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A method for extracting lithium carbonate from high magnesium-lithium ratio salt lake brine

A salt lake brine, high magnesium-lithium ratio technology, applied in lithium carbonate;/acid carbonate, nanotechnology and other directions, can solve the problems of inability to extract, easy to form third phase, low cycle process efficiency, etc. To achieve the effect of reducing acid mist and corrosion to equipment, smooth circulation process, and saving water and acid washing

Inactive Publication Date: 2011-12-14
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main problem of this method is that the extraction agent used is easy to form a third phase during the extraction process, and the accumulation leads to lower and lower efficiency of the circulation process, and finally the extraction cannot be carried out; the concentration of hydrochloric acid used in the stripping process is too high, which is easy to cause acid mist , and the equipment is severely corroded, and cannot be operated continuously

Method used

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  • A method for extracting lithium carbonate from high magnesium-lithium ratio salt lake brine

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Effect test

Embodiment 1

[0018] The simulated salt lake brine was prepared, and the composition was lithium (0.05mol / L), magnesium (3.5mol / L) and chlorine (7.05mol / L).

[0019] The step of extracting lithium carbonate from above-mentioned simulated salt lake brine is as follows:

[0020] (1) Mix tributyl phosphate and 2,6-dimethyl-4-heptanone to make an extractant, tributyl phosphate and 2,6-dimethyl-4-heptanone respectively account for tributyl phosphate 50%, 50% of the total volume of ester and co-solvent;

[0021] (2) Iron trichloride and extractant are added successively in salt lake brine, the concentration of ferric chloride and lithium concentration ratio are 2: 1, the volume ratio of the volume of extractant and salt lake brine is 1: 1, carry out extraction ;

[0022] (3) HCl solution and LiCl solution are mixed to make detergent, and the solution concentration of HCl and LiCl is 1mol / L and 1mol / L respectively; In the organic phase that adds step (2) to separate, organic phase and detergent ...

Embodiment 2

[0027] The simulated salt lake brine was prepared, and the composition was lithium (0.05mol / L), magnesium (3.5mol / L) and chlorine (7.05mol / L).

[0028] The step of extracting lithium carbonate from above-mentioned simulated salt lake brine is as follows:

[0029] (1) Tributyl phosphate and sec-octanol are mixed to make an extractant, and tributyl phosphate and sec-octanol account for 80%, 20% of the total volume of tributyl phosphate and co-solvent respectively;

[0030] (2) Chromium trichloride and extractant are added to salt lake brine successively, the concentration of chromium trichloride and lithium concentration ratio are 2: 1, the volume ratio of the volume of extractant and salt lake brine is 2: 1, carry out extraction ;

[0031] (3) HCl solution and LiCl solution are mixed to make detergent, and the solution concentration of HCl and LiCl is 1mol / L and 1mol / L respectively; In the organic phase that adds step (2) to separate, organic phase and detergent The volume ra...

Embodiment 3

[0036] Prepare simulated salt lake brine, lithium (0.2mol / L), magnesium (4.0mol / L), sodium (0.07mol / L), potassium (0.02) and chlorine (8.29mol / L).

[0037] The step of extracting lithium carbonate from above-mentioned simulated salt lake brine is as follows:

[0038] (1) Tributyl phosphate and n-octanol are mixed to make an extractant, and tributyl phosphate and n-octanol account for 80%, 20% of the total volume of tributyl phosphate and cosolvent respectively;

[0039] (2) Iron trichloride and extractant are added to salt lake brine successively, the concentration of ferric chloride and lithium concentration ratio are 1.5: 1, the volume ratio of the volume of extractant and salt lake brine is 1: 1, carry out extraction ;

[0040] (3) HCl solution and LiCl solution are mixed to make detergent, and the solution concentration of HCl and LiCl is 1mol / L and 1mol / L respectively; In the organic phase that adds step (2) to separate, organic phase and detergent The volume ratio is 30:...

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Abstract

The invention discloses a method for extracting lithium carbonate from salt lake brine with high magnesium / lithium ratio, belonging to the technical filed of inorganic salt extraction. The method comprises the following steps of: carrying out extraction, washing and stripping steps to obtain a stripping solution composed of NaCl and LiCl or NH4Cl and LiCl, then introducing CO2 or adding Na2CO3, and controlling the pH value and dynamic conditions to obtain a nanoscale or microscale Li2CO3 product. The method disclosed by the invention has the advantages of simple steps, low equipment requirement and wide sources of raw materials, and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of inorganic salt extraction, and in particular relates to a method for extracting lithium carbonate from high-magnesium-lithium ratio salt lake brine. Background technique [0002] In recent years, lithium, known as the "energy metal of the 21st century", is becoming a focus of attention and development in modern industrial production. In the past 10 years, the total demand for lithium in the world has continued to grow at a rate of 7% to 11% per year. In my country, the market demand for lithium and lithium salts has grown at an average rate of 20% to 25% per year, and the market price has also been maintained. upward momentum. The content of lithium resources in my country's salt lake brine is quite rich, and the development and extraction of lithium carbonate is of great significance to the national economy. Lithium carbonate is the basic compound of the lithium industry. It is widely used in ceramic pr...

Claims

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Application Information

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IPC IPC(8): C01D15/08B82Y40/00
Inventor 秦炜周智勇谭元忠梁胜轲费维扬
Owner TSINGHUA UNIV
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