A method for recovering lithium resources from lithium-ion-containing solutions using lithium ion carriers

A lithium ion and lithium recovery technology, applied in the field of lithium resource extraction, can solve problems such as environmental pollution, complicated process, equipment corrosion, etc., and achieve the effect of reducing recycling costs, simple process and efficient recycling

Active Publication Date: 2017-05-10
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 in the production process corrodes the equipment seriously, and the energy consumption is high
We observed that this method requires secondary treatment with hydrochloric acid before and after elution, which not only produces serious equipment corrosion, waste acid solution, but also the chlorine gas generated during the treatment process is likely to cause environmental pollution

Method used

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  • A method for recovering lithium resources from lithium-ion-containing solutions using lithium ion carriers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] With 100 g LiCoO 2 As a lithium ion carrier in a lithium-rich state, 316L stainless steel is made into a cylindrical shape (diameter 8cm, height 6cm). As an anode, the lithium ion carrier is placed in a straight cylinder and stirred with magnetic force at the bottom of the reaction vessel to ensure that LiCoO 2 The effective contact with the electrodes is in a suspended state in the ring-shaped base, and the cathode is a nickel foam cylindrical cathode (diameter 5cm, height 6cm) separated by diaphragm paper. The anode and cathode solutions of the electrolytic cell are filled with the same 0.5mol / L LiCl solution, connected to an external DC power supply, and electrolyzed at a constant current of 1A (current density: 10mA / g) for 16 hours to make LiCoO 2 Lithium ion carriers transformed into a lithium-poor state.

[0036] The lithium ion carrier obtained in the lithium-poor state above is used as a carrier for absorbing lithium ions in the salt lake brine solution. At th...

Embodiment 2

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

[0042] The 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 a capacitive carbon mixed in PTFE to make an auxiliary electrode. Place the above-mentioned electrode sheet containing the carrier of lithium ions in a lithium-deficient state on the cathode carrier of the electrolyzer,...

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] The 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) 100 g of LiCoO 2 The lithium ion carrier electrode made according to the above ratio is used as an anode, the counter electrode is a capacitor carbon mixed in PTFE to make an auxiliary electrode, and the reference electrode is an SCE electrode. The cathode chamber is fed with 0.5 liter of 0.5mol / LMgSO to be recovered 4 and 0.5mol / L Li 2 SO 4 The mixed solution is catholyte. The anode chamber is fed with 1 liter of 1mol / L Na 2 SO 4 And 0.005mol / LLiOH solution is the anolyte.

[0055] In relative to LiCoO...

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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, specifically a method for extracting lithium resources from lithium ion-containing solutions using lithium ion carriers, suitable for any natural and processed lithium ion-containing solutions or lithium-containing waste liquids, mainly including Lithium-containing salt lakes and salt fields are concentrated lithium-containing old brines and lithium-containing solutions obtained from the treatment of waste lithium-ion batteries. Background technique [0002] As the metal element with the smallest atomic weight in nature, lithium is widely used in the fields of lithium-ion batteries, metal hydrides and nuclear fusion due to its relatively active chemical properties. With the rapid development of lithium-ion batteries, 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 p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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