Method for recovering and extracting lithium

Abstract

The invention provides a lithium recovery and extraction method. The method mainly comprises the steps that sulfuric acid is used for soaking powder of matter to be recovered, obtained impregnation liquid is filtered, and the pH is adjusted; solid alkali metal hydroxide is utilized for preparing a saponification organic solvent; and the impregnation liquid is added into the saponification organicsolvent, oscillation is performed, and then a water phase is collected. According to the method, the solid alkali metal hydroxide is utilized for obtaining the saponification organic solvent (an oil phase), accordingly, a large amount of alkali metal matter exists in the oil phase, when the water phase impregnation liquid with a certain pH value is added into the oil phase, the oil phase can be used for extracting a large amount of other elements while the lithium element is kept in the water phase, an existing lithium element extraction operation process is simplified, in addition, producingof a large amount of precipitation of hydroxide is avoided, accordingly, output of sludge is controlled, a container is kept clean, and the aftertreatment load is greatly reduced; and in addition, theremnant oil phase after the lithium element is extracted can also be used for further separating other elements through acid pickling, elements are recycled as much as possible, and meanwhile, the oil phase can be recycled.

Description

technical field [0001] The invention relates to metal element recovery technology, in particular to a lithium element recovery and extraction method. Background technique [0002] With the improvement of environmental awareness and the threat of depletion of many resources, recycling technology is getting more and more attention. For example, batteries have become an indispensable consumer product in modern life, with an annual consumption of 8 billion, especially lithium-ion batteries. Due to its high energy density and fast charging speed, it has been developed rapidly and widely used, resulting in a large number of waste batteries that need to be disposed of urgently. For the recycling of batteries, especially the collection of various chemical components such as iron, cobalt, magnesium, manganese, nickel, zinc, lithium, etc., has attracted attention because it meets the needs of circular economy and green economy. Recovery methods include pyrometallurgy, hydrometallurgy...

AI Technical Summary

Problems solved by technology

In the process of adjusting the pH, a large amount of alkaline substances such as sodium hydroxide solid or solution are often added, resulting in the enlargement of the solution volume and the generation of a large amount of sediment, resulting in an increase in post-treatment load and an increase in sludge treatment costs.

In addition, waste treatment, recycling battery treatment or other raw material treatment with multi-element components can easily cause serious co-extraction effects and lose a large amount of other elements, especially when the elements in the raw material to be extracted are complex, it may be possible to simply extract a single element. Cause multiple elements to interfere at the same time and cannot be effectively purified

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