A kind of microemulsion system and method for extraction and separation of nickel and lithium

Abstract

The invention discloses a microemulsion system and method for extracting and separating nickel and lithium. The microemulsion system and method for extracting and separating nickel and lithium are characterized in that the microemulsion system comprises surfactant saponification P204, cosurfactant hexyl alcohol and organic phase normal heptane; NaOh is used for saponifying P204 according to steps, and the saponification P204 is prepared into the microemulsion system with other ingredients; microemulsion and an external water phase containing nickel ions and lithium ions are mixed according to the volume ratio of 1:6-10 and put into a water bath constant temperature oscillator after even mixing; oscillation is carried out for 8 minutes at the room temperature with the oscillation frequency of 150 rpm; and the mixture is taken out and then subjected to standing for 4 hours, the water phase is taken and absorbed through atoms to measure the absorbance, and the extraction rate is calculated. The stable microemulsion system is established with the saponification P204 as the surfactant, the hexyl alcohol as the cosurfactant and the normal heptane as the organic phase to separate nickel and lithium; in the method, the dosage of the P204 and the dosage of the organic phase are small, a salting-out agent does not need to be additionally added, so that operation is more simple, the separating speed is increased, and the separating efficiency is greatly improved; and the reverse extraction steps are simple, and the organic phase obtained after reverse extraction can be recycled.

Description

technical field [0001] The invention relates to the technical field of separation of nickel and lithium, in particular to a microemulsion system and method for extracting and separating nickel and lithium, which can be used for the separation of nickel and lithium in waste lithium nickelate batteries. Background technique [0002] The use and disposal of lithium-ion batteries is increasing year by year. According to the survey, more than 1 billion lithium-ion batteries are discarded every year in the world. The reprocessing of waste lithium-ion batteries and the separation and recovery of various metals are an important resource regeneration. Work. One type of positive electrode material in lithium-ion batteries is lithium nickel oxide, which is a lithium nickel-oxide battery. Improper handling of this type of battery will cause waste of nickel and lithium. At present, the main methods for recovering nickel and other precious metals from waste lithium-ion batteries are inci...

AI Technical Summary

Problems solved by technology

One of the key technologies in hydrometallurgy is how to realize the effective separation of ions. The methods used to separate metal ions in the existing hydrometallurgy process mainly include chemical precipitation, ion adsorption and solvent extraction. The addition of excess precipitant will bring new pollution; ion adsorption method often has the disadvantages of poor adsorption selectivity and low yield; solvent extraction solvent extraction method has the advantages of good selectivity, high recovery efficiency, and good separation effect. However, solvent extraction also has the disadvantages of large amount of extractant, long extraction time, and more emulsions used, which is likely to cause waste of resources and increase extraction costs.

Microemulsion extraction and separation of metal ions has the advantages of high separation efficiency, strong selectivity, and wide application range. P204 (i.e., bis(2-ethylhexyl) phosphate) is a commonly used extractant for extraction and separation of metal ions, but in the prior art In the application of P204 as the extraction agent, there are defects such as large amount of extraction agent, long stripping process, and difficult waste liquid treatment, which seriously restrict the development of separating nickel, lithium and other metal ions in waste lithium-ion batteries.

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