Study on Adsorption of Rare Earth Ions in Solution by Vermiculite
As one of the important strategic resources,rare earth has the reputation of"industrial MSG".However,the low-concentration rare earth ions remaining in the mining process,if not treated,not only waste rare earth resources,but also may cause environmental pollution.The adsorption properties of vermiculite(Ve)on simulated wastewater containing terbium(Tb)and dysprosium(Dy)were studied in this paper.The results show that with the prolongation of the reaction time,the removal rate of rare earth ions in simulated wastewater increases rapidly first and then slowly,and the removal rate of vermiculite(Ve)on simulated wastewater containing terbium(Tb)is higher than that of dysprosium-containing wastewater.The adsorption removal rates of terbium(Tb)and dysprosium(Dy)in simulated wastewater increased with the increase of pH value of the solution.At low pH value,the surface of vermiculite(Ve)adsorbent is protonated,and there is competition between rare earth ions and hydrogen ions in vermiculite(Ve)surface solution.As a result,the adsorption removal efficiency of terbium(Tb)and dysprosium-containing rare earth ions decreases.With the increase of reaction temperature,the adsorption removal rates of terbium(Tb)and dysprosium(Dy)in simulated wastewater decreased,indicating that the adsorption process of vermiculite(Ve)on terbium(Tb)and dysprosium(Dy)in simulated wastewater was exothermic.
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