Method of extracting lithium

A technology for extracting lithium and lithium solution, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve problems such as undeveloped, uneconomical, calcium carbonate sludge, etc.

Active Publication Date: 2020-01-14
全雄
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to remove magnesium from brine, caustic soda (NaOH) or calcium hydroxide (Ca(OH) 2 ) and other alkali compounds, but the more magnesium content, the more alkali needs to be invested, so there is an increase in the pretreatment cost for extracting lithium, and a large amount of magnesium hydroxide (Mg(OH) 2 ) The problem of sludge
[0009] In addition, calcium is obtained by adding sodium carbonate (Na 2 CO 3 ) or sodium sulfate (Na 2 SO 4 ) and other salt (Salt) to remove, but in the same way, the more calcium content, the more input of sodium carbonate or sodium sulfate, so there is an increase in pre-treatment costs, and a large amount of calcium carbonate (CaCO 3 ) or gypsum (CaSO 4 "2H 2 O) The problem of sludge
[0010] Due to the above-mentioned problems, brines containing a large amount of alkaline earth metal impurities are classified as uneconomical brines and cannot be developed, and lithium can only be produced from brines containing a small amount of alkaline earth metals
However, at present, most of the brines that exist in nature contain a large amount of alkaline earth metal impurities, and brines containing a small amount of alkaline earth metal impurities are very rare

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Embodiment

[0056] Add Na at a concentration of 23 g / L to a lithium-containing solution derived from brine in which lithium ions are dissolved at a concentration of about 3000 mg / L and magnesium ions are dissolved at a concentration of 9448 mg / L to 53543 mg / L. 3 PO 4 Thereafter, stirring was performed at normal temperature for 120 minutes to perform a reaction.

[0057] After the reaction was completed, the lithium-containing solution was filtered and the reaction precipitate was separated, then the remaining filtrate was extracted, and the concentrations of lithium, magnesium, calcium and strontium were measured, and the results are shown in Table 2.

[0058] [Table 2]

[0059]

[0060] In addition, the reaction precipitate was dried at 60°C for 24 hours, and the mineral phase was analyzed by X-ray diffraction analyzer, and the results were shown in figure 2 middle.

[0061] As shown in Table 2, it can be seen that when a phosphorus supply material is added to a lithium-containing...

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Abstract

The present invention relates to a method for extracting lithium. The method comprising the steps of: preparing a lithium-containing solution containing an alkaline earth metal; controlling the activity of alkaline earth metal in the lithium-containing solution; and adding a phosphorus supply material to the lithium-containing solution to precipitate lithium phosphate.

Description

technical field [0001] The present invention relates to a method for extracting lithium, more particularly, to a method for economically extracting lithium from a lithium-containing solution containing impurities. Background technique [0002] Lithium (Li) is an essential raw material in industry used in various industries. In recent years, secondary lithium batteries have attracted attention as a power source for electric vehicles, and are also widely used as power sources for IT equipment such as mobile phones and notebook computers. As the use of lithium-based automobiles and electronic devices has exploded, so has the demand for lithium in the world market. [0003] Lithium resources existing in nature are sea water, mineral, and brine. [0004] It is well known that although seawater contains lithium at a very low concentration of about 0.17 mg / L, it is not economical to selectively extract lithium from seawater for industrial use because it is inefficient. In recent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/30
CPCC01B25/30Y02P10/20
Inventor 全雄
Owner 全雄
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