Abstract: The present zinc recovery method is characterized in including a dissolving process of treating a raw material containing zinc with an alkaline fluid at a temperature equal to or higher than 100° C. to dissolve zinc contained in the raw material, and a recovering process of recovering zinc extracted from the raw material by the dissolving process.

Abstract: Disclosed is an improved process for cement solidification treatment for disposition of spent ion exchange resins exhausted from nuclear power plants.The wet resin particles are centrifuged to remove free water therefrom and subjected to the pre-treatment of coating with a small amount of cement powder, and then, cement powder and water is added to the resin particles and the mixture is kneaded to form cement paste, which is cast in to a vessel for solidification.The cast product contains much more resin particles and has improved water-resistability.

Abstract: A process for compacting and solidifying solid waste materials to effect the volume reduction thereof simultaneously with the solidification thereof with thermoplastic resins originally contained in the waste materials and, if necessary, supplementary thermoplastic resins externally supplied thereto, thus facilitating the waste materials for temporary storage or final disposal thereof; an appartus for carrying out said process; and an overall system for disposal of the waste materials.

Abstract: An apparatus for compacting a solid waste material includes a hollow cylindrical body having a charging inlet for charging the solid waste material therethrough into the hollow cylindrical body, a heating portion for heating the solid waste material in the hollow cylindrical body, and a discharging outlet for discharging the solid waste material from the hollow cylindrical body; a rotatable shaft disposed in the hollow cylindrical body and having a helical screw blade thereon, the screw blade and an inner wall surface of the hollow cylindrical body being spaced from each other with a clearance provided therebetween for allowing the solid waste material in the hollow cylindrical body to form a bridge therein; a support for radially movably supporting an end of the rotatable shaft; a prime mover coupled to the end of the rotatable shaft through the support; and an outlet nozzle coupled to the discharging outlet for compressing the solid waste material discharged from the discharging outlet.