Method for removing iron and aluminum by autoxidation of iron-based waste material containing high-value elements

Abstract

The invention relates to a method for removing iron and aluminum by the autoxidation of iron-based waste material containing high-value elements. The method is characterized by comprising the following steps of: crushing the iron-based waste material, and mixing the crushed iron-based waste material, water and a small amount of acid to ensure that the iron-based waste material in air is in the humid electrolytic atmosphere, performing a series of complex oxidization reactions and electrochemical reactions, and converting simple substance iron or ferrous iron and simple substance aluminum into trivalent oxides or hydroxides; and performing processes of acid dissolving, impurity removal, filtering and the like on the material oxidized by the air to obtain solution which contains high-value elements and in which the iron and the aluminum are removed, and purifying and separating the solution further to obtain a corresponding product containing the high-value elements. The method has the advantages of short process, simple equipment, energy conservation, little using amount of industrial chemicals, high dissolution rate of the high-value elements, mild reaction condition, environment friendliness, and the like.

Description

technical field [0001] The invention relates to a method for naturally oxidizing iron-based waste materials containing high-value elements to remove iron and aluminum, and specifically belongs to the technical fields of resource recycling and hydrometallurgy. Background technique [0002] In order to manufacture more excellent and unique iron-based structural materials and functional materials, a common method is to add alloying elements or alloying alloys to iron-based materials. With the mass production and widespread use of iron-based materials, the amount of iron-based waste is inevitably increasing day by day. These iron-based wastes contain a considerable amount of rare earth, cobalt, nickel, copper and other high-value scarce resources. Therefore, recycling and extracting high-value elements from iron-based waste containing high-value elements (hereinafter referred to as waste or iron-based waste) to realize resource recycling has always been a subject of active expl...

AI Technical Summary

Problems solved by technology

These methods have at least one or more of the following defects: A, large acid consumption, high cost; B, the formation of a large amount of waste water containing iron ions and waste acid that needs to be treated; C, serious environmental pollution; D, can not be fully realized Separation of high-value elements and iron elements, that is, the yield of high-value elements is low; E, ferrous ions are easily oxidized by air and are extracted and continue to be mixed with high-value elements, etc.

The defect of this method is: one, the reaction needs to use nitric acid, not only the cost is higher, but also there is the production of toxic gas NO and NO 2 Second, the reaction time is very long, stirring, ventilating, adding nitric acid dropwise, controlling pH and temperature, not only consumes a lot of power and manpower, but also is difficult to control, which is not conducive to large-scale production

This method also has a long reaction time, stirring, ventilation, and temperature maintenance, which consume a large amount of power, manpower and energy, and the production cost is high; in addition, the ammonium salt of inorganic acid needs to be consumed.

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