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Adsorbents on zeolite base, their preparation and their use for the treatment of radioactive sewage water

机译:沸石基吸附剂,其制备方法及其在放射性污水处理中的用途

摘要

Zeolite is contacted with an aqueous solution containing at least one of copper, nickel, cobalt, manganese and zinc salts, preferably copper and nickel salts, particularly preferably copper salt, in such a form as sulfate, nitrate, or chloride, thereby adsorbing the metal on the zeolite in its pores by ion exchange, then the zeolite is treated with a water- soluble ferrocyanide compound, for example, potassium ferrocyanide, thereby forming metal ferrocyanide on the zeolite in its pores. Then, the zeolite is subjected to ageing treatment, thereby producing a zeolite adsorbent impregnated with metal ferrocyanide in the pores of zeolite. The adsorbent can selectively recover cesium with a high percent cesium removal from a radioactive liquid waste containing at least radioactive cesium, for example, a radioactive liquid waste containing cesium and such coexisting ions as sodium, magnesium, calcium and carbonate ions at the same time at a high concentration. The zeolite adsorbent has a stable adsorbability for a prolonged time.
机译:使沸石与含有铜,镍,钴,锰和锌盐中的至少一种,优选为铜和镍盐,特别优选为铜盐,以硫酸盐,硝酸盐或氯化物的形式的水溶液接触,从而吸附金属通过离子交换在沸石的孔中对沸石进行处理,然后用水溶性亚铁氰化物例如亚铁氰化钾处理沸石,从而在其孔中在沸石上形成金属亚铁。然后,对该沸石进行时效处理,从而在沸石的细孔中制造浸渗有金属亚铁氰化物的沸石吸附剂。吸附剂可以选择性地从至少含有放射性铯的放射性废液中回收铯,并且铯的去除率很高,例如,同时含有铯和诸如钠,镁,钙和碳酸盐离子的共存离子的放射性废液。高浓度。沸石吸附剂具有长时间稳定的吸附性。

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