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How to make ferric chloride solution from its powder to apply in clarifier

(-----) 2006

In my company (pulp & paper production), we got problem with our clarifier (first step).
All solid in wastewater settled in clarifier.
physical condition (temperature 60 oC, solid inlet 700-900 ppm)

we would like to apply ferric chloride to help setlling of solids in clarifier.
I don't now how to make solution ferric chloride.
if FeCl3 + H2O ---= Fe(OH)3 sediment

so, how to make solution without sediment formation and applicable in wastewater settling.

Zulfikar Azmi
pulp & paper - Pelalawan, Riau, Indonesia
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2006

Dissolve the ferric chloride in acidic solution, e.g., dilute sulfuric acid.
You will get better dispersion by adding to the wastewater in an acidic stage (if present in your treatment). At higher pH, rapid stirring is necessary.

Acidic ferric chloride solutions are extremely corrosive, so plastic piping may be necessary.

Ken Vlach [dec]
- Goleta, California
Finishing.com honored Ken for his countless carefully researched responses. He passed away May 14, 2015.
Rest in peace, Ken. Thank you for your hard work which the finishing world, and we at finishing.com, continue to benefit from.
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