Selective recovery method of lithium in waste and old lithium iron phosphate batteries

A lithium iron phosphate battery, a selective technology, applied in the direction of battery recycling, waste collector recycling, recycling technology, etc., can solve the problems of reducing the grade of recycled products, high waste water treatment costs, and increasing recycling costs, so as to reduce recycling Cost, Simplified treatment process and difficulty of operation, Effect of reducing acid consumption

Active Publication Date: 2017-06-13
SINO SCI PROCESS BEIJING SCI&TECH CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the above wet leaching method for recovering lithium elements does not achieve selective separation of iron and lithium elements during the leaching process.
On the contrary, the above processes all leach iron and lithium elements at the same time during the leaching process, and then further separate the iron and lithium elements, so the acid consumption is large, a la

Method used

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  • Selective recovery method of lithium in waste and old lithium iron phosphate batteries

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) 100g of battery material powder containing aluminum, iron and lithium obtained by roasting and sorting waste batteries, by adding waste battery powder into NaOH alkali solution, the concentration of alkali solution is 3mol / L, to dissolve aluminum and aluminum oxides , to obtain iron-containing and lithium-containing residues.

[0049] (2) The obtained iron-containing lithium-containing residue is ball-milled to obtain iron-containing lithium-containing powder. The ball milling time is 2 hours, and the size of the iron-containing lithium-containing powder after ball milling is 500 mesh.

[0050] (3) The obtained iron-containing and lithium-containing powder is added to the 2 o 2 Auxiliary oxidation is carried out in an oxidizing medium to convert ferrous iron into ferric iron. The S / L ratio of the leaching slag phase solution is 100g / L, the mass ratio of mixed slag / oxidant is 20, and the oxidation treatment temperature is 25°C

[0051] . The stirring speed of th...

Embodiment 2

[0055] (1) 100g of battery material powder containing aluminum, iron, and lithium obtained by roasting and sorting waste batteries, by adding waste battery powder into KOH alkali solution with a concentration of 2mol / L to dissolve aluminum and aluminum oxides , to obtain iron-containing and lithium-containing residues.

[0056] (2) The obtained iron-containing lithium-containing residue is ball-milled to obtain iron-containing lithium-containing powder. The ball milling time is 2 hours, and the size of the iron-containing lithium-containing powder after ball milling is 500 mesh.

[0057] (3) The obtained iron-containing and lithium-containing powder contains MnO 2 Auxiliary oxidation in an oxidizing aqueous solution converts ferrous iron to ferric iron. The S / L ratio of the leaching slag phase solution is 100g / L, the mass ratio of mixed slag / oxidant is 20, and the oxidation treatment temperature is 25°C. The stirring speed of the oxidation treatment was 200 rpm.

[0058] (...

Embodiment 3

[0061] (1) 100g of battery material powder containing aluminum, iron, and lithium obtained by roasting and sorting waste batteries, by adding the waste battery powder into the ammonia alkali solution, the concentration of the alkali solution is 2mol / L, to dissolve aluminum and aluminum oxides , to obtain iron-containing and lithium-containing residues.

[0062] (2) The obtained iron-containing lithium-containing residue is ball-milled to obtain iron-containing lithium-containing powder. The ball milling time is 2 hours, and the size of the iron-containing lithium-containing powder after ball milling is 500 mesh.

[0063] (3) The obtained iron-containing lithium-containing powder is placed in an aqueous solution and oxidized by oxygen exposure to convert divalent iron into ferric iron. The S / L ratio of the leaching slag phase solution is 100g / L, the mixed slag / oxygen volume ratio is 0.1, the oxidation treatment temperature is 25°C, and the oxidation treatment stirring speed is...

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Abstract

The invention provides a selective recovery method of lithium in waste and old lithium iron phosphate batteries. The method comprises roasting and sorting waste batteries to obtain battery material powder containing aluminum, iron and lithium, removing aluminum to obtain mixed residues containing iron and lithium, carrying out ball milling on the mixed residues containing iron and lithium to obtain powder, carrying out oxidation treatment on the powder under oxidizing conditions/medium so that ferrous iron is converted into ferric iron, wherein pH is adjusted in oxidation treatment and lithium in a ferric hydroxide stable region is selectively leached, and carrying out further treatment to obtain high purity lithium carbonate. The method simplifies a waste battery recycling process and the obtained leachate has low impurity content so that an additional leaching solution purification process is avoided, sodium carbonate solution consumption is reduced and the production of high salt waste water is avoided or greatly reduced. Compared with the prior art, the method has simple processes, realizes a low cost, prevents high salt waste water from the source, can acquire a high purity lithium carbonate product and has an excellent market application prospect.

Description

technical field [0001] The invention belongs to the technical field of recycling of secondary resources and circular economy, and in particular relates to a selective recovery method for lithium in waste lithium iron phosphate batteries. Background technique [0002] Since lithium-ion batteries were successfully developed and commercialized, they have been widely used in many fields such as electronic products, automobiles, and aerospace. Especially in the two major application areas of mobile phones and electric vehicles, the demand for lithium-ion batteries has soared. Lithium iron phosphate batteries have the advantages of abundant raw material sources, low price, high specific capacity, and stable structure, and are considered to be a new generation of lithium-ion batteries. With the widespread use of lithium iron phosphate batteries, a large number of waste batteries will be produced. These waste batteries store a large amount of precious metal elements and have a ver...

Claims

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Application Information

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IPC IPC(8): H01M10/54
CPCH01M10/54Y02W30/84
Inventor 王雪
Owner SINO SCI PROCESS BEIJING SCI&TECH CO LTD
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