Aminophosphonate compound, and application thereof in extraction of lithium in alkaline solution containing lithium ions

Abstract

The invention provides an aminophosphonate compound, and application thereof in extraction of lithium in an alkaline solution containing lithium ions, and relates to the technical field of metal ion extraction. The structure of the aminophosphonate compound is as shown in formula (I). In the formula (I), R1 is a straight chain of C1-C20 straight-chain or branched-chain alkyl, C1-C20straight-chain or branched-chain alkoxy, or C6-C10 aryl; R2 and R3 are respectively and independently hydrogen, C1-C10 straight-chain or branched-chain alkyl, C1-C10 alkoxy, or C6-C10 aryl; R < 3 > is hydrogen, C1-C10 straight-chain or branched-chain alkyl, C1-C10 alkoxy, or C6-C10 aryl; R4 and R are respectively and independently C1-C10 straight-chain or branched-chain, saturated or unsaturated, substituted or unsubstituted alkyl groups, or C6-C10 aryl; and n is an integer of 1-4. The aminophosphonate compound can be widely applied to extraction of lithium ions in the alkaline solution containing the lithium ions.

Description

technical field

[0001] The invention relates to the technical field of metal ion extraction, in particular to an aminophosphonate compound and its application in extracting lithium from an alkaline solution containing lithium ions. Background technique

[0002] Lithium is the lightest metal in nature and has strong electrochemical activity. Its metals and compounds are widely used in glass, ceramics, aluminum smelting, organic chemical industry, aerospace, nuclear fusion and other industries and fields as thermonuclear fusion (hydrogen bomb) explosives, high-performance propulsion fuels for aircraft, rockets and missiles, and shielding materials for nuclear reactors.

[0003] At present, the effective methods of extracting lithium from salt lake brine include solvent extraction method, and the solvent extraction method inevitably adopts FeCl 3 As a co-extracting agent, the density of the extracted organic phase is increased, the density difference between the two phases is ...

Examples

Embodiment 1

[0109] A method for extracting lithium in an alkaline solution containing lithium ions, the method comprising the steps of:

[0110] 1. Preparation of organic phase: Mix 0.2 mol of extractant with 1.0 L of sulfonated kerosene, and then add sodium hydroxide solution to saponify with a degree of saponification of 30% to obtain an extracted organic phase.

[0111] 2. The original feed solution is the filtrate after lithium precipitation in the salt lake, pH=10.33, and the concentration of each ion is shown in the table

[0112] ion Li Na Mg Ca K g / L 1.85 73.17 0.32 0.039 0.14

[0113] 3. The washing solution is 0.01mol / L hydrochloric acid solution;

[0114] 4. The back extraction agent is 0.5mol / L hydrochloric acid solution;

[0115] 5. Organic phase regeneration solution: 1mol / L sodium carbonate;

[0116] 6. The organic phase and the feed liquid are subjected to 3-stage countercurrent extraction according to the volume ratio of 8:1 to obtain t...

Embodiment 2

[0120] A method for extracting lithium in an alkaline solution containing lithium ions, the method comprising the steps of:

[0121] 1. Preparation of organic phase: Mix 0.2 mol of extractant with 1.0 L of sulfonated kerosene, and then add sodium hydroxide solution to saponify with a degree of saponification of 30% to obtain an extracted organic phase.

[0122] 2. The experimental feed liquid is the tail liquid after extracting cobalt and nickel from waste ternary batteries, and sodium hydroxide solution is added to adjust the pH of the feed liquid to 9.8. The concentration of each ion is shown in the table:

[0123] ion Li Na Ni Co Mg Ca g / L 1.87 32 0.028 0.005 0.002 0.005

[0124] 3. The washing solution is 0.01mol / L hydrochloric acid solution;

[0125] 4. The back extraction agent is 0.5mol / L hydrochloric acid solution;

[0126] 5. Organic phase regeneration solution: 1mol / L sodium carbonate;

[0127] 6. The organic phase and the feed...

Embodiment 3

[0131] A method for extracting lithium in an alkaline solution containing lithium ions, the method comprising the steps of:

[0132] 1. Preparation of organic phase: Mix 0.3 mol of extractant with 1.0 L of sulfonated kerosene, and then add sodium hydroxide solution to saponify with a degree of saponification of 30% to obtain an extracted organic phase.

