Method for extracting lithium from brine to prepare battery-grade lithium carbonate by ion exchange method

A battery-grade lithium carbonate technology, applied in lithium carbonate;/acid carbonate, chemical instruments and methods, hydrotalcite, etc., can solve problems such as difficult filtration, reduced lithium recovery rate, easy mother liquor entrainment, etc. Achieve excellent thermal stability and flame retardant properties, improve filtration performance, and reduce the effect of mother liquor entrainment

Active Publication Date: 2017-05-10
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This technology allows for efficient removal or separation of magnetic metals from other materials like calcium oxides during production processes without causing damage. By combining this process with an ion exchange resin (IER) material called activated charcoal), it becomes possible to recover high quality lithiating chemical compounds made up mostly of cations and divancies. Additionally, when combined with another step involving selective precipitator media, these new products have improved properties such as better heat resistance compared to traditional methods. Overall, this technology helps create highly pure batteries at industrial scale while improving their overall effectiveness over existing technologies.

Problems solved by technology

This patented technology describes two main issues related to current methods used during lithiated redox flow cells (LiB). One problem addressed by this patent relates to the presence of excessive amounts of iron or calcium in these solutions that may affect their performance negatively. Another issue involves removing too much magnetic metal ions present in the system without compromising its ability to separate them efficiently.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0027] Take by weighing 256g and extract potassium back old brine (Mg + Quality is 16.79g), add 83g aluminum chloride hexahydrate, stir and dissolve, this is solution A; Take by weighing 82.9g sodium hydroxide, 21.9g sodium carbonate, add 400g water to dissolve, this is solution B; Solution A, B At the same time, drop it into the three-necked flask, the dropping rate is controlled at 1mL / min, the pH of the control system is 11, and the temperature is 35°C; after the dropwise addition, stir for 1 hour, heat up to 80°C, age for 24 hours, and then filter to obtain lithium-rich mother liquor C, the lithium ion content is 1500mg / L, and the magnesium ion content is 0.42mg / L.

[0028] Put the granular manganese-based adsorbent into the glass column, and carry out dynamic adsorption of the above lithium-rich solution C in a countercurrent manner through a peristaltic pump. After the adsorption is saturated, the experiment is stopped, and the adsorption column is washed with water unti...

Embodiment 2

[0031] Take by weighing 300g old bittern (Mg + Quality is 19.5g), add 19.5g aluminum chloride hexahydrate, stir and dissolve, this is solution A; Take by weighing 39g sodium hydroxide, 5.85g sodium carbonate, add 400g water to dissolve, this is solution B; Solution A, B At the same time, add it dropwise into a three-necked flask, the dropping rate is controlled at 0.5mL / min, the pH of the control system is 8, and the temperature is 30°C; after the dropwise addition, stir and react for 1 hour, heat up to 80°C, age for 24 hours and filter to obtain lithium-rich Mother liquor C has a lithium ion content of 1370 mg / L and a magnesium ion content of 25 mg / L.

[0032] Put the granular manganese-based adsorbent into the glass column, and carry out dynamic adsorption of the above lithium-rich solution C in a countercurrent manner through a peristaltic pump. After the adsorption is saturated, the experiment is stopped, and the adsorption column is washed with water until the washing sol...

Embodiment 3

[0035] Take by weighing 280g and extract potassium back old brine (Mg +Quality is 25.2g), add 126g aluminum chloride hexahydrate, stir and dissolve, this is solution A; Take by weighing 151.5g sodium hydroxide, 75.6g sodium carbonate, add 500g water to dissolve, this is solution B; Solution A, B At the same time, drop it into the three-necked flask, the dropping rate is controlled at 5mL / min, the pH of the control system is 12, and the temperature is 50°C; after the dropwise addition, stir and react for 1 hour, heat up to 80°C, age for 24 hours, and then filter to obtain lithium-rich mother liquor C, the lithium ion content is 1441mg / L, and the magnesium ion content is 15.4mg / L.

[0036] Put the granular manganese-based adsorbent into the glass column, and use the peristaltic pump to dynamically adsorb the above lithium-rich solution C in a countercurrent manner. After the adsorption is saturated, stop the experiment, wash the adsorption column with water until the washing sol...

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Abstract

The invention relates to the field of lithium carbonate preparation, in particular to a method for extracting lithium from brine to prepare battery-grade lithium carbonate by an ion exchange method. The method includes the steps of 1), removing magnesium by a coprecipitation method; 2), adsorbing to extract the lithium by a manganese adsorbent; 3), preparing the battery-grade lithium carbonate, namely adding alkaline liquor into a desorption solution in the step 2), regulating a pH value to 7-12, producing manganese hydroxide precipitate, filtering the manganese hydroxide precipitate, concentrating filtrate until the lithium content reaches 20-30 g/L, filtering to remove sodium chloride, adding a saturated sodium carbonate solution to react, filtering, and subjecting filter cakes to water scrubbing so as to obtain the battery-grade lithium carbonate. The method has the advantages that hydrotalcite is obtained after magnesium removal, so that the problem of recycling the magnesium in the brine is solved; the content of various impurity ions in the desorption solution can be controlled effectively by removing the magnesium and extracting the lithium by adsorption sequentially, and then the battery-grade lithium carbonate is prepared.

Description

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Claims

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Application Information

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Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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