Study on adsorption properties of attapulgite clay to uranium in waste water

摘要

This test studied the behaviors of adsorbing uranium of attapulgite. Meanwhile the exchange column filled with attapulgite was used to treat the wastewater containing uranium in laboratory. The percentage of removal of U was above 99.95% and the residual concentration of uranium was below the state specified discharge standard (0.05 mg/l). The uranium adsorbed in column could be desorbed by 5% HCl. The eluant was neutralized with ammonia water. Ammonium diuranate commonly called yellow cookie was obtained. The exchange column eluted by pure water could be used once again. In this way, large amount of waste water was able to be treated by simple operation with low cost. If large exchange column or multicolumn connected in series was used, the effect of removing uranium would be better, which could reach the state specified dischange standard and is worthy to be used widely.