A method for extracting lithium from lithium-containing wastewater

A technology for extracting lithium and waste water, applied in the field of lithium extraction, to achieve the effects of reducing human injury, equipment corrosion, and strong alkali consumption

Active Publication Date: 2020-01-14
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are basically no reports on the next step of removing calcium, magnesium, aluminum and iron under near-neutral conditions. Most of them report the method of extracting lithium from salt lake brine to prepare lithium carbonate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The present embodiment provides a method for extracting lithium from lithium-containing wastewater, the method comprising the following steps:

[0044] (1) Add sodium hydroxide and phosphoric acid to the lithium-containing wastewater to adjust the pH to 7.5, add sodium phosphate, stir at a rate of 500r / min, react at 45°C for 360min, and then filter to obtain a lithium-containing enrichment solution;

[0045] (2) Add potassium phosphate to the lithium-containing enrichment solution obtained in step (1), filter after the reaction at 60°C for 60 minutes, wash the obtained solid three times with ultrapure water, and dry it at 80°C for 24 hours to obtain Li 3 PO 4 .

[0046] The lithium-containing waste water that the present invention uses contains Li + , Mg 2+ and SO4 2- and other ions, the pH is 3.69, where Li + The concentration is 4.62g / L, Mg 2+ The concentrations were 1g / L.

[0047] Li prepared in this example 3 PO 4 The purity is 99.90%, and the recovery rate...

Embodiment 2

[0049] The present embodiment provides a method for extracting lithium from lithium-containing wastewater, the method comprising the following steps:

[0050] (1) Add sodium hydroxide and phosphoric acid to the lithium-containing wastewater to adjust the pH to 8.5, add potassium phosphate and ammonium phosphate, stir at a rate of 450r / min, react at 40°C for 360min, and filter to obtain a lithium-containing enrichment solution;

[0051] (2) Add potassium phosphate and dipotassium hydrogen phosphate to the lithium-containing enrichment solution obtained in step (1), filter after the reaction at 20°C for 120min, wash the obtained solid three times with ultrapure water, and dry at 120°C Dry for 8 hours to get Li 3 PO 4 .

[0052] The lithium-containing waste water that the present invention uses contains Li + , Mg 2+ 、Al 3 and Cl - and other ions, the pH is 1.62, where Li + The concentration is 8.35g / L, Mg 2+ and Al 3+ The concentrations are 0.5g / L and 1.2g / L respectively...

Embodiment 3

[0055] The present embodiment provides a method for extracting lithium from lithium-containing wastewater, the method comprising the following steps:

[0056] (1) Add sodium hydroxide and phosphoric acid to the lithium-containing wastewater to adjust the pH to 8.1, add sodium phosphate and ammonium phosphate, stir at a rate of 400r / min, react at 25°C for 160min, and then filter to obtain a lithium-containing enrichment solution;

[0057] (2) Add sodium phosphate to the lithium-containing enrichment solution obtained in step (1), filter after the reaction at 50°C for 90 minutes, wash the obtained solid three times with ultrapure water, and dry it at 100°C for 15 hours to obtain Li 3 PO 4 .

[0058] The lithium-containing waste water that the present invention uses contains Li + , Ca 2+ , Mg 2+ 、Na + and CH 3 COO - and other ions, the pH is 3.14, where Li + The concentration is 3.68g / L, Ca 2+ , Mg 2+ , and Na + The concentrations were 1.2g / L, 0.9g / L and 3g / L, respecti...

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PUM

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Abstract

The invention provides a method of extracting lithium from lithium-containing wastewater. The method comprises the following steps of: adding a first precipitating agent and a PH conditioning agent tothe lithium-containing wastewater so as to adjust the pH to be 5-12, and carrying out solid-liquid separation after ending reaction to obtain lithium-containing enrichment liquid; and adding a secondprecipitating agent to the obtained lithium-containing enrichment liquid, carrying out solid-liquid separation after ending reaction to obtain Li3PO4. The method has the beneficial effects that phosphate is used as an impurity remover; calcium, magnesium, aluminum and iron are removed in one step under a near-neutral condition; the synergistic removal of the calcium, magnesium, aluminum and ironcan be realized; the one-step filtration is realized; the loss rate of lithium is reduced; the consumption of strong base in an impurity removal process is reduced; the equipment corrosion and production cost are reduced; the harm to human bodies is reduced; and the realization of industrialization is easy.

Description

technical field [0001] The invention belongs to the field of wastewater treatment and relates to a method for extracting lithium from lithium-containing wastewater. Background technique [0002] With the increasing application of lithium-ion batteries in various fields and the rise of the new energy electric vehicle industry, the demand for lithium iron phosphate continues to rise, resulting in Li 3 PO 4 With the increasing demand, whether it is the lithium-containing wastewater produced in the lithium salt production process or the leaching solution obtained by leaching waste lithium ions, it contains a large amount of secondary lithium resources. With the depletion of primary lithium resources and the increasing emphasis on environmental protection in various countries, the recovery of secondary lithium resources has become a key issue at present, which can not only alleviate the problem of resource shortage but also prevent secondary pollution to the environment. At pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B26/12
CPCC22B7/006C22B26/12Y02P10/20
Inventor 孙峙赵春龙曹宏斌
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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