Assembly line system in which service life of lithium ion sieve adsorbents is prolonged and operating method thereof

An operation method and adsorbent technology, applied in separation methods, chemical instruments and methods, filtration separation, etc., can solve problems such as slow dissolution and immature recycling technology of waste lithium batteries, so as to prolong service life, reduce chemical dissolution, reduce The effect of cost of use

Inactive Publication Date: 2016-01-20
SHANGHAI INST OF SPACE POWER SOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The third is to develop technology for recovering lithium elements from waste lithium batteries. The existing waste lithium battery recovery technology is immature, and the main purpose is to recover cobalt elements in lithium cobalt oxide batteries. Recycling technology is still under study
Among them, the manganese-based lithium-ion sieve adsorbent, such as LiMnO, has been studied most deeply and has the best selective adsorption capacity. 2.5 (usually also denoted as Li 1.6 mn 1.6 o 4 ), Li 4 mn 5 o 12 (usually also denoted as Li 1.33 mn 1.67 o 4 ), etc., but they have a common weakness, that is, they will slowly dissolve during the adsorption-desorption cycle

Method used

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  • Assembly line system in which service life of lithium ion sieve adsorbents is prolonged and operating method thereof
  • Assembly line system in which service life of lithium ion sieve adsorbents is prolonged and operating method thereof
  • Assembly line system in which service life of lithium ion sieve adsorbents is prolonged and operating method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Set 5 adsorption towers as a group, numbered A, B, C, D, E, and the main component of them is LiMnO 2.5 (Li 1.6 mn 1.6 o 4 ) lithium ion sieve adsorbent particles, pay attention to reserve about 1 / 10 of the buffer space at the top of the tower and keep it open to the atmosphere. Slowly pump in 0.25mol / L dilute sulfuric acid, and the effluent contains desorbed lithium, which is sent to the subsequent process for preparing lithium carbonate for use. HMnO in the desorbed state was obtained after acid washing and sufficient ion exchange treatment 2.5 , into the water to wash quickly for 10 to 15 minutes.

[0046] In the pretreatment pool, adjust the pH of the lithium-containing salt lake brine to be adsorbed to 7~8 with carbonate or NaOH, and then add a certain amount of NaHCO according to the lithium content 3 ——For example, this example uses a solution containing lithium 700ppm, then add NaHCO 3 so that the final concentration [HCO 3 - ]=0.075mol / L; Because the pr...

Embodiment 2

[0054] Carry out with reference to the step of embodiment 1, but only in the pretreatment tank, the lithium-containing brine to be adsorbed is treated with Ca(OH) 2 or NaOH to adjust the pH to about 8.5 without adding NaHCO 3 Carbonate and bicarbonate buffers. This method is suitable for production conditions where cheap carbonate (bi)carbonate cannot be obtained. Since there is no buffer, the adsorption rate drops rapidly at the beginning, so it is necessary to replenish alkali before each tower and reuse the liquid to be adsorbed until the lithium content in it is reduced to A certain value.

[0055] In this example, the initial brine to be adsorbed containing 700ppm of lithium is slowly pumped into the adsorption tower groups A, B, C, and D after pretreatment, and the lithium concentration in the effluent of D tower is monitored. When the value rises rapidly to >300ppm, the effluent Drain back to the pretreatment tank, while using the automatic adjustment device to supple...

Embodiment 3

[0059] Carry out with reference to the step of embodiment 1, but adsorbent is changed into Li 1.33 mn 1.67 o 4 -PVC particles, the adsorbent also has the characteristic of increasing the dissolution loss with the extension of time in the near adsorption saturation state. Therefore, this method can also achieve the same total amount of lithium element adsorption-desorption transfer, and the adsorption-desorption steps can be reduced by about 40%. In Example 1, the lithium ion adsorption saturation capacity of the adsorbent is relatively low, so it approaches adsorption saturation quickly, and the degree of dissolution reduction is not as obvious as in Example 1.

[0060] The present invention aims at the common weakness of various lithium ion sieve adsorbents, that is, in actual use, there is a characteristic that the dissolution loss increases with the prolongation of the adsorption time or desorption time, and adopts a strategy: multiple adsorption towers are cascaded to fo...

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Abstract

The invention discloses an assembly line system in which the service life of lithium ion sieve adsorbents is prolonged and an operating method. The system is an adsorption-desorption assembly line composed of a plurality of adsorption towers connected in series and communicated end to end. Each adsorption tower comprises the lithium ion sieve adsorbents with which the adsorption tower is filled, a pump arranged at an inlet of the adsorption tower, a first valve for controlling the inlet of the adsorption tower and a second valve for controlling an outlet of the adsorption tower. According to the assembly line system, the working state of the lithium ion sieve adsorbents is switched in time in an assembly line rotating mode according to the adsorption saturation degree of the lithium ion sieve adsorbents, the service life of the adsorbents can be prolonged on the premise that the microstructures of the adsorbents are not improved, the adsorption and transferring quantity of lithium elements in the whole life cycle is increased, production cost is reduced, and the efficiency-cost ratio is increased. By means of the assembly line system and the operating method, the lithium ion sieve adsorbents and the adsorption-desorption technology thereof can be easily applied to the occasions in which the concentration of the lithium elements is low, and the resource use rate in the lithium mineral resource exploiting process and the waste lithium battery recycling process is increased.

Description

technical field [0001] The invention belongs to the fields of mining of mineral resources and recycling of solid waste, and relates to a method for using a lithium ion sieve adsorbent on a lithium resource mining or recovery production line, specifically, to a method for improving the lithium ion sieve by rotating and switching the state of the assembly line. The method of adsorbent lifetime. Background technique [0002] With the advent of the digital information era and the new energy era, lithium secondary batteries have become the most comprehensive performance and the most widely used portable and mobile energy storage devices, especially in recent years for electric vehicles, hybrid vehicles and energy storage power stations. The demand for large-scale energy storage applications has exploded, and the output of lithium secondary batteries has doubled. Batteries have become the main consumption direction of lithium resources. The strategic significance of lithium resou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/04B01J20/34
Inventor 马瑞汤卫平吴勇民徐碇皓
Owner SHANGHAI INST OF SPACE POWER SOURCES
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