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Process Water Installation

ReFe - Iron (Fe) removal from rinse water in pickling lines
It is generally accepted that the presence of Fe has a negative influence on both zinc consumption and the quality of the galvanized steel and therefore should be avoided. WTN Water Treatment developed the ReFe-system to overcome this problem.

WTN Water Treatment has developed a continuous Fe removal process for flux/rinse bath solutions, which completely eliminates the production of waste. The Fe is recovered as an Fe-containing HCl solution which can be used to modify the composition of pickling baths.

Process description

The unit consists of three different sections:
  • neutralisation section
  • ion-exchange section
  • stripping section
All ion-exchange processes are highly sensitive to solid particles, which inter- fere with the process as a whole. After filtration with a standard plate-filter the feed solution with controlled pH is pumped through the ion-exchange col- umn where the Fe is absorbed by the resin.

After leaving the column, the liquid is returned to the rinse/flux bath. When the resin is saturated with Fe, it must be stripped and regenerated.

The stripping/regeneration solution is pumped from a storage vessel through the column into another vessel. An ex- change of Fe and HCl takes place in the column. Fe is dissolved in the HCl, while the HCl is absorbed by the resin. It is not necessary to rinse the column as pollution is no problem here.

Additionally

Next to Fe removal savings can be made by control of composition and performance of the flux.

To make it easy for you WTN offers its customers additionally:
  • Laboratory support and advice
  • GALVA FLUX - Fluxing salt
  • Trade in zinc ashes and dross




Results obtained in a Dutch plant:
  • Decrease in zinc-pickup > 25%
  • Efficiency of Ni from 25 to >80%
  • Increase production rate >10%
  • Decrease in zinc ash production
  • Decrease in dross production
  • Dross removal before treatment: 8t/2 wk; at present: 2t/6 wk
  • Decrease in fumes
  • Higher product quality
  • No rinse water








 

WTN International Group

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Contact

  • Wilfred Sprang
  • (M) +31 6 53 35 62 48
  • (Skype Address) wtnwilfred

  • Tineke Zwaan
  • (M) +31 6 20 14 27 92
  • (Skype Address) tinekez

  • (F) none, scan to info@wtn.nl
  • (E) info@wtn.nl

Address

  • Office
  • Herenweg 9
  • 3602 AM Maarssen
  • The Netherlands
  • Postal Address
  • Piet Heinstraat 108
  • 3601 TB Maarssen
  • The Netherlands

Company Information

  • Chamber of Commerce
  • Utrecht, no: 605 49 890
  • Vat No:
  • NL 8539 57 459.B01