Effect Of Mold Gases On The Cation Exchange Capacity Of Sodium Bentonite

In this study the effect of sulfurdioxide, carbondioxide, and ammonia gases, on the cation exchange capacity of ÇANKIRI sodium bentonite used as a binder for foundry molding sand has been investigated. Cation exchange capacity of sodium bentonite samples have been determined in a tempe- rature range of 50°C-350°C being exposed for definite periods to continious gas streams, sodium acetate method has been used to determine cation exchange capacities. It was found that cation exchange capacity decreases from 3.44 % -14.4 % for carbon- dioxide, from 6.28 % - 15.6 % for sulfurdioxide and 6.27 % - 8.7 % for ammonia at the end of 1-00 minutes exposure of gas stream in the temperature range of 50°C - 350°C. It was found that with longer times of exposure and higher temperatures, the sodium hen- tonite would gradually loose its bonding ability and reactivation process would be valuable in order to restore its properties.

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  • Communications Faculty of Sciences University of Ankara Series B Chemistry and Chemical Engineering
Communications Faculty of Sciences University of Ankara Series B Chemistry and Chemical Engineering-Cover
  • ISSN: 1303-6017
  • Başlangıç: 1948
  • Yayıncı: Ankara Üniversitesi