, which could also generate steam or gases at process temps.

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Inventors:
DE OLIVEIRA DAVID GONCALVES (BR)
ROCIO LAMAS ALEX PAULO (BR)
VARELA JOSE ROBERTO (BR)
HABESH RUBENS (BR)
Application Number:
PCT/BR2001/000095
Publication Date:
August 15, 2002
Filing Date:
July 30, 2001
Export Citation:
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Assignee:
SERVIBRAS SERVICOS ESPECIAIS I (BR)
DE OLIVEIRA DAVID GONCALVES (BR)
ROCIO LAMAS ALEX PAULO (BR)
VARELA JOSE ROBERTO (BR)
HABESH RUBENS (BR)
International Classes:
A62D3/40; C04B33/132; (IPC1-7): B09B3/00; A62D3/00
Foreign References:
EP0465388A11992-01-08
US5746987A1998-05-05
GB2059403A1981-04-23
US5222448A1993-06-29
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