| About this Abstract |
| Meeting |
2010 TMS Annual Meeting & Exhibition
|
| Symposium
|
Alumina and Bauxite
|
| Presentation Title |
Redundancy of Security Filtration |
| Author(s) |
Peter-Hans ter Weer |
| On-Site Speaker (Planned) |
Peter-Hans ter Weer |
| Abstract Scope |
Security Filtration in the Bayer alumina refinery aims at controlling the contamination of alumina product by lowering the solids concentration in the decanter / settler overflow to the desired level in the Liquor to Precipitation (LTP).
Significant strides have been made in the design of high rate thickeners and their feedwells, and similarly in the preparation of modern synthetic flocculants. Recent technological developments enable achieving solids levels in the bauxite residue settler overflow which are low enough to meet the targeted solids in LTP. This applies to existing refineries as well as to brownfield and greenfield projects.
These developments provide an opportunity to lower alumina refinery operating and capital costs by (partly) by-passing or excluding the Security Filtration area. Savings include opex savings up to .8-1.5 $/tA and, in case of brownfield and greenfield projects, capex savings of 15-25 $/Annual tA. |
| Proceedings Inclusion? |
Definite: A combination print-CD volume |