Uranium Recovery And Manganese Removal
From Acid Mine Drainage
Author(s)
A. C. Q. Ladeira & C. R. Gonçalves
Abstract
This work is aimed at the selection of an appropriate adsorbent for uranium and
manganese present in acid mine water drainage. The pH of the acid water is
around 2.7, the uranium concentration is in a range of 9-15mg/L, the manganese
concentration approximately 170mg/L and the sulphate concentration is near
2000mg/L. The uranium in this solution, where sulphate is present in high levels,
is basically in the form of UO2(SO4)3
-4 and the manganese is in the form of Mn+2.
The removal of these elements has been studied using activated carbons,
gibbsite, zeolite, apatite and biological adsorbent. Among all adsorbents tested,
the biological material was the one which presented the best performance taking
into account the necessity of removing Mn and U simultaneously. The maximum
adsorption capacity varied from 10 to 14 mg U.g-1 and 83 to 123mg Mn.g-1. The
results, obtained by column experiments, showed that the sulphate had a
deleterious effect on the uranium recovery by the biological adsorbent. Mn
removal was increased with the increase of pH from 2.6 to 7.0. Adsorption of
these elements by activated carbons, gibbsite, zeolite and apatite was lower if
compared to the biological material.
Keywords: manganese, uranium, adsorption, removal, acid mine.
1 Introduction
Acid mine drainage (AMD) is one of the main environmental problems faced by
the mining industry and, once installed, may last for thousands of years. This
phenomenon occurs due to the oxidation of sulphite minerals when exposed to
oxygen and water, and produces dissolved metals, sulphate and acidity. As well
as having distinct areas with serious AMD generation (coal and uranium mines)
Brazil has other regions that deserve detailed evaluation (copper, gold and nickel
Keywords
manganese, uranium, adsorption, removal, acid mine.
Related Book
Other papers in this volume
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