中国有色冶金

The nickel electrolysis process needs to remove iron. When the sulfuric acid system is used for nickel electrolysis, the yellow sodium iron vitriol method is generally used to remove iron. There are some problems such as a large amount of alkali consumption, the produced iron slag containing high nickel, and the nickel and iron that enter the iron slag difficult recovery. In the treatment of materials containing nickel with nitric acid, a kind of iron slag containing sulfur is produced. In order to recover iron resources from iron slag, this paper analyzes the properties of iron slag. The method of ammonia leaching is proposed for desulfurization, and the ammonia dosage, reaction time and reaction temperature on desulfurization effect are studied. The results show that when the amount of ammonia is 3.0 times, the reaction time is 1h, and the reaction temperature is 85℃, the iron concentrate containing more than 58% iron and less than 0.3% sulfur can be produced. The leaching agent can be recycled in the leaching process, which is a new clean desulphurization technology.