[0133] 2. The feed solution is a solution for selective leaching of waste lithium iron phosphate power batteries: the concentration of lithium ions is 3.95g / L, the concentration of iron ions is 0.24g / L, and the pH value of the solution is 4.58. Use sodium hydroxide to adjust the acidity and pH of the feed liquid to be greater than 8, and filter.

[0134] 3. The washing solution is 0.01mol / L hydrochloric acid solution;

[0135] 4. The back extraction agent is 0.5mol / L hydrochloric acid solution;

[0136] 5. Organic phase regeneration solution: 1mol / L sodium carbonate;

[0137] 6. The organic phase and the feed liquid are sub...

technical field

[0001] The invention relates to the technical field of metal ion extraction, in particular to an aminophosphonate compound and its application in extracting lithium from an alkaline solution containing lithium ions. Background technique

[0002] Lithium is the lightest metal in nature and has strong electrochemical activity. Its metals and compounds are widely used in glass, ceramics, aluminum smelting, organic chemical industry, aerospace, nuclear fusion and other industries and fields as thermonuclear fusion (hydrogen bomb) explosives, high-performance propulsion fuels for aircraft, rockets and missiles, and shielding materials for nuclear reactors.

[0003] At present, the effective methods of extracting lithium from salt lake brine include solvent extraction method, and the solvent extraction method inevitably adopts FeCl 3 As a co-extracting agent, the density of the extracted organic phase is increased, the density difference between the two phases is ...

Examples

Embodiment 1

[0109] A method for extracting lithium in an alkaline solution containing lithium ions, the method comprising the steps of:

[0110] 1. Preparation of organic phase: Mix 0.2 mol of extractant with 1.0 L of sulfonated kerosene, and then add sodium hydroxide solution to saponify with a degree of saponification of 30% to obtain an extracted organic phase.

[0111] 2. The original feed solution is the filtrate after lithium precipitation in the salt lake, pH=10.33, and the concentration of each ion is shown in the table

[0112] ion Li Na Mg Ca K g / L 1.85 73.17 0.32 0.039 0.14

[0113] 3. The washing solution is 0.01mol / L hydrochloric acid solution;

[0114] 4. The back extraction agent is 0.5mol / L hydrochloric acid solution;

[0115] 5. Organic phase regeneration solution: 1mol / L sodium carbonate;

[0116] 6. The organic phase and the feed liquid are subjected to 3-stage countercurrent extraction according to the volume ratio of 8:1 to obtain t...

Embodiment 2

[0120] A method for extracting lithium in an alkaline solution containing lithium ions, the method comprising the steps of:

[0121] 1. Preparation of organic phase: Mix 0.2 mol of extractant with 1.0 L of sulfonated kerosene, and then add sodium hydroxide solution to saponify with a degree of saponification of 30% to obtain an extracted organic phase.

[0122] 2. The experimental feed liquid is the tail liquid after extracting cobalt and nickel from waste ternary batteries, and sodium hydroxide solution is added to adjust the pH of the feed liquid to 9.8. The concentration of each ion is shown in the table:

[0123] ion Li Na Ni Co Mg Ca g / L 1.87 32 0.028 0.005 0.002 0.005

[0124] 3. The washing solution is 0.01mol / L hydrochloric acid solution;

[0125] 4. The back extraction agent is 0.5mol / L hydrochloric acid solution;

[0126] 5. Organic phase regeneration solution: 1mol / L sodium carbonate;

[0127] 6. The organic phase and the feed...

Embodiment 3

[0131] A method for extracting lithium in an alkaline solution containing lithium ions, the method comprising the steps of:

[0132] 1. Preparation of organic phase: Mix 0.3 mol of extractant with 1.0 L of sulfonated kerosene, and then add sodium hydroxide solution to saponify with a degree of saponification of 30% to obtain an extracted organic phase.

[0133] 2. The feed solution is a solution for selective leaching of waste lithium iron phosphate power batteries: the concentration of lithium ions is 3.95g / L, the concentration of iron ions is 0.24g / L, and the pH value of the solution is 4.58. Use sodium hydroxide to adjust the acidity and pH of the feed liquid to be greater than 8, and filter.

[0134] 3. The washing solution is 0.01mol / L hydrochloric acid solution;

[0135] 4. The back extraction agent is 0.5mol / L hydrochloric acid solution;

[0136] 5. Organic phase regeneration solution: 1mol / L sodium carbonate;

[0137] 6. The organic phase and the feed liquid are sub...

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