EXTRACTION METHOD FOR REMOVING ALUMINUM FROM TERNARY BATTERY MATERIAL LEACHATE

Abstract

Disclosed is a method for removing aluminum in a ternary battery material leachate by adopting an extraction method, which comprises the following steps: (1) saponification: mixing an extraction solvent with a saponifying agent to obtain a saponified extraction solvent; (2) extraction: mixing the ternary battery material leachate with the saponified extraction solvent to obtain a loaded organic phase and a raffinate; (3) back extraction: mixing the loaded organic phase with a back-extraction agent, followed by performing a back-extraction to obtain an organic phase and a back-extraction solution; the extraction solvent comprises an extracting agent and a diluent. The extraction method is adopted to separate nickel, cobalt, manganese and aluminum, having the advantages of less heavy metal entrainment, short process flow, and high metal recovery rate. The extraction rate of the aluminum can reach 97.42 percent.

Claims

1. An extraction method for removing aluminum from a ternary battery material leachate, comprising the following steps: (1) mixing an extraction solvent with a saponifying agent to obtain a saponified extraction solvent; the extraction solvent comprises an extracting agent and a diluent; (2) mixing the ternary battery material leachate with the saponified extraction solvent to obtain a mixture I, performing an extraction to the mixture I to obtain a loaded organic phase and a raffinate; (3) mixing the loaded organic phase with a back-extraction agent to obtain a mixture II, performing a back-extraction to the mixture II to obtain an organic phase and a back-extraction solution; wherein the extracting agent is an acidic extracting agent; the diluent is at least one selected from the group consisting of kerosene, n-hexane, cyclohexane, octanol, and 2-octanol; and the extraction solvent comprises the extracting agent and the diluent in a volume ratio of (0.01-0.4): 1.

2. The extraction method of claim 1, wherein in step (1), the saponifying agent is a sodium salt; wherein the sodium salt is sodium hydroxide.

3. The extraction method of claim 1, wherein the ternary battery material leachate comprises Ni.sup.2+, Co.sup.2+, Mn.sup.2+, Al.sup.3+, Ca.sup.2+, Mg.sup.2+, Li.sup.+, SO.sub.4.sup.2-, and does not comprise Fe.sup.2+ and Zn.sup.2+; the ternary battery material leachate has an A1.sup.3+ concentration falling within 3.0-7.0 g/L; the ternary battery material leachate has an total concentration of Ni.sup.2+, Co.sup.2+ and Mn.sup.2+ falling within 50-70 g/L.

4. The extraction method of claim 1, wherein a washing procedure is further included between step (2) and step (3), in the washing procedure, the loaded organic phase is washed with sulfuric acid or the back-extraction solution; wherein in step (2), the extraction is a single-stage extraction or a multi-stage countercurrent extraction.

5. The extraction method of claim 1, wherein in step (3), the back-extraction agent is selected from the group consisting of hydrochloric acid, sulfuric acid, and acetic acid.

6. A method for metallic material recovery, comprising using the extraction method according to claim 1.

7. A method for metallic material recovery, comprising using the extraction method according to claim 2.

8. A method for metallic material recovery, comprising using the extraction method according to claim 3.

9. A method for metallic material recovery, comprising using the extraction method according to claim 4.

10. A method for metallic material recovery, comprising using the extraction method according to claim 5.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0032] The sole the FIGURE is the process flow chart of the present disclosure.

DETAILED DESCRIPTION OF THE ILLUSTRATED EXAMPLES

[0033] In order to fully understand the present disclosure, some experimental schemes of the present disclosure will be described below in conjunction with examples to further illustrate the characteristics and advantages of the present disclosure. Any change or alteration that does not deviate from the gist of the present disclosure can be understood by those skilled in the art. The scope of protection of the present disclosure is determined by the scope of the claims. The sole the FIGURE shows the process flow chart in the examples of the present disclosure.

