Cobalt and nickel purifying method based on waste battery metal recovery technology

Abstract

The invention discloses a cobalt and nickel purifying method based on a waste battery metal recovery technology, and belongs to the field of waste battery recovery. The cobalt and nickel purifying method based on the waste battery metal recovery technology comprises the step of recovery of ternary battery waste residues, the original waste battery metal recovery technology is improved, on the onehand, the impurity removal rate for iron ions can be higher than an impurity removal technology for the iron ions in the prior art, meanwhile, the impurity removal efficiency for the iron ions can beimproved, the recovery purity of cobalt and nickel is increased, the progress of the whole technology is accelerated, and the recovery efficiency is improved; on the other hand, compared with the prior art, the method has the advantages that detection of metal impurities in a solution after impurity removal operation is increased, the reaction phenomenon produced in the solution has the feedback effect, impurities can be removed more thoroughly, and the recovery purity of the metal cobalt and the metal nickel is further improved.

Description

technical field [0001] The invention relates to the field of waste battery recycling, and more specifically, relates to a method for purifying cobalt and nickel based on a waste battery metal recycling process. Background technique [0002] The technical route for the recycling and reuse of ternary battery materials is: 1. Pickling with inorganic acid; 2. Removing impurities from copper, aluminum and iron; 3. Extraction and recovery of nickel and cobalt; 4. Obtaining nickel and cobalt products. In the above-mentioned metal recovery process, the main researches are: ①The type, concentration and acid leaching time of inorganic acid; ②The process for removing impurities such as copper, aluminum and iron suitable for this system; ③Extraction process for recovering nickel and cobalt. [0003] In the existing waste battery metal recycling process, when removing impurities from metals, especially iron, the jarosite method is generally used—in a solution containing ferric ions, the ...

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Problems solved by technology

[0003] In the existing waste battery metal recycling process, when removing impurities from metals, especially iron, the jarosite method is generally used—in a solution containing ferric ions, the pH value is adjusted When the solution is heated to 1.6-1.8, and the solution is heated to 85-95 ° C, adding sodium sulfate, there will be light yellow jarosite crystals precipitated, the crystal particles are coarse, the precipitation speed is fast, and it is easy to filter, but after removing the solution At the same time, the acid production in the reaction process will reduce the pH value of the solution, which will affect the reaction and precipitation of iron ions, so that the iron ions in the later stage of the reaction cannot be removed, which will affect the purity of the extraction of cobalt and nickel.

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