Aluminium is produced in reduction cells, which are tanks the size of small swimming pools.
Electricity is passed through the cells and electrolysis, an electrochemical process that separates aluminium oxide into aluminium atoms and oxygen atoms, takes place. The process requires intense heat.
The technology challenge is to increase the productivity of the cell, minimimise energy consumed per tonne of aluminium produced, and minimise capital and operational costs.
EGA’s technology development since 1990 has more than doubled the size of cell that is technically and commercially viable. At the same time, it has reduced the amount of electricity required to produce each tonne of aluminium by 37.5 per cent improving both cost and environmental performance.
EGA’s latest technology, DX+ Ultra has more than double the productivity of our first D18 technology developed in 1990 from the original technology used to build our Jebel Ali smelter.
The first generation of our DX Technology was developed in 2006 at EGA in Jebel Ali.
We installed DX Technology in a dedicated industrial 40-cell potline in 2008. The cells began operating at 340 kA and now exceed 420 kA.
DX Technology is also used in the 756 cells of the first phase of our smelter at Al Taweelah (Potlines 1 and 2), which now operate at near 420 kA.
DX+ Technology is based directly on the proven, inherently robust DX technology.
It offers similar advantages in terms of current efficiency, energy consumption and environmental performance, with the added advantage of higher productivity at a lower capital cost per installed tonne of capacity.
Five DX+ cells built in the Eagle pilot line at Jebel Ali began operating at 420 kA in 2010. The amperage was increased in successive increments to 450 kA by the end of 2013.
We used DX+ Technology in the second phase of our smelter Al Taweelah, Potline 3, which has 444 cells. These cells began operating stably at 440 kA, and have since reached 465 kA.
Further work to develop even lower energy high amperage reduction cells led to the design of DX+ Ultra Technology.
By introducing various voltage drop initiatives that address the key energy consumers in a reduction cell, DX+ Ultra Technology achieves substantially reduced specific energy consumption than earlier generation cells.
DX+ Ultra cells operate at above 440 kA. In 2014 we built and commissioned five DX+ Ultra Technology demonstration cells at the Eagle pilot line, replacing the five DX+ Technology cells. These cells now operate at 465kA.