Special technique at krb a
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Special technique at KRB A:. Decontamination of stainless steel parts with phosphoric acid. Electropolishing. quick processing time reliability less secondary waste maximal recycling effect. Principle of electropolishing. +. 6000 A at low voltage. bath with phosphoric acid. -.

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Special technique at krb a

Special technique at KRB A:

Decontamination of

stainless steel parts with

phosphoric acid

Electropolishing

  • quick processing time

  • reliability

  • less secondary waste

  • maximal recycling effect


Principle of electropolishing

Principle of electropolishing

+

6000 A

at low voltage

bath with phosphoric acid

-

before

after

Oxide skin

H2PO4

chemical or

electrochemical

Base material


Stainless steel in acid bath

Stainless Steel in Acid Bath


Stainless steel after electropolishing

Stainless Steel after Electropolishing


Regeneration of phosphoric acid

Regeneration of Phosphoric Acid

  • Recycling of Phosphoric acid by

  • Reuse acid for decontamination

  • Thermolysis of iron oxalat

- adding oxalic acid

- precipitate the dissolved iron as

- iron oxalate

- extracting the iron oxalate

- vaporization

- heating the iron oxalate

- transformation into iron oxid for final storage


Schematic principle of regeneration

Schematic principle of Regeneration


Thermolysis plant for iron oxalate

Thermolysis plant for iron oxalate


Technical data of the thermolysis

Technical Data of the thermolysis


Example secondary steam generator

Example „Secondary Steam Generator“

Vessels of three Steam Generators

decontaminated from 20,000 Bq/cm²

to free release

producing only 1,5% radioactive waste


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