Example 1

[0034] A method for removing aluminum in a ternary battery material leachate by adopting an extraction method comprises the following steps: [0035] (1) saponification: preparing an extraction solvent for extracting aluminum: mixing bis (2,4, 4-trimethylpentyl) phosphinic acid and kerosene according to a volume ratio of 1:4 to prepare an extraction solvent (a blank organic phase) for extracting aluminum; mixing the extraction solvent with a saponifying agent (concentrated alkali solution) to obtain the saponified extraction solvent, in which the saponification rate was 45%; [0036] (2) Extraction: mixing 50 mL aluminum-containing solution (wherein Al.sup.3+ is 6.4 g/L, Ni.sup.2+ is 27.17 g/L, Co.sup.2+ is 16.29 g/L and Mn.sup.2+ is 9.81 g/L) with 50 mL of the saponified extraction solvent followed by performing an extraction at temperature of 40° C. for 5 min to obtain an loaded organic phase and a raffinate. Al.sup.3+ in the raffinate was detected to be 3.4 g/L, and the single-stage extraction rate of Al was 46.88%; [0037] (3) Back-extraction: mixing the loaded organic phase with 10 mL of 2 mol/L sulfuric acid, followed by phase separating to obtain an organic phase and a back-extraction solution, wherein Al.sup.3+ in the back-extraction solution is 14.95 g/L, Ni.sup.2+ is 0.017 g/L, Co.sup.2+ is 0.002 g/L and Mn.sup.2+is 0.011 g/L;

[0038] Under the same condition, the selectivity of an organic system to Al in the method using di (2,4,4-trimethyl amyl) phosphinic acid as the extracting agent is higher than that in the method using naphthenic acid, and the extraction rate of nickel, cobalt and manganese is much lower.

Example 2

[0039] A method for removing aluminum in a ternary battery material leachate by adopting an extraction method comprises the following steps: [0040] (1) saponification: preparing an extraction solvent for extracting aluminum: mixing bis (2,4,4-trimethylpentyl) phosphinic acid and kerosene according to the volume ratio of 1:4 to prepare an extraction solvent (a blank organic phase) for extracting aluminum, mixing the extraction solvent with a saponifying agent (concentrated alkali solution) to obtain the saponified extraction solvent, in which the saponification rate was 45%; [0041] (2) Extraction: mixing 50 mL aluminum-containing solution (wherein Al.sup.3+ is 6.4 g/L, Ni.sup.2+ is 27.17 g/L, Co.sup.2+ is 16.29 g/L and Mn.sup.2+ is 9.81 g/L) with 50 mL of the saponified extraction solvent, followed by performing a 5-stage countercurrent extraction to obtain an loaded organic phase and a raffinate. Al.sup.3+ in the raffinate was detected to be 0.208 g/L, and the 5-stage countercurrent extraction rate of Al was 96.75%; [0042] (3) Back extraction: mixing the loaded organic phase with 10 mL of 4 mol/L sulfuric acid, followed by phase separating to obtain an organic phase and a back-extraction solution, wherein Al.sup.3+ in the back-extraction solution is 30.58 g/L, Ni.sup.2+ is 0.007 g/L, Co.sup.2+ is 0.002 g/L and Mn.sup.2+is 0.009 g/L.

Example 3

[0043] A method for removing aluminum in a ternary battery material leachate by adopting an extraction method comprises the following steps: [0044] (1) saponification: preparing an extraction solvent for extracting aluminum: mixing bis (2,4,4-trimethylpentyl) phosphinic acid and kerosene with a volume ratio of 1:4 to prepare an extraction solvent (a blank organic phase) for extracting aluminum, mixing the extraction solvent with a saponifying agent (concentrated alkali solution) to obtain a saponified extraction solvent, in which the saponification rate was 45%; [0045] (2) Extraction: mixing 50 mL aluminum-containing solution (wherein Al.sup.3+ is 6.4 g/L, Ni.sup.2+ is 27.17 g/L, Co.sup.2+ is 16.29 g/L and Mn.sup.2+ is 9.81 g/L) with 50 mL of the saponified extraction solvent, followed by performing a 4-stage countercurrent extraction to obtain an loaded organic phase and a raffinate. Al.sup.3+ in the raffinate was detected to be 0.165 g/L, and the 4-stage countercurrent extraction rate of Al was 97.42%; [0046] (3) Back-extraction: mixing the loaded organic phase with 10 mL of 4 mol/L sulfuric acid, followed by phase separating to obtain an organic phase and a back-extraction solution, wherein Al.sup.3+ in the back-extraction solution is 31.03 g/L, Ni.sup.2+ is 0.010 g/L, Co.sup.2+ is 0.004 g/L and Mn.sup.2+is 0.007 g/L.

