Process and device for extracting battery grade lithium from brine

A battery-grade, brine technology, applied in lithium carbonate;/acid carbonate and other directions, can solve the problems of large amount of reagents, long time consumption, low yield, etc., to improve product yield and product quality, The effect of increasing the concentration ratio

Active Publication Date: 2015-01-28
JIANGSU JIUWU HITECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is: improve the time-consuming in the process of extracting lithium from brine, the concentration factor of lithium chloride is not high, the yield is low, the amount of reagent used is large, and the problems of high impurity content in lithium carbonate products are proposed. A process and device for extracting battery-grade lithium from brine

Method used

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  • Process and device for extracting battery grade lithium from brine
  • Process and device for extracting battery grade lithium from brine
  • Process and device for extracting battery grade lithium from brine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0111] 100gFeSO 4 The ion sieve lithium adsorbent was loaded into the packed column, and the salt lake brine was sent into the adsorbent bed at a rate of 3 BV / h. After 2 hours, the adsorption saturation was reached, and Li +The concentration of lithium is no longer reduced; use phosphoric acid solution for desorption, the pH of the phosphoric acid solution is controlled at about 1, the flow rate of the desorbent is 2 BV / h, and the desorption is completed after about 3 hours, and the lithium desorption solution is then removed by weak acid cation exchange resin D113 For a small amount of magnesium in the desorption solution, the flow rate of the desorption solution is controlled at 5 BV / h, and then the concentration of lithium ions in the treated desorption solution is concentrated to about 20g / L with a reverse osmosis membrane, and the concentration temperature of the reverse osmosis is controlled at 30°C. The operating pressure is 0.15Mpa, that is, lithium ions can be convert...

Embodiment 2

[0114] The difference from Example 1 is that the process of adsorption and desorption is to mix the adsorbent in brine, and then dehydrate the adsorbent through ceramic membrane filtration and plate-and-frame filtration before desorption. The specific steps are:

[0115] 100gFeSO 4 The ionic sieve adsorbent was added to 50L salt lake brine, heated and stirred, the temperature of the solution was controlled at 40°C, and stirred for 60 minutes, the Li in the brine + into the adsorbent, at this time the Li in the solution + The concentration is reduced to 1.07g / L, FeSO 4 The ion sieve adsorbent has an adsorption capacity of about 40 mg / g of Li, and then uses a ceramic membrane to concentrate and filter the mixed material liquid. The average pore size of the ceramic membrane is 5, 20, 50, 200, and 500 nm, and the filtration pressure is 0.2 MPa. The membrane surface flow rate is 3 m / s, the filtration temperature is 50°C, the backflush interval is 40min, and the backflush time is...

Embodiment 3

[0121] The difference from Example 2 is that after the desorption solution is obtained, magnesium and calcium ions are removed through a primary nanofiltration membrane. The specific steps are:

[0122] 100gFeSO 4 The ionic sieve adsorbent was added to 50L salt lake brine, heated and stirred, the temperature of the solution was controlled at 40°C, and stirred for 60 minutes, the Li in the brine + into the adsorbent, at this time the Li in the solution + The concentration is reduced to 1.07g / L, FeSO 4 The ion sieve adsorbent has an adsorption capacity of about 40 mg / g of Li, and then uses a ceramic membrane to concentrate and filter the mixed material liquid. The temperature is 50°C, the backflush interval is 40min, and the backflush time is 10s; the ceramic membrane filter concentrate is filtered through plate and frame to remove most of the impurities and water in the concentrate, and the adsorbent filter cake that has adsorbed lithium is obtained, and the press filter Th...

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Abstract

The invention relates to a process and a device for extracting battery grade lithium from brine. The process comprises the following steps: adding an adsorbent into the brine to adsorb lithium ions in the brine, intercepting the adsorbent by using a ceramic membrane filter, performing plate-frame pressure filtration on the ceramic membrane concentrated solution to obtain an adsorbent filter cake, washing and desorbing the adsorbent filter cake so as to obtain a desorption solution; removing magnesium in the desorption solution through a nanofiltration membrane system, entering the nanofiltration membrane permeate into an ion exchange resin tower for performing deep magnesium removal, concentrating through a reverse osmosis membrane, performing deep concentration in a DTRO membrane or electrodialysis equipment, evaporating the concentrated solution, adding BaCl2, Na2CO3 and NaOH into the solution, stirring, filtering in a ceramic membrane filter, performing plate-frame pressure filtration on the ceramic membrane filtrate, adding Na2CO3 into the clear liquid, preparing Li2CO3, washing Li2CO3 through a ceramic membrane, centrifuging, and drying, thereby obtaining the finished battery grade Li2CO3 product.

Description

[0001] technical field [0002] The invention relates to a process and a device for extracting battery-grade lithium from brine, in particular to a method and a device for extracting high-purity lithium in brine by using membrane technology, and belongs to the technical field of membrane separation. [0003] Background technique [0004] Lithium is one of the important rare metals that are closely related to the national economy and people's lives. It has been widely used in traditional fields such as glass ceramics, petrochemicals, metallurgy, textiles, synthetic rubber, lubricating materials, and medical treatment. Lithium carbonate is a basic compound in the lithium chemical industry, which has many uses and can be widely used in medicine, batteries and other fields. [0005] Lithium resources are relatively abundant in the world, mainly distributed in South and North America, Asia, Australia and Africa. The lithium minerals that are mined and used most in the world to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08
Inventor 彭文博王肖虎熊福军张桂花曹恒霞项娟张宏
Owner JIANGSU JIUWU HITECH
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