| The progress on the bentonite has been systematically reviewed in this paper. The wet process was studied on the 4A molecular sieves, activated clay and organic bentonite prepared by using the bentonite from Baiquan (Heilongjiang Province) and Fushun (Liaoning Province). The experimental conditions, including acidity, temperature, time, alkalization, the ratio of liquid to solid and the gel mixtures, etc, were especially discussed the effects on the above products property in the preparation of deeply developing bentonite. It explored the new technique by using pearlite and wasted clay to produce 4A molecular sieves, and made use of all the exhausted acid and alkali in the process.The 4A molecular sieves, activated clay and organic bentonite were charactized by XRD, SEM, IR, TG-DTA and BET, etc, and their properties were tested by calcium exchange capacity, activaity, decolorization and viscosity. The products were accorded with the standard of the country requirement. |
