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Recovery of Metals from Atlantic Sea Nodules.
U S Pat 4 208 379 1980 Jun; :
Nickel, cobalt, and manganese are recovered from deep-sea nodules by pretreatment with acetic acid, followed by leaching with h2so3. The acetic acid pretreatment removes much of the calcareous and carbonaceous material from the nodules, improves leachability, and decreases consumption of sulfur dioxide. Thus, 400 g of nodules containing fe 46, mn 61.6, Al2o3 16.8, Mgo 16.4, Cao 56.4, Sio2 15.6, Co32- 70, cu 0.52, Ni 2.04, and CO 1.2 G, were reacted with 2 l of 0.8M ch3cooh for 1 h. After filtration, analysis of the residue (314 g) showed that mg 33, ca 42.1, and co32- 35 pct had been removed, while essentially all of the other elements remained in the resiude. Twenty grams of the residue was reacted with 200 ml h2o containing 0.42 Mol so2 for 10 min. After filtering, the solution contained recoveries of ni 89.2, Co 95.3, Cu 49.6, Mn 95.7, Fe 40.8, Al 54.6, Ca 78.4, and mg 86.4 pct. Chem. Abstr. 93:118,080Z (see also chem. Abstr. 92:45,321W) nickel, cobalt, and manganese are selectively recovered from nodules by treatment with acetic acid, followed by leaching with h2so3. The calcareous and carbonaceous material is removed by pretreatment with 0.75-0.85M acetic acid at 4.5-5.5 Ml acid/g nodules. Thus, nodules ground to -200 mesh and containing fe 46, mn 61.6, Al2o3 16.8, Mgo 16.4, Cao 56.4, Sio2 15.6, Co32- 70, cu 0.52, Ni 2.04, and CO 1.2 G/400 g sample were reacted with 2 l 0.8M ch3cooh at room temperature for 1 h. The slurry was filtered and washed, and analysis showed that 33, 42.1, and 35 pct of the mg, ca, and co32-, resp
U.S. Pat. 4,208,379; June 17, 1980; Chem. Abstr. 92:45,321W
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