Nordic Steel Mill solution reduces water treatment costs
Sep 05, 2008
Transporting mill scale with water to create a continuous recycling loop reduces costs by eliminating much manual handling and allowing continuous operation in less space than traditional solutions. Mills in Northern Europe like Outokumpu’s plant in Avesta, Sweden have been turning to Nordic Water for solutions based on screw dewaterers, lamella separators and Dynasand filters.
High chromium alloyed steel is used in the pump house and impeller. Despite the harshness of the slurry, the wear parts last more than a year even on hard roughing duties. On finer scale the wear parts may last over ten years.
- Rigid shaft and bearings to withstand the shock of the heaviest objects
- Flow variation insensitive
- Air blockage insensitive
- Ability to run dry
- Ability to release sump deposits with a bottom impeller or return spray-holes.
The dewatered scale is a drip dry material with less than 2-8% moisture depending on particle size distribution.
A cross current lamella pack mounted in the dewaterer increases the pool area to give a total settling area (or pit equivalent) of 100 m2 allowing for a feed flow of close to 2000 m3/h (8800) gpm in one unit. Seven units of this size operates at Voest Alpine, Linz, Austria.
The filtered water contains less than 5-10ppm of residual solids and oil, satisfying most demands for recycling or bleed. For polishing purposes the filter may be operated with the support of coagulants, with a lower feed load or with activated carbon as filter bed, which will produce filtrates of just about any desired purity.
1) Mill-scale slurry is pumped to the screw dewaterer (2). Sump – pumps transport process water to sand filters (4). Water from the sand filters is pumped (5) back to the process via cooling towers. Wash from the continuous washing of the sand enters the thickener.
Oil is (7) is skimmed off as a residue, normally sent for burning.
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