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    • 2. 发明授权
    • Method for solidifying radioactive waste
    • 固化放射性废物的方法
    • US5481061A
    • 1996-01-02
    • US141541
    • 1993-10-27
    • Kiyomi FunabashiKoichi ChinoOsamu KuriyamaTsutomu BabaShunsuke UchidaMakoto Kikuchi
    • Kiyomi FunabashiKoichi ChinoOsamu KuriyamaTsutomu BabaShunsuke UchidaMakoto Kikuchi
    • C04B28/02G21F9/16G21F9/30G21F9/00
    • C04B28/02G21F9/16G21F9/165G21F9/304
    • The present invention relates to a method of solidifying radioactive waste with cement, comprising forming a mixture comprising water, a hydrophilic material and cement substantially non-shrinkable or expansible with respect to volume change upon hardening, mixing said mixture with the radioactive waste, followed by hardening to form a solid body.The present invention enables the formation of a compact solid body having voids, such as capillary voids, of reduced volume, which makes it possible to reduce the leaching rate of hazardous materials. Further, since no shrinkage accompanies hardening, no tensile stress occurs in the cement surrounding minute waste particles within the hardened material, thereby enabling a decrease in the strength of the solid body to be minimized. This in turn enables an increase in the amount of packing of waste. Prior addition of a hydrophilic material enables the cement fluidity before hardening to be maintained even after complete absorption of water by a water absorptive waste. This is extremely advantageous in carrying out hardening.
    • 本发明涉及一种用水泥固化放射性废物的方法,包括形成水,亲水材料和水泥在混合物硬化后基本上不可收缩或可膨胀的混合物,将所述混合物与放射性废物混合,然后 硬化形成固体。 本发明能够形成具有减小体积的诸如毛细管空隙的空隙的紧凑的固体,这使得可以降低有害材料的浸出率。 此外,由于没有收缩伴随硬化,所以在硬化材料内的微小废弃颗粒周围的水泥中不产生拉伸应力,从而能够使固体的强度降低到最小。 这又可以增加废物的包装量。 亲水性材料的先前添加使得即使在通过吸水性废物完全吸收水之后,硬化前的水泥流动性仍能保持。 这在进行硬化方面是非常有利的。
    • 9. 发明授权
    • Waste water concentrator and waste water disposal plant
    • 废水集中器和废水处理厂
    • US5028298A
    • 1991-07-02
    • US273513
    • 1988-11-04
    • Tsutomu BabaKoichi ChinoShunsuke UchidaToshio SawaMakoto Kikuchi
    • Tsutomu BabaKoichi ChinoShunsuke UchidaToshio SawaMakoto Kikuchi
    • G21F9/08B01D1/30B01D19/00B01D46/00C02F1/04G21F9/00
    • B01D1/305B01D19/0031C02F1/048Y10S159/12Y10S159/27Y10S159/28Y10S203/16
    • The present invention relates to a technique of concentrating waste water whereby the water content of the waste water is removed with a high decontamination factor, employs a porous membrane having a property allowing gas such as steam to permeate but not allowing a liquid such as water to do, as a membrane for concentrating the waste water, and adopts a method wherein the waste water is turned into a vapor flow and this vapor flow is made to contact the porous membrane so as for the waste water to be concentrated on the occasion when the waste water is to be concentrated by means of this porous membrane. By turning the waste water into the vapor flow, most of various metal ions, a surfactant, etc. existing in the waste water are separated from the vapor flow. Mist, metal ions in the mist and others contained in the vapor flow are removed by the aforesaid porous membrane from the steam while permeating the same. This enables the disposal of the waste water with a high decontamination factor, for a long duration and in a stable manner. When this technique of concentrating waste water is adapted to a plant for disposal of waste water of high electroconductivity produced from a nuclear power station, for instance, various tanks, a demineralizer, ion-exchange resin, etc. provided on the downstream of a concentrator are dispensed with, and thus the plant for disposal can be simplified to a large extent.
    • PCT No.PCT / JP88 / 00245 Sec。 371日期:1988年11月4日 102(e)日期1988年11月4日PCT PCT。 出版物WO88 / 06914 日本公开日1988年9月22日。本发明涉及一种浓缩废水的技术,其中废水的含水量以高净化因子除去,采用具有允许诸如蒸汽的气体渗透但不允许的性质的多孔膜 允许诸如水的液体作为用于浓缩废水的膜,并且采用其中废水变成蒸汽流的方法,并使该蒸汽流与多孔膜接触,以使废水达到 集中在废水通过该多孔膜浓缩的场合。 通过将废水转化为蒸汽流,存在于废水中的大多数各种金属离子,表面活性剂等与蒸汽流分离。 雾中的金属离子和包含在蒸气流中的其它物质被透过前述多孔膜从蒸汽中除去。 这样可以长时间和稳定地处理具有高去污因子的废水。 当这种将废水浓缩的技术适用于处理从核电站产生的高导电性废水的设备,例如设置在浓缩器下游的各种罐,脱盐装置,离子交换树脂等 可以在很大程度上简化处理设备。