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A study of extraction of metals from deep-sea manganese nodules was made by the sulfating roasting with SO2 gas in a temperature range from 100 to 1, 000°C followed by the water leaching. The effects of roasting conditions on the extraction percentages of Ni, Co, Cu, Mn and Fe by the water leaching were investigated. The selective extraction of Ni, Co and Cu from the roasted ore was also attempted by the ammonia leaching. The results obtained are summarized as follows.The highest degree of sulfation of manganese nodules was effected using a SO2: O2=2: 1 gas mixture at 400°C. The extraction percentages of Mn, Co, Ni, Cu and Fe by the water leaching of the roasted ore were about 90%, 90%, 70%, 70% and 0%, respectively.When the roasted ore was leached in an ammoniacal solution, selective extraction of Ni, Co and Cu was greater using higher concentrations of ammonium ion. Under optimum conditions of ammonia leaching, the extraction percentages of Ni, Co, Cu, Mn and Fe were about 70%, 70%, 70%, 5% and 5%, respectively.

Sulfating Roasting of Manganese Nodules and Selective Leaching of Roasted Ore.