To improve the recovery rates of classified solid wastes and to secure a large classification treatment capacity with an inexpensive device by blowing an ion wind on crushed solid waste falling from a hopper to electrify the solid waste, attracting the electrified solid waste by belts placed below an ion wind generator and as the result, classifying the crushed waste into attracted solid waste and non-attracted solid waste to recover them respectively.

In this device, at the time of classifying crushed solid waste obtained by crushing municipal solid waste, bulky solid waste, etc., into plastic or combustible solid waste, etc., and the other solid waste, an ion wind generator 14 for generating an ion wind is placed and crushed solid waste to be classified 11 is allowed to fall from a hopper 12 into a space into which the ion wind is blown out. The crushed solid waste 11 introduced into the ion wind is electrified by ions of the ion wind and concurrently, scattered in the directions toward belts 15A of conveyor devices 15. At this time, when the crushed solid waste 11 is electrically conductive crushed solid waste such as metals, the conductive solid waste is allowed to fall into the first separation vessel 18 without being attracted by the belts 15A to recover the conductive crushed solid waste in the vessel 18. On the other hand, when the crushed solid waste 11 is insulating crushed solid waste such as plastics, the insulating solid waste is attracted by the belts 15A and then, scraped down with scraper brushes 17 into the second separation vessel 19 to recover the insulating crushed solid waste in the vessel 19.