Comparative Example 1

[0047] A method for removing aluminum in a ternary battery material leachate by adopting an extraction method comprises the following steps: [0048] (1) saponification: preparing an extraction solvent for extracting aluminum: mixing Naphthenic acid and kerosene with a volume ratio of 1:4 to prepare an extraction solvent (a blank organic phase) for extracting aluminum, mixing the extraction solvent with a saponifying agent (concentrated alkali solution) to obtain a saponified extraction solvent, in which the saponification rate was 45%; [0049] (2) Extraction: mixing 50 mL aluminum-containing solution (wherein Al.sup.3+ is 6.4 g/L, Ni.sup.2+ is 27.17 g/L, Co.sup.2+ is 16.29 g/L and Mn.sup.2+ is 9.81 g/L) with 50 mL of the saponified extraction solvent, followed by performing an extraction at temperature of 40° C. for 5 min to obtain an loaded organic phase and a raffinate. Al.sup.3+ in the raffinate was detected to be 3.8 g/L, and the single stage extraction rate of Al was 40.63%; [0050] (3) Back-extraction: mixing the loaded organic phase with 10 mL of 2 mol/L sulfuric acid, followed by phase separating to obtain an organic phase and a back-extraction solution, wherein Al.sup.3+ in the back-extraction solution is 12.96 g/L, Ni.sup.2+ is 2.15 g/L, Co.sup.2+ is 0.94 g/L and Mn.sup.2+is 1.04 g/L.

[0051] Naphthenic acid was used as an extracting agent, and after the single stage extraction, the extraction rate of Al was 40.63%, but the amount of the adsorbed heavy metals was also high.

Comparative Example 2

[0052] A method for removing aluminum in a ternary battery material leachate by adopting an extraction method comprises the following steps: [0053] (1) saponification: preparing an extraction solvent for extracting aluminum: mixing naphthenic acid and kerosene with a volume ratio of 1:3 to prepare an extraction solvent (a blank organic phase) for extracting aluminum, mixing the extraction solvent with a saponifying agent (concentrated alkali solution) to obtain a saponified extraction solvent, in which the saponification rate was 45%; [0054] (2) Extraction: mixing 50 mL aluminum-containing solution (wherein A1.sup.3+ is 6.4 g/L, Ni.sup.2+ is 27.17 g/L, Co.sup.2+ is 16.29 g/L and Mn.sup.2+ is 9.81 g/L) with 50 mL of the saponified extraction solvent, followed by performing a 4-stage countercurrent extraction to obtain an loaded organic phase and a raffinate. Al.sup.3+ in the raffinate was detected to be 0.35 g/L, and the single stage extraction rate of Al was 94.53%; [0055] (3) Back-extraction: mixing the loaded organic phase with 10 mL of 2 mol/L sulfuric acid, followed by phase separating to obtain an organic phase and a back-extraction solution, wherein Al.sup.3+ in the back-extraction solution was 31.03 g/L, Ni.sup.2+ is 0.010 g/L, Co.sup.2+ is 0.94 g/L and Mn.sup.2+is 0.007 g/L.

[0056] Naphthenic acid was used as an extracting agent, and after the 4-stage extraction, the extraction rate of Al was 94.53%, but the amount of the adsorbed heavy metals was also high.

Comparative Example 3

[0057] A method for removing aluminum in a ternary battery material leachate by adopting an extraction method comprises the following steps: [0058] (1) saponification: preparing an extraction solvent for extracting aluminum: mixing bis(2-ethylhexyl) phosphate and kerosene with a volume ratio of 1:4 to prepare an extraction solvent (a blank organic phase) for extracting aluminum, mixing the extraction solvent with a saponifying agent (concentrated alkali solution) to obtain a saponified extraction solvent, in which the saponification rate was 45%; [0059] (2) Extraction: mixing 50 mL aluminum-containing solution (wherein Al.sup.3+ is 6.4 g/L, Ni.sup.2+ is 27.17 g/L, Co.sup.2+ is 16.29 g/L and Mn.sup.2+ is 9.81 g/L) with 50 mL of the saponified extraction solvent, followed by performing a 4-stage countercurrent extraction to obtain an loaded organic phase and a raffinate. Al.sup.3+ in the raffinate was detected to be 2.29 g/L, and the single stage extraction rate of Al was 35.78%; [0060] (3) Back-extraction: mixing the loaded organic phase with 10 mL of 2 mol/L sulfuric acid, followed by phase separating to obtain an organic phase and a back-extraction solution, wherein Al.sup.3+ in the back-extraction solution is 12.96 g/L, Ni.sup.2+ is 2.15 g/L, Co.sup.2+ is 0.94 g/L and Mn.sup.2+is 1.04 g/L.

[0061] Bis(2-ethylhexyl) phosphate was used as an extracting agent, and after the single stage extraction, the extraction rate of Al can reach 35.78%, but the extraction rate is relatively low and the amount of the adsorbed heavy metals was also high.

[0062] The above embodiments are preferred mode of the present disclosure, but the present disclosure is not limited to the above embodiments, and any other alternation, modifications and simplifications which do not depart from the spirit and principle of the present disclosure should be construed as equivalents thereof, and are included in the scope of the present disclosure.