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Heavy Cations Removal from Acid Mine Drainages and Mineral Industries Wastes, Using Natural and Synthetic Inorganic Sorbents

Authors:
[ H. Ghasemi ] - Jaber Ibn Hayan Research Laboratory, Atomic Energy Organization of Iran (AEOI),
[ H. Kazemian ] - Jaber Ibn Hayan Research Laboratory, Atomic Energy Organization of Iran (AEOI),
[ M. R. Pakzad ] - Jaber Ibn Hayan Research Laboratory, Atomic Energy Organization of Iran (AEOI),
[ A. Malekinejad ] - Jaber Ibn Hayan Research Laboratory, Atomic Energy Organization of Iran (AEOI),

Abstract:

Acid Mine Drainage (AMD) and liquid wastes of mines and mineral industries contain heavy metal cations and most of them are poisoning and harmful for human. In this study some of them are removed from simulated waste. Iranian natural clinoptilolite was converted to synthetic zeolite A and P in hydrothermal condition and was used. Cation exchange capacities of natural and synthetic samples were determined. The effects of contact time, temperature and pH on the ion exchange reaction were also investigated. Lead uptake percentage was higher than other cations on the synthetic samples and increasing the temperature and pH has no remarkable effect on ion exchange. Cadmium showed suitable result and it was found that increasing the temperature led to higher removal efficiency and decreasing the pH reduces its sorption. Although, zinc showed good exchange but its result was lower than other investigated cations. Increasing the temperature increases the ion exchange. In comparison to the other cations, nickel didn't show suitable results, specially in the higher concentrations.

Keywords:

Acid Mine Drainage, Waste, Clinoptilolite, Zeolite A, Zeolite P, Heavy Metals