A method for recycling nickel, cobalt and manganese from a feed liquid containing nickel, cobalt and manganese, the method comprising: (1) subjecting the feed liquid to a first extraction to obtain an aqueous phase 1 and an organic phase 1; (2) subjecting the aqueous phase 1 to a second extraction to obtain an organic phase 2 and an aqueous phase 2 having a pH value of 5-7.5; and (3) successively subjecting the organic phase 2 to washing and reverse extraction to obtain a solution containing nickel, cobalt and manganese, wherein an extractant A used in the second extraction comprises a carboxylic acid extractant.

A method for recycling nickel, cobalt and manganese from a feed liquid containing nickel, cobalt and manganese, the method comprising: (1) subjecting the feed liquid to a first extraction to obtain an aqueous phase 1 and an organic phase 1; (2) subjecting the aqueous phase 1 to a second extraction to obtain an organic phase 2 and an aqueous phase 2 having a pH value of 5-7.5; and (3) successively subjecting the organic phase 2 to washing and reverse extraction to obtain a solution containing nickel, cobalt and manganese, wherein an extractant A used in the second extraction comprises a carboxylic acid extractant.

The present disclosure discloses a wet process for recovering valuable metals from a lithium battery. In the method, a waste lithium battery powder is subjected to selective leaching under the condition that a hydrogen sulfide gas is introduced through pressurization, such that Mn.sup.2+, Li.sup.+, and Al.sup.3+ metal ions enter a first-stage leaching liquor and nickel, cobalt, copper, and iron exist in a first-stage leaching residue in the form of a sulfide; then a pH of the first-stage leaching liquor is adjusted to remove aluminum and manganese, which achieves extremely thorough metal separation and leads to relatively pure products; a first-stage leaching residue is subjected to leaching in an acid liquor under a negative pressure, such that the sulfides of nickel, cobalt, iron, and copper are dissolved in a second-stage leaching liquor, and a hydrogen sulfide gas produced can be recycled in the first-stage leaching procedure through pressurization.

The present disclosure discloses a wet process for recovering valuable metals from a lithium battery. In the method, a waste lithium battery powder is subjected to selective leaching under the condition that a hydrogen sulfide gas is introduced through pressurization, such that Mn.sup.2+, Li.sup.+, and Al.sup.3+ metal ions enter a first-stage leaching liquor and nickel, cobalt, copper, and iron exist in a first-stage leaching residue in the form of a sulfide; then a pH of the first-stage leaching liquor is adjusted to remove aluminum and manganese, which achieves extremely thorough metal separation and leads to relatively pure products; a first-stage leaching residue is subjected to leaching in an acid liquor under a negative pressure, such that the sulfides of nickel, cobalt, iron, and copper are dissolved in a second-stage leaching liquor, and a hydrogen sulfide gas produced can be recycled in the first-stage leaching procedure through pressurization.

The present disclosure belongs to the technical field of lithium battery recycling, and discloses a method for separating and recovering valuable metals from waste ternary lithium batteries. The method includes the following steps: adding a persulfate to a waste ternary lithium battery powder, and conducting oxidative acid leaching to obtain a leaching liquor and a leaching residue; adding an alkali to the leaching liquor to allow a precipitation reaction; adding a sulfide salt to allow a reaction; adjusting a pH to allow a precipitation reaction to obtain a nickel hydroxide precipitate and a liquid phase A; adding a carbonate to the liquid phase A to allow a reaction, and conducting solid-liquid separation (SLS) to obtain lithium carbonate; and subjecting the leaching residue to calcination, adding a chlorate, heating a resulting mixture, and conducting SLS to obtain manganese dioxide.

The present disclosure belongs to the technical field of lithium battery recycling, and discloses a method for separating and recovering valuable metals from waste ternary lithium batteries. The method includes the following steps: adding a persulfate to a waste ternary lithium battery powder, and conducting oxidative acid leaching to obtain a leaching liquor and a leaching residue; adding an alkali to the leaching liquor to allow a precipitation reaction; adding a sulfide salt to allow a reaction; adjusting a pH to allow a precipitation reaction to obtain a nickel hydroxide precipitate and a liquid phase A; adding a carbonate to the liquid phase A to allow a reaction, and conducting solid-liquid separation (SLS) to obtain lithium carbonate; and subjecting the leaching residue to calcination, adding a chlorate, heating a resulting mixture, and conducting SLS to obtain manganese dioxide.

The present disclosure discloses a recycling method for a mixed waste material of lithium nickel manganese cobalt oxide (LNMCO) and lithium iron phosphate (LFP), including: conducting acid-leaching to obtain an acid-leaching liquor with nickel, cobalt, manganese, phosphorus, iron, and lithium; conducting adsorption separation with a resin, washing the resin with sulfuric acid to obtain a mixed solution of nickel sulfate, cobalt sulfate, and manganese sulfate, and subjecting the mixed solution to precipitation to obtain an LNMCO cathode material precursor; and subjecting an obtained solution with phosphorus, iron, and lithium to lithium precipitation to obtain a lithium salt precipitate, and subjecting a post-precipitation solution to concentration and electrospinning to obtain a ferric phosphate/carbon material. The process of the present disclosure can achieve comprehensive recycling of a mixed waste material of LNMCO and LFP and the directed circulation of waste LNMCO and LFP materials.

Provided are a carboxylic acid compound of formula I, and a preparation method therefor and application thereof. When being applied to the extraction and separation of metal ions, the carboxylic acid compound can achieve a high separation coefficient, low back extraction acidity, high load rate, high back extraction rate, high stability, and low water solubility, so that the extraction process is stable, and environmental pollution and components can be reduced. The present application can be used in various systems such as ternary battery recycling and battery-grade nickel sulfate preparation.

A method for producing mixed metal salts containing manganese ions and at least one of cobalt ions and nickel ions, the method including: an Al removal step of subjecting an acidic solution containing at least manganese ions and aluminum ions, and at least one of cobalt ions and nickel ions, to removal of the aluminum ions by extracting the aluminum ions into a solvent, the acidic solution being obtained by subjecting battery powder of lithium ion batteries to a leaching step; and a precipitation step of neutralizing an extracted residual liquid obtained in the Al removal step under conditions where a pH is less than 10.0, to precipitate mixed metal salts comprising a metal salt of manganese and a metal salt of at least one of cobalt and nickel.

What is provided is a method for separating cobalt and nickel including: a crushing and sorting step of crushing and classifying the lithium ion secondary battery to obtain an electrode material containing at least cobalt, nickel, copper, and lithium; a leaching step of immersing the electrode material in a processing liquid containing sulfuric acid and hydrogen peroxide to obtain a leachate; a copper separation step of adding a hydrogen sulfide compound to the leachate with stirring and subsequently carrying out solid-liquid separation to obtain an eluate containing cobalt and nickel and a residue containing copper sulfide; and a cobalt/nickel separation step of adding an alkali metal hydroxide to the eluate to adjust a pH and subsequently, adding a hydrogen sulfide compound with stirring and carrying out solid-liquid separation to obtain a precipitate containing cobalt sulfide and nickel sulfide and a residual liquid containing lithium.