ABSTRACT

Leaching of total rare earth metals from the sea nodule was carried out using H2SO4 solution. Existence of phase of rare earth metals in the sea nodule was confirmed while leaching with different reagents. Concentration of H2SO4 and temperature are found to be critical factors on leaching of REMs. Although there is a high yield of REMs an average of 83.03%, the co-extraction of the other base metals like Fe, Co, Ni, Cu is very high too (average 32.59%) using 3 M H2SO4 at temp. 30 ° C. In particular, an effective and selective extraction (57.6%) of total REMs was observed at H2SO4 concentration of 0.2 M and temp. 45 ° C, in which the co-extractions of other base metals are less.

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