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Continuous ion exchange device and method capable of realizing lithium-sodium separation

A continuous ion exchange device technology, which is applied in the field of continuous ion exchange devices and continuous ion exchange devices for the separation of lithium and sodium, can solve the problems of low recovery rate and incomplete separation of lithium and sodium, so as to reduce production costs and improve use efficiency and utilization rate, the effect of saving consumption

Active Publication Date: 2018-11-27
SUNRESIN NEW METERIALS CO LTD XIAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages: 1. Lithium and sodium cannot be completely separated, and post-processing is required; 2. The recovery rate is low, and the recovery rate is only 50%

Method used

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  • Continuous ion exchange device and method capable of realizing lithium-sodium separation
  • Continuous ion exchange device and method capable of realizing lithium-sodium separation
  • Continuous ion exchange device and method capable of realizing lithium-sodium separation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0068] As shown in Table 1, the continuous ion exchange extraction process that can realize the separation of lithium and sodium in the present invention adopts continuous ion exchange equipment to separate lithium chloride from a solution containing lithium and sodium, and adopts a series continuous operation mode. (Numbers represent different resin columns)

[0069] Table 1: Functional step-by-step operation table of different regions of the resin column

[0070]

[0071]

[0072] The method described in this embodiment includes the following steps:

[0073] The resin of the resin column adopts the special resin for separating lithium and sodium (Xi'an Lanxiao Technology New Material Co., Ltd.), and the lithium ion content in the feed liquid is 1.7g / L.

[0074] As shown in Table 1, each resin column is in the following different resin column groups, taking step number (1) as an example:

[0075] 1#, 2# column: desorption group 3# column: eluting group

[0076] 4#, 5...

Embodiment 2-11

[0085] The difference with embodiment 1 is:

[0086] Carry out the comparison experiments of different rates of lithium-sodium separation group and different flow rates of elution group:

[0087] The resin is a special resin for lithium and sodium separation of Xi'an Lanxiao Technology

[0088]

[0089] (Eluting flow rate: 2BV / h, operating flow rate is 2BV / h)

Embodiment 12-15

[0091] The difference with embodiment 1 is:

[0092] Carry out comparative experiments under different rate conditions of the desorption group:

[0093] The resin of the resin column adopts Xi'an Lanxiao lithium-sodium separation special resin

[0094]

[0095]

[0096] (Desorption rate: 2BV / h, use 4% hydrochloric acid solution as the desorption solution)

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Abstract

The invention relates to a continuous ion exchange device and method capable of realizing lithium-sodium separation. The device comprises resin, a plurality of resin columns, a feeding total pipe anda discharging total pipe, wherein the resin columns are used for loading resin, the feeding total pipe is communicated with the upper ends of the resin columns, the discharging total pipe is communicated with the lower ends of the resin columns, the resin columns are sequentially connected in series through a pipeline so as to form an adsorption lithium ion group, a drip washing group, a desorption group, a back-flushing group and a material top water group which are capable of sequentially moving and circulating; and control valves are respectively arranged on each feeding branched pipe and each discharging branched pipe and are used for coordinately controlling each resin column group so as to realize ion exchange, drip washing and desorption. Compared with an existing fixed-bed ion exchange technique, the device has the advantages that the equipment is simple, the operation is convenient, the automation level is high, the use amount of resin is low, the utilization rate is high, theproduct concentration is stable, and the concentration of a qualified solution is high.

Description

technical field [0001] The invention relates to a continuous ion exchange device, in particular to a continuous ion exchange device for separating lithium and sodium, and also relates to a continuous ion exchange method for separating lithium and sodium using the device. Background technique [0002] In lithium carbonate production technology, whether it is salt lake lithium extraction technology or ore lithium extraction technology, it is necessary to use sodium carbonate for lithium carbonate precipitation in the end. The supernatant after precipitation contains about 2g / L of lithium ions and 40g / L of sodium ions. If it needs to be processed into lithium carbonate, hot water is also needed to wash the lithium carbonate. The concentration of lithium ions in the washing water is about 2g / L, and the concentration of sodium ions is 5g / L. The loss of the above two parts accounts for about 10% to 40% in the production process of lithium carbonate. Therefore, in the production p...

Claims

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Application Information

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IPC IPC(8): C22B3/42C22B26/12C22B26/10
CPCC22B3/42C22B26/10C22B26/12Y02P10/20
Inventor 李岁党寇晓康余佳
Owner SUNRESIN NEW METERIALS CO LTD XIAN
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