Decontamination of Soil Washing Machines in High Level Radioactive Contaminated Soil Processing by Ceramic Thin Coating with Ion Plating Technique

Ishiyama Shintaro, Kamitani Masatake, Kondo Mitsunori, Hiki Akinori

doi:10.1252/kakoronbunshu.39.405

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イオンコーティング技術による高放射線汚染土洗浄用装置の汚染防止効果
イオンコーティングギジュツニヨルコウホウシャセンオセンドセンジョウヨウソウチノオセンボウシコウカ

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Abstract

Chemical interface controlled dispersion and high-speed shearing water washing tests were carried out with highly radioactive contaminated soil of over 570,000 Bq/kg in Fukushima. In present experiment, ion plating Al₂O₃ ceramic coating was applied to SUS304 substrate material for prevention of radioactive contamination, and its erosion and decontamination performance were assessed. The following results were obtained. (1) Adhesion of fission product (FP) contained in refined soil particles was observed on the surface of SUS304 test coupons coated with 5 µm of Al₂O₃. In wipe-out tests, contaminated soil particles were easily removed from the surface of Al₂O₃ coated test coupon, whereas contaminated soil particles were tightly bound to the surface of uncoated SUS coupons. (2) The erosion rate of uncoated SUS coupons was estimated as 0.94 µm/h within 1 h of soil washing operation, after which no erosion was observed. Very slow erosion of 0.14 µm/h was observed in the case of Al₂O₃ coated test coupons during the soil washing process.

Journal

KAGAKU KOGAKU RONBUNSHU

KAGAKU KOGAKU RONBUNSHU 39 (4), 405-410, 2013

The Society of Chemical Engineers, Japan

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