Polyelectrolyte for the steel industry
Steel plants recirculate large volumes of water through rolling mills, gas cleaning and cooling. Fine scale and iron-bearing solids have to settle quickly for that water to be reused.
Sunfloc Anionic HQ for regular plant use, or Anionic MQ for smaller plants and trials. Confirm on your own sample with a free jar test.
Which charge
Anionic polyacrylamide is the usual choice for steel industry wastewater. Start with Anionic HQ or Anionic MQ.
Scale pits and clarifiers
Add the polymer where the water is gently mixed ahead of the clarifier or settling pit, so fine scale and iron solids settle together.
Recirculating water
Clear overflow means cleaner nozzles and less wear in the recirculation system.
Sludge
Mineral sludge from steel plants generally suits anionic grades for thickening and dewatering. Confirm on your own sludge.
Related
Polyelectrolyte dosing guide
Starting doses, solution strength and how to work out kilograms per day.
Read →Where this work clusters
A steel-works water audit
A steel plant has several separate water streams, and each wants its own dose. Scale pits catch heavy mill scale and need very little polymer. Rolling-mill and cooling circuits recirculate water that carries fine iron oxide, and a small anionic dose in the clarifier keeps the return clear. Slag and sludge streams are thickened before filtration.
Start by listing each stream, the flow in cubic metres a day, and the target overflow. Then jar-test each one separately, since the dose that works for the thickener will be too much for the scale pit.
Discharge is judged against the limits your state board sets under the Environment (Protection) Rules; the general standard lists pH 5.5–9.0 for discharge to inland waters. Check the limit that applies to you before you set a target.
Sources: Schedule VI general standards for effluent discharge (state pollution control board copy); ASTM D2035-19, Coagulation-Flocculation Jar Test of Water.
Not sure which grade suits your water?
Send us a one-litre sample or describe your process. We test it in our lab free of charge and recommend a grade and starting dose, and quote within 1 business hour.