Method for recovering lithium resource from lithium-ion-containing solution by using lithium ion carrier

A lithium ion and carrier technology, applied in the field of lithium resource extraction, can solve the problems of complex process, environmental pollution, equipment corrosion, etc., and achieve the effect of reducing recovery cost, high-efficiency lithium resources, and high-efficiency recovery

Active Publication Date: 2015-04-29
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method utilizes a high temperature of up to 1200°C to calcinate lithium-magnesium-containing brine to decompose it into magnesium oxide and recover lithium carbonate at the same time. Although the raw material consumption of this process is less, the existing problem is that the removal of magnesium will make the process tend to Complicated, and the hydrogen chloride gas i

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  • Method for recovering lithium resource from lithium-ion-containing solution by using lithium ion carrier

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Take 100 g LiCoO 2 As a lithium ion carrier in a lithium-rich state, 316L stainless steel was made into a cylindrical shape (diameter 8cm, height 6cm), as an anode, the lithium ion carrier was placed in a straight cylinder, and magnetic stirring was used at the bottom of the reaction vessel to ensure LiCoO 2 The effective contact with the electrode is in a suspended state in the annular base, and the cathode is a foamed nickel cylindrical cathode (5 cm in diameter, 6 cm in height) separated by a separator paper. Both the anode and cathode solutions of the electrolytic cell were filled with the same 0.5mol / L LiCl solution and an external DC power supply was used to conduct electrolysis at a constant current of 1A (current density: 10mA / g) for 16 hours to make LiCoO 2 Lithium ion carrier transformed into a lithium-poor state.

[0036] The lithium ion carrier in the lithium-poor state obtained above is used as a carrier for lithium ion absorption of a salt lake brine solu...

Embodiment 2

[0041] Spinel LiMn after delithiation with pre-acidification 2 O 4 As a lithium ion carrier in a lithium-poor state, pre-acidification refers to adding 10 grams of LiMn to 2 O 4 Stir continuously in 2 liters of 0.2 mol / L HCl solution to make them fully contact, and after 12 hours of reaction, filter, wash and dry to obtain a lithium ion carrier in a lithium-poor state. (for the prior art) it is made into an electrode, and the weight percentages of the four components of the electrode are as follows:

[0042] Lithium ion carrier is spinel LiMn after pre-acidification and delithiation 2 O 4 : 51.3%;

[0043] The conductive material is expanded graphite: 8.8%;

[0044] Carrier material nickel foam: 37.8%;

[0045] Binder PTFE: 2.1%.

[0046] The counter electrode is capacitive carbon mixed in PTFE to make the auxiliary electrode. On the cathode carrier of the electrolytic cell, the above-mentioned electrode sheet containing the carrier of lithium ions in a lithium-poor s...

Embodiment 3

[0048] Commercially available LiCoO 2 It is a carrier of lithium ions in a lithium-rich state, and it is made into an electrode. The weight percentages of the four components of the electrode are as follows:

[0049] Lithium ion carrier is LiCoO 2 : 49.4%;

[0050] The conductive material is expanded graphite: 9.6%;

[0051] Carrier material nickel foam: 38.8%;

[0052] Binder PTFE: 2.2%.

[0053] The recovery process of lithium ions is as follows:

[0054] (1) Put 100 grams of LiCoO 2 The lithium ion carrier electrode prepared according to the above ratio is used as the anode, the counter electrode is the capacitive carbon mixed in PTFE to make the auxiliary electrode, and the reference electrode is the SCE electrode. 0.5 liter of 0.5 mol / L MgSO to be recovered is passed into the cathode chamber 4 and 0.5mol / L Li 2 SO 4 The mixed solution is catholyte. The anode chamber is fed with 1 liter of 1 mol / L Na 2 SO 4 and 0.005mol / L LiOH solution as anolyte.

[0055] in ...

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Abstract

The invention relates to a method for recovering a lithium resource from a lithium-ion-containing solution by using a lithium ion carrier and belongs to the technical field of extraction of lithium sources. The method comprises the following steps: under a reducing condition, absorbing lithium ions from a lithium ion solution to be recovered by a lithium ion carrier in a poor lithium state to obtain the lithium ion carrier in a rich lithium state; and under an oxidizing condition, releasing lithium ions from the lithium ion carrier in the rich lithium state and regenerating the lithium ion carrier in the poor lithium state. Through repeated recycling, the lithium source is continuously recovered by the lithium ion carrier from the lithium ion source. In a lithium ion recovery process, consumption of chemical raw materials is avoided, so that the method meets the requirement of atomic economic reaction and has the advantages of cleanness, efficiency and no discharge of waste liquid. The lithium ion carrier provided by the invention theoretically has an infinite cycle index and the actual cycle life reaches 500-1000 times.

Description

technical field [0001] The invention belongs to the technical field of extracting lithium resources, in particular to a method for extracting lithium resources from a lithium ion-containing solution using a lithium ion carrier, which is suitable for any natural and processed lithium ion-containing solution or lithium-containing waste liquid, and mainly includes Lithium-containing solution obtained from lithium-containing salt lakes and salt fields by concentrating lithium-containing old halogen and processing waste lithium-ion batteries. Background technique [0002] As the metal element with the smallest atomic weight in nature, lithium is widely used in lithium-ion batteries, metal hydrides and nuclear fusion due to its active chemical properties. With the rapid development of lithium-ion batteries, etc., the demand for lithium resources has increased rapidly, and the mining of new lithium-containing minerals and the recovery of waste lithium resources have been promoted. ...

Claims

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Application Information

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IPC IPC(8): H01M10/54H01M4/139
CPCH01M4/139H01M10/54Y02E60/10Y02W30/84
Inventor 潘军青胡岩孙艳芝王洁欣
Owner BEIJING UNIV OF CHEM TECH
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