Separation and Refining of Heat-Generating Nuclides in High-Level Liquid Wasters by Zeolites

采用沸石柱对高放废液中Cs、Sr的分离回收进行了研究。研究结果如下：1. Cs、Sr的洗脱行为研究了Cs、Sr在沸石上的洗脱行为。Cs和Sr的保留体积（V_R）与分配系数（K_d）之间的线性关系为V_R=V_m+pV_aK_d（V_m：间隙体积，p：密度，V_a：负载体积）.用镁碱沸石柱选择性吸附高放废液中的铯、锶离子，用NH_4^+盐溶液洗脱。流出液中的Sr^<2+>离子吸附在A型沸石柱上，EDTA洗脱，A：F=2：3的混合沸石对Cs和Sr的色谱分离效果较好，R_s值为1.41.通过煅烧和沉淀两种方法，分别以CsCl和SrF_2的形式回收了Cs和SrCs，并将其回收到高放废液中，为Cs和Sr在高放废液分配过程中的利用和转化提供了依据。

Separation and Recovery of Cs and Sr in high-level liquid wastes (HLLW) were studied by using columns of zeolites. Research results were as follows.1. Elution Behavior of Cs and SrElution behavior of Cs and Sr loaded on zeolites was examined by using various eluents, acids, inorganic salts solution, chlating reagents. A linear relationship between retention volume (V_R) and distribution coefficients (K_d) of Cs and Sr was found to be V_R=V_m+pV_aK_d (V_m : interstitial volume, p : density, V_a : loaded volume).2. Mutual Separation of Cs and SrCesium ions in denitrated HLLW were selectively adsorbed on ferrierite column and eluted by passing the eluent of NH_4^+ salt solution. The Sr^<2+> ions in effluent were then adsorbed on the column of zeolite A and elutedby EDTA.Mixed zeolites of A : F=2 : 3 were effective for the chromatographic separation of Cs and Sr and high R_s value of 1.41 was obtained.3. Recovery of Cs and SrCs and Sr in eluted fractions were recovered as CsCl and SrF_2 by calcination and precipitation, respectively.These results are expected for the utilization of Cs and Sr and their transmutation in the partitioning process of HLLW.