Process for treating gaseous emissions generated during production of carbon anodes in an aluminum plant
US6846472B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 16, 2002 |
| Grant date | Jan 25, 2005 |
| Priority date | — |
| Expiry date | Jul 26, 2023 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D53/685
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for treating gaseous emissions generated during the production of carbon anodes in the aluminum industry. In this process, first gaseous emissions generated during green anode preparation are collected and preheated by direct contact with a stream of combustion gases. Second gaseous emissions generated during anode baking are also collected and mixed with the first gaseous emissions to form a gaseous emission mixture. Alumina powder is then injected into the so obtained mixture and the resulting mixture with the alumina injected therein is processed into a dry scrubber that is equipped with a bag filter and is operating at temperatures well above the saturation temperature of tars, so as to obtain a gaseous mixture partially purified and free of fluorides and particulates. The so obtained partially purified gaseous mixture is then processed into an oxidation furnace in order to destroy all the organic compounds contained therein.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.