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Method for extracting lithium from salt lake brine by using adsorption method

A technology of salt lake brine and adsorption method, applied in the field of lithium extraction, can solve the problems of long operation cycle and low utilization efficiency of adsorbents, and achieve the effect of improving product yield

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

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Problems solved by technology

[0005] The purpose of the invention is to solve the problems of low utilization efficiency of adsorbent and long operation period in the process of extracting lithium in salt lake brine by the existing adsorption method

Method used

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  • Method for extracting lithium from salt lake brine by using adsorption method

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Effect test

Embodiment 1

[0034] 100g FeSO 4 The ion sieve adsorbent was added to 50L of salt lake brine, heated and stirred, the temperature of the solution was controlled to be 40°C, and stirred for 60min. + into the adsorbent, at this time Li in the solution + The concentration of FeSO decreased to 1.07g / L, FeSO 4 The adsorption of Li on the ion sieve adsorbent is about 40mg / g, and then it is filtered and concentrated by a ceramic membrane. The average pore size of the ceramic membrane is 5, 20, 50, 200, and 500 nm, the filtration pressure is 0.2 MPa, and the flow rate on the membrane surface is 3 m / s. , the filtration temperature is 50 °C, the recoil interval is 40 min, and the recoil time is 10 s; the clear liquid can enter the magnesium extraction process to recover magnesium, and the ceramic membrane filtration concentrate is subjected to plate and frame pressure filtration to remove most of the impurities and water in the concentrate. The adsorption filter cake that has adsorbed lithium, the ...

Embodiment 2

[0039] 100g FeSO 4 The ion sieve adsorbent was added to 50L of salt lake brine, heated and stirred, the temperature of the solution was controlled to 50°C, and stirred for 50min. + into the adsorbent, at this time Li in the solution + The concentration of FeSO decreased to 1.02g / L, FeSO 4 The adsorption of Li by the ion sieve adsorbent is about 40mg / g, and then it is filtered and concentrated by a ceramic membrane. The average pore size of the ceramic membrane is 200nm, the filtration pressure is 0.4MPa, and the membrane surface flow rate is 0.5m / s, 1m / s, 2m respectively. / s, 3m / s, 4m / s, 5m / s, the filtration temperature is 60°C, the recoil interval is 40min, and the recoil time is 30s; the supernatant can enter the magnesium extraction process to recover magnesium, and the ceramic membrane filtration concentrate is pressed by the plate and frame Filtration to remove most of the impurities and water in the concentrated solution to obtain an adsorption filter cake that has ads...

Embodiment 3

[0044] 100g FeSO 4 The ion sieve adsorbent was added to 50L of salt lake brine, heated and stirred, the temperature of the solution was controlled to 50°C, and stirred for 50min. + into the adsorbent, at this time Li in the solution + The concentration of FeSO decreased to 1.02g / L, FeSO 4 The adsorption of Li by the ion sieve adsorbent is about 40mg / g, and then it is filtered and concentrated by a ceramic membrane. The average pore size of the ceramic membrane is 200nm, the filtration pressure is 0.4MPa, the dead-end filtration mode is adopted, the filtration temperature is 60℃, and the backwash interval is 40min. , the recoil time is 30s, and the concentration ratio is about 30 times; the clear liquid can enter the magnesium extraction process to recover magnesium, and the ceramic membrane filtration concentrated liquid is subjected to plate and frame pressure filtration to remove most of the impurities and water in the concentrated liquid. Adsorption filter cake, the filtr...

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Abstract

The invention discloses a method for extracting lithium from salt lake brine by using an adsorption method. The method comprises the following steps of adding an absorbent in the brine; absorbing the lithium ions in the brine to the absorbent; then treating by using a ceramic membrane; retaining the absorbent in a concentrated solution; subjecting the concentrated solution to plate-frame pressure filtration to obtain an absorbent filter cake; removing most of impurities and water from the brine; washing the filter cake with water and desorbing with an eluent to obtain a desorption solution; removing magnesium from the desorption solution by passing the desorption solution through a weak acid type cation exchange resin; concentrating with a reverse osmosis membrane to obtain a refined lithium solution for preparing lithium carbonate. The method is simple in process and can be operated easily. The absorbent has high utilization efficiency; a lithium-extracting process is short; and the content of the prepared lithium solution is high.

Description

technical field [0001] The invention relates to a method for extracting lithium from salt lake brine by an adsorption method, in particular to a method for extracting lithium from salt lake brine with high magnesium-to-lithium ratio and concentrated lithium-containing old brine in salt fields. Background technique [0002] Lithium is one of the important rare metals closely related to the national economy and people's lives. Its metals and compounds are widely used in glass, ceramics, chemical industry and other fields, especially since the beginning of the 21st century, metal lithium and its compounds have been used in high-energy batteries, aerospace, nuclear Fusion power generation and ultra-light and high-strength lithium alloys have been widely used, resulting in increasing demand for lithium, which has become an irreplaceable energy metal in the 21st century. The world's lithium resources are mainly distributed in pegmatite deposits and brine deposits, of which salt la...

Claims

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Application Information

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IPC IPC(8): C22B26/12C22B3/24C22B3/22
CPCY02P10/20
Inventor 彭文博曹恒霞王肖虎熊福军项娟张宏
Owner JIANGSU JIUWU HITECH
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