Division BAT 9
United Kingdom
In order to prevent or, where this is not practicable, to reduce diffuse emissions from metal production, BAT is to optimise the efficiency of off-gas collection and treatment by using a combination of the techniques given below.
| Technique | Applicability | |
|---|---|---|
| a | Thermal or mechanical pretreatment of secondary raw material to minimise organic contamination of the furnace feed | Generally applicable |
| b | Use a closed furnace with a properly designed dedusting system or seal the furnace and other process units with an adequate vent system | The applicability may be restricted by safety constraints (e.g. type/design of the furnace, risk of explosion) |
| c | Use a secondary hood for furnace operations such as charging and tapping | The applicability may be restricted by safety constraints (e.g. type/design of the furnace, risk of explosion) |
| d | Dust or fume collection where dusty material transfers take place (e.g. furnace charging and tapping points, covered launders) | Generally applicable |
| e | Optimise the design and operation of hooding and ductwork to capture fumes arising from the feed port and from hot metal, matte or slag tapping and transfers in covered launders | For existing plants, the applicability may be limited by space and plant configuration restrictions |
| f | Furnace/reactor enclosures such as ‘house-in-house’ or ‘doghouse’ for tapping and charging operations | For existing plants, the applicability may be limited by space and plant configuration restrictions |
| g | Optimise the off-gas flow from the furnace through computerised fluid dynamics studies and tracers | Generally applicable |
| h | Charging systems for semi-closed furnaces to add raw materials in small amounts | Generally applicable |
| i | Treat the collected emissions in an adequate abatement system | Generally applicable |