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Method for isolating magnesium and lithium from solution containing magnesium and lithium

A technology of lithium solution and magnesium lithium, which is applied in the direction of lithium carbonate; The effect of low production cost and low reagent consumption

Active Publication Date: 2017-05-10
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, it not only realizes the efficient separation of magnesium and lithium in brine, but also overcomes the disadvantages of incomplete separation of magnesium and lithium in the traditional precipitation method, large consumption of reagents, and high cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The original brine of a salt lake in the west of China was used for experiments. The main components and contents of the salt lake brine are shown in the following table:

[0022] Element Concentration (mg / L) Li +

[0023] Add 1L of original brine with a pH of 6.8 into the stirring reactor, then add 200ml of 500g / L sodium phytate solution, and stir and react at room temperature for 60min; after solid-liquid separation, the Mg in the filtrate 2+ The concentration is 20mg / L, Li + The concentration is 233mg / L, Mg 2+ and Li + The sedimentation rates of the samples were 99.8% and 0.1% respectively; the filter residue was dissolved with 10g / L of hydrochloric acid, diluted to pH 3 with deionized water, and the diluted solution was flowed through the D301 resin at a linear velocity of 1cm / min at room temperature. Clean the load resin with deionized water, then desorb the load resin with 0.5mol / L NaOH solution, adjust the pH of the obtained desorption solutio...

Embodiment 2

[0025] The experiment was carried out with salt lake brine with a low magnesium-lithium ratio. The main components and contents of the salt lake brine are shown in the following table:

[0026] Element Concentration (mg / L) Li +

[0027] Add 1L of original brine with a pH of 7.82 into the stirring reactor, then add 20ml of 500g / L potassium phytate solution, and stir at room temperature for 120min; after solid-liquid separation, the Mg in the filtrate 2+ The concentration is 18mg / L, Li + The concentration is 195mg / L, Mg 2+ and Li + The sedimentation rates of the samples were 98.5% and 0.55% respectively; the filter residue was dissolved with 10g / L of hydrochloric acid, diluted to pH 2 with deionized water, and the diluted solution was flowed through the D301 resin at a linear velocity of 12cm / min at room temperature. Clean the load resin with deionized water, then desorb the load resin with 0.1mol / L NaOH solution, adjust the pH of the obtained desorption solu...

Embodiment 3

[0029] The old brine from Dongtai Salt Lake in Qinghai was used in the experiment. The main components and contents of the old brine are shown in the following table:

[0030] Element Concentration (mg / L) Li +

[0031] Add 1L of old bittern with a pH of 4.67 to the stirred reactor, adjust its pH to 6.8 with NaOH solution, then add 780g of sodium phytate particles, and stir and react at room temperature for 120min; after solid-liquid separation, the Mg in the filtrate 2+ The concentration of Li is 22mg / L, Li + The concentration is 5638mg / L, Mg 2+ and Li + The sedimentation rates of the samples were 99.9% and 0.56% respectively; the filter residue was dissolved with 30g / L hydrochloric acid, diluted to pH 1 with deionized water, and the diluted solution was flowed through the D314 resin at a linear velocity of 5cm / min at room temperature, and used Clean the loaded resin with deionized water, then desorb the loaded resin with 0.5mol / L NaOH solution, adjust the ...

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Abstract

The invention relates to a method for isolating magnesium and lithium from solution containing magnesium and lithium; the method comprises: adjusting pH of the solution containing magnesium and lithium, adding soluble phytate into the solution containing magnesium and lithium, so that Mg<2+> in the solution containing magnesium and lithium forms water-insoluble complex precipitate while Li<+> remains in the solution; after solid-liquid separation, concentrating the solution containing Li<+>, precipitating to obtain lithium carbonate, dissolving the magnesium-containing precipitate with hydrochloric acid, adsorbing phytate ions therein through weak alkalinity anions in weak acidity environment, and using the obtained solution containing Mg<2+> to prepare a magnesium salt; using NaOH solution to desorb the resin that loads phytate ions for the purpose of regeneration, and using the desorbed solution to precipitate Mg<2+> in solution containing magnesium and lithium in next cycle. The method has a short process, is simple to perform, and is efficient for isolating magnesium and lithium from the solution containing magnesium and lithium, the phytate is recyclable, the production cost is low, and the method is easily industrially applicable.

Description

technical field [0001] The invention belongs to the technical field of separation of magnesium and lithium in salt lake brine, and in particular relates to a method for efficiently separating magnesium and lithium in solutions containing magnesium and lithium. Background technique [0002] Lithium is becoming more and more important in modern industry and is known as "the new energy metal in the 21st century". When Obama took office, he positioned lithium as a national strategic material that is as important as oil. With the rapid development of the new energy industry, the market demand for lithium has expanded rapidly, and the mining of lithium resources has become more important. [0003] In nature, lithium resources mainly exist in brine, especially salt lake brine, and its reserves account for more than 80% of the total lithium resource reserves. At present, more than 85% of the world's lithium products come from salt lake brine, and most of them are monopolized by Ch...

Claims

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Application Information

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IPC IPC(8): C01D15/08
CPCC01D15/08
Inventor 刘旭恒赵中伟
Owner CENT SOUTH UNIV
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