日本ゼオライト学会　刊行物 Publication of Japan Zeolite Association

The accurate measuring method for CEC which is important to evaluate the quality of natural zeolites on the use of them was proposed and examined about some conditions for the method. As the result, it was found that the CEC of clinoptilolite measured by usual method was not correct. Then the purification of natural zeolites was examined by removing impurities which prevent natural zeolites from the use of industry, and in case of clinoptilolite from Shimane prefecture the production of purity 92% zeolite was succeeded. The primary factor was considered that the particle separation was accelerated by expanding action of montomolilonite included as an impurity. Next, introducing the interesting eight use research examples presented in the 5th Conference of Natural Zeolites held in Italy last year, the future direction of use researches for natural zeolites was discussed. One was to give a reconsideration to the use for resources of industry and construction materials, there were few use researches about pozzolan activities of natural zaolites in Japan. Another was the advanced development into the use researches for the water treatment, the waste stabilization and the environmental improvement applying the large cation exchange capacity of natural zeolites.