Process for extracting lithium from salt lake water subjected to calcium and magnesium preseparation

A salt lake water, pre-separation technology, applied in the direction of improving process efficiency, can solve problems such as high energy consumption, inability to carry out industrial application, and no proposal to recover acetone, etc., to achieve the effect of simple operation, reduced total cost, and strong compatibility

Inactive Publication Date: 2011-08-31
CENT SOUTH UNIV
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  • Claims
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Problems solved by technology

Using the method of reflux extraction, the obtained lithium-containing acetone solution is evaporated to drive away the acetone to obtain solid LiCl [2] , obviously this m

Method used

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  • Process for extracting lithium from salt lake water subjected to calcium and magnesium preseparation
  • Process for extracting lithium from salt lake water subjected to calcium and magnesium preseparation

Examples

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Embodiment 1

[0050] LiCl 12.15g NaCl 38.15g KCl 63g prepared mixed salt, add ethanol 350ml, stir and leaching at room temperature for 1hr, the leaching rate of LiCl is 91%, NaCl and KCl are basically not leached, (the content of Na and K in the leaching solution cannot be detected by atomic absorption method ).

Embodiment 2

[0052] Take 220ml of saturated K(Na)Cl solution containing 1.98g of Li, add 350ml of ethanol, stir and mix, then place it in the net, a large amount of K(Na)Cl crystals are precipitated from the alcohol-water mixture, and the KCl precipitation rate reaches 81.85%. Dehydrated ethanol was washed twice, all LiCl remained in the mixed solution, and Li / K (molar ratio) increased from 0.34 in the stock solution to 1.87 in the mixed solution.

Embodiment 3

[0054] Contain Li 5.80g / L ethanol 200ml, add 35ml concentration and be 240g / L (NH 4 ) 2 CO 3 The solution is subjected to sedimentation. The first-order precipitation rate of Li is 80.67%.

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Abstract

The invention relates to a process for extracting lithium from salt lake water subjected to calcium and magnesium preseparation. A low-carbon chain organic compound, such as ethanol, propanol or acetone as a solvent for extracting lithium is fully mixed with solid mixed salts obtained after salt lake water is subjected to calcium and magnesium removal or a saturated solution of the solid mixed salts so that LiCl enters an organic solvent, other salts are retained in a solid phase, and the aims of separating, extracting and purifying lithium are achieved. According to the obtained lithium-contained organic solution, lithium carbonate is precipitated by ammonium carbonate, and desalinization is carried out by a continuous ion exchange system consisting of hydrogenous and oxyhydrogen resin, or lithium chloride is directly removed from the lithium-chloride-containing organic solution by the continuous ion exchange system consisting of hydrogenous and oxyhydrogen resin. The organic solvent obtained after desalination treatment only contains water without salt, and the process is used for water separation recycling and organic solvent return process by adopting a pervaporation method.

Description

technical field [0001] The invention relates to a process for extracting lithium from lithium-containing salt lake water, in particular to a new method for further separating, extracting and purifying lithium chloride from the lithium-containing salt lake water after pre-separating calcium and magnesium. Background technique [0002] Lithium-containing saline lake water is currently the main resource for lithium extraction at home and abroad. my country's saline lake water resources are rich and diverse, mainly distributed in four provinces, Qinghai, Tibet, Xinjiang, and Inner Mongolia. Among them, the Qaidam Basin Salt Lake in Qinghai and the Zabuye Salt Lake in Tibet are the most famous. Their composition and reserves are shown in the table below. [0003] Reserves of lithium salts in major salt lakes in my country (calculated as LiCl, 10,000 t) and composition / wt% [0004] [0005] Although my country has certain advantages in terms of reserves, the quality of salt la...

Claims

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Application Information

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IPC IPC(8): C22B26/12C22B3/42C22B3/44
CPCY02P10/20
Inventor 肖连生曹佐英黄芍英李青刚曾理张启修
Owner CENT SOUTH UNIV
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