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Method for selectively extracting and recovering aluminum from sulfate solution containing lithium, sodium, potassium and aluminum

A lithium sodium potassium aluminum and sulfate technology, applied in aluminum sulfate, lithium carbonate;/acid carbonate, alkali metal sulfite/sulfite, etc., can solve environmental pollution, ammonia nitrogen treatment difficulties, etc. problems, achieve high economic and environmental benefits, high stripping rate, and easy stripping and regeneration

Active Publication Date: 2021-11-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the cost of using concentrated ammonia water as a saponification agent is relatively low, it will cause difficulties in the treatment of ammonia nitrogen in wastewater and cause environmental pollution.

Method used

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  • Method for selectively extracting and recovering aluminum from sulfate solution containing lithium, sodium, potassium and aluminum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037]Mix bis(4-tert-octylphenyl) phosphate, n-butanol and sulfonated kerosene at a volume ratio of 40:10:50 to obtain an extracted organic phase. The lithium sodium potassium aluminum sulfate solution that preparation pH value is 4.5, wherein, the concentration of aluminum ion is 12.5g / L, and the concentration of lithium ion is 3.6g / L, and the concentration of sodium ion is 18g / L, and the concentration of potassium ion is 12g / L.

[0038] The extracted organic phase and lithium sodium potassium aluminum sulfate solution were mixed uniformly according to the volume ratio of 3:1, and subjected to three-stage countercurrent extraction at 40°C for 8 minutes, and then clarified and separated to obtain the loaded organic phase and lithium sodium potassium sulfate solution. saline solution. Use an equal volume of water at 40°C to carry out one-stage countercurrent washing on the loaded organic phase, clarify the layers, and mix the water washing solution and the raffinate.

[0039]...

Embodiment 2

[0043] Mix the extractant, n-butanol and sulfonated kerosene with a volume ratio of 40:10:50 to obtain the extracted organic phase. The extractant contains (4-tert-octylphenyl) phosphate and diphosphate with a mass ratio of 15:85 (4-tert-octylphenyl) ester. The lithium sodium potassium aluminum sulfate solution that preparation pH value is 2, wherein, the concentration of aluminum ion is 9.36g / L, and the concentration of lithium ion is 2.46g / L, and the concentration of sodium ion is 15g / L, and the concentration of potassium ion is 12.5g / L.

[0044] The extracted organic phase and lithium sodium potassium aluminum sulfate solution were mixed uniformly according to the volume ratio of 1:1, and subjected to 5-stage countercurrent extraction at 30°C for 10 minutes, and then clarified and separated to obtain the loaded organic phase and lithium sodium potassium sulfate solution. saline solution. The loaded organic phase with a volume ratio of 5:1 was mixed with water, and the loa...

Embodiment 3

[0048] Mix the extractant, isobutanol and sulfonated kerosene with a volume ratio of 30:5:65 to obtain the extracted organic phase. The extractant contains (dodecylphenyl) phosphate and di(dodecylphenyl) phosphate in a mass ratio of 10:90 dodecylphenyl) ester. Prepare a lithium sodium potassium aluminum sulfate solution with a pH value of 3, wherein the concentration of aluminum ions is 6.13g / L, the concentration of lithium ions is 1.95g / L, the concentration of sodium ions is 8.53g / L, and the concentration of potassium ions It is 6.21g / L.

[0049] The extracted organic phase and lithium sodium potassium aluminum sulfate solution were mixed uniformly according to the volume ratio of 1:1, and subjected to 4-stage countercurrent extraction at 25°C for 12 minutes, and then clarified and separated to obtain the loaded organic phase and lithium sodium potassium sulfate solution. saline solution. The loaded organic phase with a volume ratio of 2:1 was mixed with water, and the load...

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Abstract

The invention belongs to the technical field of ion extraction, and provides a method for selectively extracting and recovering aluminum from a sulfate solution containing lithium, sodium, potassium and aluminum, the method comprises the following steps: mixing the sulfate solution containing lithium, sodium, potassium and aluminum with an extraction organic phase, extracting and layering to obtain a loaded organic phase and a lithium-sodium-potassium sulfate solution; mixing the loaded organic phase with the strip liquor, and carrying out reverse extraction and layering to obtain an organic phase and an aluminum sulfate solution; sequentially performing evaporation, concentration and cooling crystallizationthe on the aluminum sulfate solution and obtaining Al2 (SO4) 3.18 H2O. According to the method, efficient selective separation of aluminum ions and lithium, sodium and potassium ions can be realized in a relatively wide pH value range, the extraction rate and the reverse extraction rate of the aluminum ions are very high, and high-purity Al2 (SO4) 3.18 H2O is obtained; the extraction organic phase is easy to reextract and regenerate, the extraction agent does not need saponification treatment, and the method has high economic benefits and environmental benefits.

Description

technical field [0001] The invention relates to the technical field of ion extraction, in particular to a method for selectively extracting and recovering aluminum from lithium-containing sodium potassium aluminum sulfate solution. Background technique [0002] Solvent extraction is an efficient technology for extracting and separating aluminum from lithium-containing sodium potassium aluminum sulfate solution. It has the advantages of simple process and equipment, continuous operation, and easy automatic control. [0003] During the extraction process, acidic phosphorus (phosphine) extractants mainly undergo cation exchange reactions between metal elements and hydrogen ions in the extractant, resulting in the continuous enrichment of hydrogen ions in the aqueous solution, which affects the equilibrium acidity of the water phase. During the extraction reaction, the metal extraction distribution ratio is greatly affected by the acidity of the aqueous phase. The hydrogen ions...

Claims

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Application Information

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IPC IPC(8): C01F7/74C22B3/38C22B21/00C01D15/08C01D5/00
CPCC01F7/74C22B21/0015C01D15/08C01D5/00C01P2006/80Y02P10/20
Inventor 杨声海李帅赖延清陈永明金胜明田忠良莫才宣
Owner CENT SOUTH UNIV
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