<報文>L型ゼオライトの加熱変化およびセシウムとストロンチウムのイオン交換特性

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Thermal change and ion exchange properties of Cs and Sr have been studied for zeolite L. The zeolite structure is stable below 900℃ and converts to the amorphous phase above 1000℃. The cesium form of zeolite L recrystallized to pollucite (CsAlSi_2O_6) by calcination at 1400℃ for 1h or under hydrothermal condition (300℃, 290atm, 24h). Hydrogen-form zeolites were prepared by the acid treatment in 10^<-2>〜10^<-1>M HNO_3 solutions or thermal decomposition of NH_4 form zeolites at 460〜500℃. The distribution of Cs and Sr was dependent on equilibrium pH and the distribution coefficient (K_d) was about 10^4 (ml/g) at pH5〜7. The exchange capacity of Cs and Sr was 0.89 (meq./g zeolite) and exchanging ratio was 68% at D sites in main channel. These cations in zeolite were completely eluted with 10^<-1>M HNO_3 solution.thermal changeion exchange propertycesiumstrontiumzeolite Lpollucitedistribution coefficient
1987-03-10