Process for the hydrometallurgical recovery of nickel from two different types of nickel stone

摘要

PCT No. PCT/FI96/00432 Sec. 371 Date Feb. 5, 1998 Sec. 102(e) Date Feb. 5, 1998 PCT Filed Aug. 6, 1996 PCT Pub. No. WO97/07248 PCT Pub. Date Feb. 27, 1997The invention relates to a method for recovering nickel in one and the same process from two pyrometallurgically produced nickel mattes, one of which contains a remarkable percentage or iron. The leaching of iron-bearing nickel matte is carried out in one step by conducting solution from the leaching cycle of a less iron containing matte into the leaching of a more iron containing matte at a stage where the iron of the less iron containing matte is in soluble form. The iron contained in the mattes is advantageously precipitated as jarosite and the solution created in the leaching of the more iron containing matte is conducted back into the leaching cycle of the less iron containing matte.