| 摘要 |
<p>1500216 Recovering non-ferrous metals INCO Ltd 3 March 1975 [2 Aug 1974] 8696/75 Heading C7D In the recovery of one or more of Ni, Co, Cu and Mo from a manganiferous oxide material also containing Fe, particularly deep sea nodules, in which they are present as oxides, the material is reduced, smelted to produce a melt containing the desired metal(s) and a slag containing most of the Mn, after which the slag is removed, the melt is blown with gas containing free O 2 to further reduce the Mn content and the melt is sulphided to form a matte. The matte is blown with gas containing free O 2 to lower the Fe content, and further blown to remove the remaining Fe, after which the melt is granulated for subsequent recovery of the desired metals by conventional methods, e.g. by leaching or carbonyl processes. The reduction step is carried out at 750-1100‹C and reduces the desired metal compound(s) to the metal(s) and MnO 2 to MnO; this step may be carried out in a shaft furnace, rotary kiln or rotary hearth, and liquid, solid (e.g. coke) or gaseous reductants may be used. The sulphiding is effected by adding S, pyrite or pyrrhotite to the melt. Mn may be recovered from the slag by treating with coal, coke, Fe-Si or Si-Mn at a temperature above 1350‹C using limestone or dolomite as a flux.</p> |
