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Method for extracting lithium from water with high magnesium-lithium ratio and preparing lithium carbonate

A high magnesium-lithium ratio, lithium carbonate technology, applied in lithium carbonate;/acid carbonate, chemical instruments and methods, heating water/sewage treatment, etc., to avoid incomplete precipitation of magnesium ions, high purity, Larger effect of avoiding lithium loss

Pending Publication Date: 2020-07-14
孟元
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above-mentioned problem that the current technology cannot realize the advantages of high-efficiency and low-cost production of lithium carbonate, the present invention provides a method for extracting lithium from water with a high magnesium-lithium ratio and preparing lithium carbonate, using an adsorption-extraction method to extract lithium ions and prepare high-purity Lithium carbonate, the method has low lithium loss rate, low energy consumption, high purity, and can be recycled and continuously produced

Method used

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  • Method for extracting lithium from water with high magnesium-lithium ratio and preparing lithium carbonate
  • Method for extracting lithium from water with high magnesium-lithium ratio and preparing lithium carbonate
  • Method for extracting lithium from water with high magnesium-lithium ratio and preparing lithium carbonate

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Embodiment 1

[0032] (1) Adsorption process: select Qinghai Salt Lake brine with a lithium ion content of 0.15g / L (containing Mg 2+ 、Na + 、K + 、Cs + , Pb + , Cl - , SO 4 2- and other impurities), the pH value of which is 4.0, the lithium-containing water is passed into the device containing manganese-based adsorbents, and lithium and a small amount of impurity magnesium are separated from the water by adsorption, and the adsorption time is 15 minutes;

[0033] (2) Desorption process: Pass the saturated manganese-based adsorbent into pure water, then pass pure water and carbon dioxide into the system as the eluent, control the desorption temperature at 30°C, and the desorption time for 15 minutes. The ions on the adsorbent are dissolved in water to obtain a desorption solution containing 0.135 g / L of lithium ions;

[0034] (3) Remove impurities and concentrate: add a certain amount of NaOH to the desorption solution, adjust the desorption solution to a pH value of 7.6, and remove most...

Embodiment 2

[0042] (1) Adsorption process: select old salt lake salt brine with a lithium ion content of 0.075g / L, and its pH value is 4.5, pass the lithium-containing water into the device containing aluminum-based adsorbents, and absorb lithium and a small amount of impurities by adsorption Magnesium is separated from water; the adsorption time is 10min;

[0043] (2) Desorption process: put the saturated aluminum-based adsorbent into pure water, add an appropriate eluent, the eluent is pure water at 40°C, control the desorption temperature at 40°C, and the desorption time for 10 minutes. The ions on the adsorbent are dissolved in water to obtain a desorption solution containing 0.045 g / L of lithium ions;

[0044] (3) Remove impurities and concentrate: add a certain amount of NaOH to the desorption solution, adjust the desorption solution to a pH value of 8, and remove most of the impurity ions such as magnesium, calcium, and barium in the desorption solution; use MVR three-effect evapor...

Embodiment 3

[0052] (1) Adsorption process: select old salt lake salt brine with a lithium ion content of 0.075g / L, and its pH value is 4.5, pass the lithium-containing water into the device containing aluminum-based adsorbents, and absorb lithium and a small amount of impurities by adsorption Magnesium is separated from water; the adsorption time is 10min;

[0053] (2) Desorption process: put the saturated aluminum-based adsorbent into pure water, add an appropriate eluent, the eluent is hydrochloric acid with a concentration of 0.1%, control the desorption temperature at 40°C, and the desorption time for 10 minutes , the ions adsorbed on the adsorbent are dissolved in water to obtain a desorption solution containing 0.045 g / L of lithium ions;

[0054] (3) Remove impurities and concentrate: add a certain amount of NaOH to the desorption solution, adjust the desorption solution to a pH value of 8, and remove most of the impurity ions such as magnesium, calcium, and barium in the desorption...

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Abstract

The invention belongs to the technical field of chemical engineering. In order to solve the problem that efficient and cheap production of lithium carbonate cannot be achieved through an existing process, the invention provides a method for extracting lithium from water with the high magnesium-lithium ratio and preparing lithium carbonate, an adsorption-extraction method is adopted for extractinglithium ions and preparing high-purity lithium carbonate. The method comprises the steps of firstly, introducing water containing lithium into an adsorbent to be adsorbed and desorbed; adding a certain amount of alkali into the desorption solution to remove impurities such as magnesium; then uniformly mixing the desorbed liquid after impurity removal with an extraction agent according to a certainproportion, and carrying out phase splitting to obtain an extraction liquid; mixing the extracting solution with a stripping agent, and carrying out phase splitting to obtain lithium bicarbonate; andfinally, heating and decomposing the obtained lithium bicarbonate, crystallizing and separating out, washing and drying to obtain high-yield and high-purity battery-grade lithium carbonate. Accordingto the method, the lithium ions can be efficiently extracted in an environment-friendly manner under the condition that the magnesium-lithium ratio is greater than 500:1; energy consumption is low, purity is high, selectivity is good, the recovery rate is high, and cyclic continuous production can be achieved.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for extracting lithium from water with a high magnesium-lithium ratio and preparing lithium carbonate. Background technique [0002] Lithium metal and its lithium salts are widely used, because of their more stable chemical properties, higher safety factor, and no pollution than other batteries, they have become the best materials for the production of lithium-ion batteries, and are important for the development of new energy and new materials. Metal. At present, the application fields of lithium are still expanding, and the demand for lithium is increasing all over the world. In particular, the rapid development of the new energy industry has led to a sharp increase in the market demand for lithium, which also determines the significance of developing lithium resources. [0003] The specific production of lithium carbonate is in a monopoly patter...

Claims

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Application Information

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IPC IPC(8): C01D15/08C02F9/10
CPCC01D15/08C01P2006/80C02F1/02C02F1/26C02F1/28C02F9/00
Inventor 孟元
Owner 孟元
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