보문 : 국산 천연 Zeolite 광물에 (鑛物) 의한 폐수중의 중금속 제거에 관한 연구

The mineralogical properties of domestic natural zeolites were investigated by the chemical composition analysis, X-ray diffraction analysis, thermal analysis and cation exchange capacity measurment. Experimental studies have been conducted on the removal of heavy metal ions from waste water by using natural zeolite which has large adsorptvity and ion exchange capactiy. The results obtained are summerized as follows. 1) These natural zeolites were mainly mordenite and clinoptilolite which have cation exchange capacity of 83-186meq/100g. 2) The zeolite contents had no relation with the molar ratio of SiO₂/Al₂O₃but had a strong positive corelation with Na₂O and K₂O contents. The alkali contents showed a important relationship for the adsorptivity of metal ions. 3) Adsorptive capacity of heavy metal ions incresed in order of Pb>Cd≥Cu>Zn≥Ni in spite of the kinds of zeolite tuffs such as mordenite and clinoptilolite. This tendency corresponds to the order of hydroionic radius.