Method for removing iron from low-nickel sulfonium nitric acid leaching solution through pyrolysis

Abstract

The invention discloses a method for removing iron from a low-nickel sulfonium nitric acid leaching solution through pyrolysis. According to the method, the iron in the nickel / cobalt nitrate solution is removed through a high-temperature pyrolysis method; molten iron is decomposed into Fe2O3.H2O to be precipitated; the iron content of iron slag is greater than 50%, and through simple calcinations, the iron slag can be treated as iron ore concentrate; and the iron slag includes a small amount of valuable metal, and the recovery rate of nickel / cobalt is high. By means of the method, no impurity is introduced into the whole process; the procedure is simple; the application scope is wide; cost is low; subsequent purification can be conducted conveniently; generated nitric oxide can be recycled; and the method is a new environment-friendly iron-removal process which makes breakthrough.

Description

technical field

[0001] The invention belongs to the technical field of nonferrous metal hydrometallurgy, and relates to a method for removing iron from a nickel-cobalt nitrate solution, in particular to a method for removing iron from a nitrate solution containing nickel, copper and iron with relatively high and complex components . Background technique

[0002] Low-nickel matte is the product of oxidative smelting of the beneficiation concentrate of nickel sulfide ore. The iron content in low-nickel matte is about 1 to 1.5 times that of nickel. After leaching low-nickel matte with nitric acid, the typical composition of the leaching solution obtained is (g / L): Ni 50~60, Co 1~2, Cu30~35, Fe 50~60, NO 3 - 280~300. In the leaching solution, iron exists in the form of positive ferric ions, and there is a certain leaching residual acid. Therefore, the oxidation-reduction potential of the leaching solution is usually above 700mv.

[0003] In the traditional hydrometallurgic...

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