Process for Recovering Ni (II), Cu (II), and Co (II) from an Ammoniacal-ammonium Sulfate Leach Liquor.
Nickel, copper and cobalt are recovered from an ammoniacal ammonium sulfate leach liquor (prepared from laterites containing <1.2 pct ni) by adjusting the ph to 6.75-10 and extracting ni and cu with a solution containing 46-50 pct of a beta-hydroxybenzophenone oxime and 1-2 pct of an aliphatic alpha-hydroxy oxime. The co(III) is converted to co(II) and extracted by a beta-diketone chelating extractant, the preparation of which is disclosed in U.S. Patent 4,152,396. Thus, a ph-adjusted leach liquor containing ni 1, co 0.3, Cu 0.3, Zn 0.02, and (nh4)2so4 294 g/l is extracted at 40 deg c with 12 vol pct lix-64n in kermac 470b. The raffinate containing co 0.3, Zn 0.02, Ni 0.01, and cu <0.001 G/l is contacted with CO shot to reduce co(III) to co(II) and extracted with a solution containing beta-diketone 3, isodecanol 15, and kermac 470b 82 vol pct.
U.S. Pat. 4,258,016, Mar. 24, 1981; Chem. Abstr. 94:107,191F