Method for extracting lithium from solution containing lithium

A lithium solution and lithium extraction technology, applied in chemical instruments and methods, extraction water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of difficulty in recovering lithium carbonate and extracting lithium, and achieve a high recovery rate , the effect of efficient extraction

Active Publication Date: 2015-09-02
RES INST OF IND SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In addition, when the brine containing a large amount of carbonate ions is concentrated to a lithium concentration greater than or equal to 2.481g / L [the solubility of lithium carbonate is 13.2g / L, (20°C)], it will be precipitated as lithium carbonate, so lithium cannot be Concentrate to a concentration above
[0010] Moreover, when concentrated to a solubility greater than or equal to lithium carbonate, although the lithium in the brine is precipitated as lithium carbonate, a large amount of salt including sodium chloride (NaCl) will be precipitated together, so it is actually difficult to recover pure lithium carbonate
[0011] Therefore, brines containing a large amount of carbonate ions are difficult to extract lithium by existing natural evaporation methods, so it is necessary to develop an efficient lithium extraction process

Method used

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  • Method for extracting lithium from solution containing lithium
  • Method for extracting lithium from solution containing lithium
  • Method for extracting lithium from solution containing lithium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0165] Example 1: Concentrating the brine containing carbonate ions and separating the precipitate from solid-liquid

[0166] According to the following table 1, the preparation containing Li, Na, K, SO 4 , Cl, CO 3 etc. solution.

[0167] [Table 1]

[0168]

[0169] For the prepared as above containing Li, Na, K, SO 4 , Cl, CO 3 etc., using an evaporating concentrator, and evaporated under reduced pressure at a temperature of 40°C.

[0170] figure 1 Data showing changes in the concentration of lithium ions in the filtrate according to the amount of water evaporation when brine is concentrated.

[0171] When the brine is concentrated, as the water evaporates, the lithium concentration in the brine starts to rise from the initial 1.04g / L, and increases to 1.80g / L when the water evaporation is 37.8%.

[0172] However, when the water evaporation was greater than or equal to 37.8%, the lithium concentration did not increase even though the brine was concentrated, becau...

Embodiment 2

[0175] Example 2: Extraction of lithium phosphate from concentrated brine

[0176] Table 2 below shows the dissolved ion concentration in the filtered solution after evaporating 37.8% of the water in the brine containing a large amount of carbonate ions.

[0177] [Table 2]

[0178]

[0179] The lithium concentration of the concentrated filtered solution was 1.8 g / L, and after adding phosphoric acid equivalent to the lithium concentration equivalent, the lithium concentration was measured at room temperature at different times.

[0180] figure 2 Data showing the lithium concentration in the brine as a function of time after the addition of phosphoric acid.

[0181] Such as figure 2 As shown, the lithium concentration was initially 1.8g / L, and gradually decreased over time, and when the reaction time was 3 hours, the lithium concentration was 0.4g / L, and the lithium recovery rate was 77.7%.

[0182] image 3 shows the mineral phase analysis results of the precipitate...

Embodiment 3

[0183] Example 3: Reconcentration of Filtration Solution and Extraction of Lithium Phosphate Using Nuclear Particles

[0184] The brine from which the lithium has been extracted is concentrated again to a range in which lithium is not precipitated. The main mineral phases of the precipitate are NaCl, KCl and NaK 3 (SO 4 ) 2 .

[0185] Table 3 below shows the composition of the filtered solution when the moisture evaporation rate is 60%.

[0186] [table 3]

[0187] project

Li

Na

K

SO 4

CO 3

Cl

Concentration(g / L)

0.877

143.1

74.6

21.0

67.9

156.5

[0188] To extract lithium from the solution, lithium phosphate was added as a seed to 1 equivalent of dissolved lithium, at which point no water-soluble phosphoric acid was added, and the lithium concentration at different times was subsequently measured.

[0189] Figure 4 The data showing the lithium concentration in the brine as a function of time a...

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Abstract

The present invention relates to a method for extracting lithium from a solution containing lithium, and more particularly, to a method for extracting lithium from a solution containing lithium, comprising the steps of: preparing a solution containing lithium including carbonate ions; obtaining a first precipitate by concentrating the solution containing lithium in order to allow the lithium concentration to be 2.481 g/L or less; performing solid-liquid separation of the concentrated solution containing lithium and the first precipitate; precipitating dissolved lithium as lithium phosphate by inputting a phosphor supplying material into the concentrated solution containing lithium; obtaining a second precipitate by re-concentrating a filtrate with the precipitated lithium phosphate in order to allow the lithium concentration to be 2.481 g/L or less; performing solid-liquid separation of the re-concentrated filtrate and the second precipitate; and precipitating the dissolved lithium as lithium phosphate by inputting nuclear particles into the re-concentrated filtrate.

Description

technical field [0001] The invention relates to a method for extracting lithium from a lithium-containing solution. Background technique [0002] Lithium is currently widely used in various industries such as rechargeable batteries, glass, ceramics, alloys, lubricants, medicine, and the like. In particular, rechargeable lithium batteries have recently attracted attention as a main power source for hybrid and electric vehicles. In addition, the market for existing small batteries used in mobile phones, notebook computers, etc. is expected to continue to grow to a huge market about 100 times the current size. [0003] In addition, due to the global movement towards stricter environmental regulations, lithium has been increasingly used in fields such as electronics, chemicals and energy, in addition to the hybrid and electric vehicle industries. It is therefore expected that in the 21st century, domestic and foreign demand for lithium will increase dramatically in the entire ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B26/12C02F1/26
CPCC02F1/5236C22B26/12
Inventor 全雄金畿永韩基天张永硕宋昌浩朴运炅丁基忆郑索拉
Owner RES INST OF IND SCI & TECH
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