A method for separating magnesium and enriching lithium to produce lithium carbonate from low-lithium brine

A lithium carbonate, brine technology, applied in separation methods, chemical instruments and methods, lithium carbonate;/acid carbonate, etc., can solve the problems of solvent extraction technology without breakthrough changes, limitations, etc., to achieve Improve the separation ability of lithium and magnesium, enhance the extraction ability, and facilitate the effect of phase separation

Active Publication Date: 2017-04-05
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current solvent extraction method is limited to the liquid-liquid extraction process of brine, and the solvent extraction technology has not made breakthrough changes.

Method used

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  • A method for separating magnesium and enriching lithium to produce lithium carbonate from low-lithium brine
  • A method for separating magnesium and enriching lithium to produce lithium carbonate from low-lithium brine
  • A method for separating magnesium and enriching lithium to produce lithium carbonate from low-lithium brine

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Li in the old brine of a salt lake in Qaidam Basin, Qinghai + , Mg 2+ and The contents are 2.24, 118.00 and 39.87g / L respectively, and the mass ratio of magnesium to lithium is equal to 52.58. Take 350mL of the old brine in a 1000mL beaker, heat and concentrate it on a temperature-adjusting electric furnace, and evaporate the water accounting for 25% of the total mass of the old brine. After cooling, all the liquid will be precipitated and transformed into a brine salt containing crystal water. Transfer to a mechanically stirred container, add 354.5mL trihexyl phosphate to it, the solid-liquid mass volume ratio is equal to 1:1 (g / mL), and carry out solid-liquid extraction at room temperature for 30min. Subsequently, the solid-liquid mixture was moved into a sand core funnel for suction filtration under reduced pressure to obtain the organic extract phase of the filtrate and the remaining halogen salt. Heat the remaining brine salt until it is completely dissolved, a...

Embodiment 2

[0036] Get 350mL of the old brine from the salt lake in Example 1 in a 1000mL beaker, and add therein the LiCl H with an analytically pure content of 97%. 2 O 11.49g, the mass ratio of magnesium and lithium in the mixture is equal to 20.00. Heating and concentrating on a temperature-adjusting electric furnace evaporates 25% of the water that accounts for the total mass of the initial old brine, and after cooling, all the liquid is precipitated and transformed into a brine salt containing crystal water. Transfer to a mechanically stirred container, add 366.8mL trihexyl phosphate to it, the solid-liquid mass volume ratio is equal to 1:1 (g / mL), and carry out solid-liquid extraction at room temperature for 30min. Subsequently, the solid-liquid mixture was moved into a sand core funnel for suction filtration under reduced pressure to obtain the organic extract phase of the filtrate and the remaining halogen salt. Heat the remaining brine salt until it is completely dissolved, and...

Embodiment 3

[0042] Take 350 mL of the old brine from the salt lake in Example 1 in a 1000 mL beaker, and the mass ratio of magnesium to lithium is equal to 52.58. Heating and concentrating on a temperature-adjusting electric furnace evaporates the water accounting for 25% of the total mass of the old brine, and after cooling, all the liquid is precipitated and transformed into a brine salt containing crystal water. Transfer to a mechanically stirred container, add 354.7mL tributyl phosphate to it, the solid-liquid mass volume ratio is equal to 1:1 (g / mL), and carry out solid-liquid extraction at room temperature for 30min. Subsequently, the solid-liquid mixture was moved into a sand core funnel for suction filtration under reduced pressure to obtain the organic extract phase of the filtrate and the remaining halogen salt. Heat the remaining brine salt until it is completely dissolved, and then cool it to precipitate out, and obtain the brine salt containing crystal water for the second ti...

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Abstract

The present invention discloses a method for producing lithium carbonate from a low-lithium brine by separating magnesium and enriching lithium. A salt-lake brine is used as a raw material and is converted into halide salts through dehydration by evaporation and separation by crystallization; the halide salts are directly extracted using trialkyl phosphate or a mixture of trialkyl phosphate and monohydric alcohol, and an organic extraction phase as well as remaining halide salts are obtained after solid-liquid separation; reverse extraction is performed on the organic extraction phase to obtain a lithium-rich solution with a low magnesium-to-lithium ratio, and lithium carbonate is obtained after concentration and removal of magnesium by alkalization. The used solid-liquid extraction method is simple with no co-extraction agent used, and a solute distribution driving force is strong, unaffected by phase equilibrium of the brine extraction agent. The mass ratio of magnesium-to-lithium significantly decreases in the extraction phase.

Description

technical field [0001] The invention belongs to the field of inorganic chemical industry and relates to a core technology for extracting lithium from salt lake brine, in particular to an important method for separating magnesium from brine with a high magnesium-to-lithium ratio and enriching lithium to produce lithium carbonate. Background technique [0002] Lithium resources in nature mainly exist in the form of spodumene, lepidolite and petalite and other pegmatite deposits and salt lake liquid and solid deposits. The production cost of extracting lithium from rock minerals is high. Since the 1990s, it has been gradually replaced by the process of extracting lithium from salt lake brine. In the "Lithium Triangle" at the junction of Chile, Argentina, and Bolivia, Mg in the brines of Atacama Salt Lake, Homebreto Salt Lake and Uyuni Salt Lake 2+ With low content, it is a high-quality resource with a low magnesium-lithium ratio, and the production process is economical and si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D15/08
CPCC01D15/08B01D11/04B01D12/00C01F5/22C01F5/24C07B63/00C07F9/11
Inventor 杨立新王益付蜜齐红玉徐俞刘亚丽桂亚林何靖
Owner GUANGZHOU TINCI MATERIALS TECH
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