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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. +. 6000 A at low voltage. bath with phosphoric acid. -.

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Special technique at KRB A:

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  1. Special technique at KRB A: Decontamination of stainless steel parts with phosphoric acid Electropolishing • quick processing time • reliability • less secondary waste • maximal recycling effect

  2. Principle of electropolishing + 6000 A at low voltage bath with phosphoric acid - before after Oxide skin H2PO4 chemical or electrochemical Base material

  3. Stainless Steel in Acid Bath

  4. Stainless Steel after Electropolishing

  5. 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

  6. Schematic principle of Regeneration

  7. Thermolysis plant for iron oxalate

  8. Technical Data of the thermolysis

  9. 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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