METHOD OF RECOVERING INORGANIC MATTER PARTS MATERIAL FROM ELECTRONIC PARTS USING SUPERCRITICAL WATER

摘要

PROBLEM TO BE SOLVED: To remove resin components of electronic parts composed of inorganic matter and the resin components by combining the oxidation decomposition by supercritical water and a swelling agent and to recover the inorganic matter in the state of an original form without entailing the change of the composition and the degradation in strength and function. SOLUTION: The electronic parts and the ultrapure water are put into a reaction tube 20 of a reaction apparatus 2 and both ends of the reaction tube are suspended by wires 21 and the reaction tube is immersed into a sand bath 22. The temperature and pressure in the reaction apparatus are controlled by a control panel 23 and the swelling by the addition of the swelling agent and the oxidation decomposition by the supercritical water are effected, by which the resin components are removed. The inorganic matter is recovered in a non-oxidizing state. The oxidation decomposition of the resin components by the supercritical water is preferably effected by setting the specific dielectric constantεw of the supercritical water at 4<=εw<=7 and ion product Kw at 14<=-LogKw<=17 and can be effected by adding an oxidizing agent thereto.