Parameters of recovering cobalt from waste lithium cobaltate battery with P507 extractant and precautions for use of P507 extractant


Release time:

2022-11-01

Source:

network

(1) With P507 extractant and aviation kerosene as diluent, the aluminum in the positive electrode leaching solution of waste lithium ion batteries is extracted, and the separation of cobalt and aluminum in the leaching solution can achieve very ideal results. Under the extraction conditions, the aluminum content in the leaching solution is 0.6 lower than that in the initial solution × 10-7 times, the extraction rate reached 99.6%. The purity of cobalt in the solution is 99.99%.

Parameters of recovering cobalt from waste lithium cobaltate battery with P507 extractant and precautions for use of P507 extractant

Main Process Parameters of Recovering Cobalt from Waste Lithium Cobaltate Battery with P507 Extractant

(1) With P507 extractant and aviation kerosene as diluent, the aluminum in the positive electrode leaching solution of waste lithium ion batteries is extracted, and the separation of cobalt and aluminum in the leaching solution can achieve very ideal results. Under the extraction conditions, the aluminum content in the leaching solution is 0.6 lower than that in the initial solution × 10-7 times, the extraction rate reached 99.6%. The purity of cobalt in the solution is 99.99%.

(2) The optimum conditions for extraction and separation of cobalt and aluminum are: P507 - kerosene 30%, saponification rate 40%, PH=1.7, ratio 0/A=1:1.

(3) Cobalt and aluminum are separated from lithium cobalate leaching solution with P507, and the contrast concentration is 50% and 30% respectively. The results showed that the extraction effect of P507 with 50% and 30% concentration in cobalt aluminum separation was approximately equal.

When P507 with higher concentration is used for extraction, the saponification rate is small, which can achieve better separation effect of cobalt and aluminum, but the disadvantage is that the cost is high;

When using the extractant of P507 machine with low concentration for extraction, the extraction capacity can be improved by increasing the saponification rate, so as to achieve a good cobalt aluminum separation effect. The disadvantage is that the loss of cobalt content in leachate is large at this time.

In industrial application, the extractant concentration of P507 machine should be selected according to the actual situation of cobalt and aluminum content in the leaching solution.

The main functions of extractants include: separation of main metals and impurities metal ions, enrichment of main metal ion concentrations, purification of metal ions, change of anion types, etc. P507 p204 extractant is mainly used for ferrous metal smelting in hydrometallurgy, rare earth and non-metallic solvent extraction. The diluents in the extraction process are Maoming Zhengmao Petrochemical No. 260 solvent oil and sulfonated kerosene. The extraction rate is high and the loss is low. In fact, the toxicity of p204 and P507 is not strong. If the sealing of the extraction equipment is not good or the ventilation of the site is not good, the smell is bad. Bitter. In addition, extractants are mainly used in non-ferrous metal hydrometallurgy industry, such as copper, zinc, cobalt nickel, cadmium, gold and silver, platinum group metals, rare earth and other industries.

Precautions for use of P507 extractor

The extractant of P507 machine should have good selectivity. The extractant shall be able to dissolve the extracted solute well during the extraction process, and be insoluble or insoluble in diluent and other solution components. In the selection of solution components, the extractant should have a clear direction. The extractant shall have good physical properties. This is based on the fact that the physical properties of the extractant will affect the extraction operation. The extractant shall have good chemical stability. Whether the chemical stability of the extractant is intact is directly related to the safety of the extraction process. Therefore, the type with low corrosivity, weak polymerization and decomposition reaction, strong oxidation resistance and thermal stability shall be preferred.