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Abstract

The manganese deposits of Northern Latium (Province of Rome and Viterbo) occur in a volcanic environment. Open pit mining ensures low mining costs. However, attempts to upgrade the ore by conventional methods have not given satisfactory results. The main reasons for the low grade of concentrates and the poor recovery are: the very fine liberation size; the nature of the manganese minerals (strongly hydrated colloidal gels); the intimate association between manganese minerals and gangue minerals (pyroclastic materials). Acid leaching tests were made; they showed that high recoveries (over 90%) are possible from the ore. Moreover it was found that differences in lithological species, which may be encountered in the same area, do not pose any feed problems where a more flexible hydrometallurgical plant is concerned. Operating conditions are not heavy, since a temperature of 25-50 degrees C and an average treatment time of one hour is sufficient to achieve high manganese recovery. Research work will continue with the development of new leaching technology (heap or in place leaching).

Additional information

Authors: ABBRUZZESE C CNR, ISTITUTO PER IL TRATTAMENTO DEI MINERALI, ROMA (ITALY), CNR, ISTITUTO PER IL TRATTAMENTO DEI MINERALI, ROMA (ITALY)
Bibliographic Reference: WORKSHOP ON MINERALS LEACHING, BRUXELLES (BELGIUM), NOV. 17, 1983 PP. 132-138 EUR 9606 EN-FR (1984) FS, 141 P., BFR 450, EUROFFICE, LUXEMBOURG, POB 1003
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