METHOD FOR RECYCLING IRON, SCANDIUM, AND ALUMINUM FROM LIMONITE TYPE LATERITIC NICKEL ORES

摘要

Disclosed are a method for efficiently recycling iron, scandium, and aluminum from limonite type lateritic nickel ores, comprising: crushing or finely grinding the limonite type laterite nickel ores to obtain ore powder; selectively leaching the ore powder by using nitric acid to obtain sulfur-free iron ore concentrates of which the iron content exceeds 60%; performing controllable sedimentation/separation operations on a leach solution by adding magnesium oxide, or calcium oxide, or calcium carbonate, so that an aluminum-scandium mixture is obtained; after roasting dehydration of the aluminum-scandium mixture, adding the approximate amount of cryolite and performing molten salt electrolysis to directly prepare an aluminum-scandium alloy; and performing controllable sedimentation/separation on the subsequent solution, and preparing nickel-cobalt hydroxide products by neutralizing or performing extraction-electrodeposition to prepare nickel-cobalt products. According to the present invention, under mild conditions without external pressurization, efficient iron, scandium, and aluminum recovery and utilization can be achieved while selective nickel and cobalt leaching is ensured, both the nickel and cobalt leaching rates can reach above 90%, the iron and scandium recovery rates can reach above 95%,and the aluminum recovery rate can reach 65%. Therefore, the present invention well achieves efficient recovery and utilization of iron, scandium, aluminum, nickel, and cobalt in the limonite type lateritic nickel ores.