A study on the regeneration of lanthanum modified attapulgite

The effects of regeneration pH, time , temperature and regeneration times on the regeneration effect of Lanthanum modified attapulgite (La-ATP) were studied by experiments. The results showed that the alkaline condition was beneficial to La-ATP regeneration. The ideal regeneration rate and loss rate could be achieved at pH 8. The regeneration rate was higher than 90% after 30 min regeneration. Slight increasing of regeneration rate was found when regeneration time was more than 30 minutes. The increase of regeneration temperature enriched the regeneration rate and loss rate of La-ATP. The regeneration rate was higher and the loss rate was lower at 30 ℃. The properties of attapulgite were seriously damaged after 6 times of regeneration. Considering comprehensively, the optimum regeneration conditions were as follows: pH=8, regeneration temperature 30 ℃, regeneration time 30 min, regeneration times 6.