Last updated on 09 Oct 2018 06:49 (cf. Authors)
Short description
The category 2.C.3 - Aluminium production is sub-divided into primary aluminium and secondary aluminium.
In Germany, primary aluminium is produced in electrolytic furnaces with pre-baked anodes. The pre-baked anodes are produced in separate anode production plants, where petroleum coke and tar pitch are mixed subsequently baked. This process produces PAH emissions. Hence, the aluminium production is a trend key category for PAH (TIER-2-method, TIER-3-method).
Secondary aluminium is produced in several different furnace types. According to different scrap qualities, the emissions in secondary aluminium industries are varying.
Methodological issues
Activity data
The production figures for the year 2016 were taken from the annual statistical report of the German association for non-ferrous metals [1].
The total quantity of waste gas incurred per tonne of aluminium during the production of primary aluminium was multiplied by an average concentration value formed from several individual figures, from various different plants, with appropriate weighting.
Emission factors
The emission factors also make allowance for fugitive emission sources, such as emissions via hall roofs.
The emission figures used for CO are the results of emission measurements within the context of investment projects.
The emission factors for SO2 are calculated from the specific anode consumption. The anodes consist of petrol coke; this material has a specific sulphur concentrations of about 1.2 %, from which an SO2 emission factor of 10.4 kg/t Al can be calculated.
The average anode consumption is 430 kg of petrol coke per tonne of aluminium.
The following table shows some process-related emission factors.
Table 1: Emission factors appliedpollutant | Activity / Process | EF | unit | Trend |
---|---|---|---|---|
PAH | anode production | 300 | mg/t | constant |
CO | primary aluminium | 180 | kg/t | constant |
SO2 | primary aluminium | 7.341 | kg/t | constant |
TSP | primary aluminium | 0.83 | kg/t | falling |
PM10 | primary aluminium | 0.7055 | kg/t | falling |
PM2.5 | primary aluminium | 0.581 | kg/t | falling |
TSP | resmelted aluminium | 0.055 | kg/t | constant |
PM10 | resmelted aluminium | 0.047 | kg/t | constant |
PM2.5 | resmelted aluminium | 0.03843 | kg/t | constant |
Recalculations
With activity data and emission factors remaining unrevised, no recalculations have been carried out compared to last year's submission.
Planned improvements
At the moment, no category-specific improvements are planned.