[2B10-14] Fukushima Daiichi NPT Accident Waste Treatment 7

[2B10] A Concept of Magnetic Separation Device for Volume Reduction of Radioactively Contaminated Soil

*Yasuyuki Itoh¹, Shigehiro Nishijima¹, Fumihito Mishima¹, Hiroshi Horiike¹ (1. Fukui University of Technology)

Keywords:radioactively contaminated soil, volume reduction, magnetic separation, superconducting magnet, ultrasonic waves

We will present a concept of a device used to magnetically separate radioactive cray (vermiculite) from a large amount of silt in Fukushima-prefecture for its volume reduction. Vermiculite particles included in the silt suspension are trapped on ferromagnetic wire mesh filters immersed in a high magnetic field up to 10 T and then stripped by ultrasonic waves propagating in collecting water filled in a processing tank. Using a superconducting solenoid magnet that has a room-temperature bore of 2 m in diameter and 5 m in height, we can expect to gain a processing capability of the silt with at least 40 m³/day.