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Method for separating magnesium and lithium and enriching lithium from salt lake brine

A technology of salt lake brine and brine magnesium, which is applied in the direction of improving process efficiency, can solve the problems of serious equipment corrosion, unfavorable large-scale production, and low product purity.

Active Publication Date: 2013-03-13
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Researchers use precipitation method, carbonization method, ion exchange method, solvent extraction method and other technologies to develop lithium resources in brine, but most of these methods are complicated in process, high in cost, severely corroded to equipment, and the product purity is not high, which is not conducive to mass production

Method used

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  • Method for separating magnesium and lithium and enriching lithium from salt lake brine
  • Method for separating magnesium and lithium and enriching lithium from salt lake brine
  • Method for separating magnesium and lithium and enriching lithium from salt lake brine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] According to the weight ratio of 20:1:1, 10gFePO 4 Mix ion sieve, 0.5g high-purity graphite and 0.5g PVDF evenly, add N-methylpyrrolidone (NMP) organic solvent to the mixed powder, grind and adjust the slurry, coat the slurry on a graphite plate, and heat it at 110°C Insulated and dried in a vacuum box for 12 hours, the ferric phosphate ion sieve composite membrane was obtained after cooling; the ferric phosphate composite membrane was placed in the brine chamber of the electrodialysis device, and the top view schematic diagram of the electrodialysis device is as follows figure 1 Shown; Add 2L of a salt lake brine into the brine chamber, the main components and contents of the salt lake brine are shown in the following table:

[0046]

[0047] Add 500mL of NaCl solution with a concentration of 20g / L into the lithium salt chamber of the electrodialysis device; use the iron phosphate ion sieve membrane as the cathode, and use the inert graphite in the lithium salt cham...

Embodiment 2

[0050] According to the weight ratio of 90:5:5, 9gFe 0.99 mn 0.01 PO 4 , 0.5g of high-purity graphite and 0.5g of PVDF are mixed evenly, and the mixed powder is added to N-methylpyrrolidone (NMP) organic solvent for grinding and slurrying, and the slurry is sprayed or brushed on the ruthenium-titanium mesh, and the mixture is vacuum-conditioned Heat preservation and drying at 110°C for 10 hours, and obtain an iron phosphate ion sieve composite membrane after cooling.

[0051] Put the iron phosphate composite film in the brine chamber, add 2L salt lake brine, the composition and content of the brine are shown in the following table:

[0052]

[0053] Add 200mL of NaCl solution with a concentration of 50g / L into the lithium salt chamber of the electrodialysis device; use the iron phosphate ion sieve membrane as the cathode, and use the Pt electrode in the lithium salt chamber as the anode, and apply a voltage of 1.0V across the electrodes , after maintaining at 50°C for 10...

Embodiment 3

[0056] By the method of embodiment 2, 3g Fe 0.98 co 0.02 PO 4 Make iron phosphate composite film, put iron phosphate composite film in brine chamber, add 500mL salt lake brine, the composition and content of salt lake brine are shown in the following table:

[0057]

[0058]Add 500mL of NaCl solution with a concentration of 50g / L into the lithium salt chamber, use the iron phosphate composite film as the cathode, and inert graphite as the anode, apply a voltage of 2.0V, and after maintaining it at 80°C for 10h, Li in the brine chamber + The concentration was reduced to 268.4mg / L, Mg 2+ The concentration is 17991mg / L, Fe 0.98 co 0.02 PO 4 ion sieve for Li + The adsorption capacity is 38.6mg / g, for Mg 2+ The adsorption capacity is 1.5mg / g.

[0059] According to the same method in this example, 3g Fe 0.98 co 0.02 PO 4 The ion sieve is made into an iron phosphate composite membrane without lithium intercalation. After the initial lithium intercalation is completed, ...

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Abstract

The invention relates to a method and a device for separating magnesium and lithium and enriching the lithium from salt lake brine. The method comprises the following steps of: separating an electrodialyzing device into two areas by using an anion exchange membrane, namely a lithium salt chamber and a brine chamber, filling the salt lake brine in the brine chamber, and filling a supporting electrolyte solution which does not contain Mg<2+> in the lithium salt chamber; placing a conducting matrix coated by an ionic sieve in the brine chamber as a cathode; placing the conducting matrix coated by a lithium-embedded ionic sieve in the lithium salt chamber as an anode; under the driving of an external electric potential, embedding Li <1+> in the brine in the brine chamber into the ionic sieve to form the lithium-embedded ionic sieve, and recovering the lithium-embedded ionic sieve into the ionic sieve after the lithium-embedded ionic sieve in the lithium salt chamber releases the Li <1+> into a conducting solution; and discharging a liquid in the brine chamber after the lithium is embedded, adding the salt lake brine again, alternatively placing electrodes in the two chambers, and repeating and circulating operations. Through the method and the device for separating magnesium and lithium and enriching lithium in the salt lake brine, the separation of the lithium and other ions is effectively realized, and a lithium-enriched solution is synchronously obtained. The method has a short flow and low production cost, is simple to operate, can be operated continuously, and is easy to industrially apply.

Description

technical field [0001] The invention belongs to the field of extraction metallurgy, and specifically relates to a method and a device for directly treating salt lake brine to separate magnesium and lithium, and then enrich lithium. Background technique [0002] Since lithium-ion batteries were commercialized by Sony in 1990, lithium has become more and more important in modern industry, and is known as "the new energy metal in the 21st century". Due to its high energy density and long cycle life, lithium-ion Batteries are widely used in electronic equipment, and the market demand for lithium is expanding rapidly, so the mining of lithium resources becomes more important. [0003] In nature, lithium mainly exists in two forms of ore and brine. Most lithium resources exist in brine, especially in salt lake brine, and its reserves account for more than 80% of the total lithium resource reserves. With the growth of market demand, mineral lithium resources are in short supply an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B26/12
CPCY02P10/20
Inventor 赵中伟刘旭恒李洪桂梁新星司秀芬何利华
Owner CENT SOUTH UNIV
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