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A method for enriching lithium in sodium sulfate sub-salt type salt lake brine

A salt lake brine and sodium sulfate technology, applied in chemical instruments and methods, lithium compounds, alkali metal compounds, etc., can solve the problems of complex process, long time, large investment, etc., and achieve simple process flow, strong adsorption capacity, and improved efficiency. Effect

Active Publication Date: 2016-07-13
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of natural concentration and enrichment of lithium has the disadvantages of low yield and long time consumption; the method of forced evaporation concentration and enrichment of lithium takes a short time, but the lithium yield is very low; the method of variable temperature evaporation concentration enrichment of lithium, lithium recovery Both the efficiency and the time-consuming of the former two have improved, but when extracting lithium from the old brine enriched with lithium, the sulfate and magnesium ions in the old brine are the main influencing ions, and it is necessary to invest in the corresponding technological process to specifically remove sulfuric acid roots and magnesium ions, so the input is larger
[0006] The patent application with the application number 201310320200.0 "A Method for Enriching Lithium from Carbonate-type Salt Lake Brine" discloses the use of temperature-changing methods to enrich lithium in brines, and freezing to remove sulfate ions in the liquid phase, but This method has the defect of incomplete ion removal. When lithium-rich old halogen is used to precipitate lithium carbonate, the process of removing sulfate and magnesium ions is required. The process is complicated and takes a long time.

Method used

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  • A method for enriching lithium in sodium sulfate sub-salt type salt lake brine

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1 A method for enriching lithium from sodium sulfate subtype salt lake brine, comprising the following steps:

[0026] (1) After mixing the brine of a salt lake in Tibet evenly, place it in an evaporation pool as a raw material for enriching lithium;

[0027] (2) Take 100kg of brine, place it in the evaporation chamber, adjust the temperature of the simulation chamber, so that the temperature of the brine is controlled at 15°C, and the electric fan is intermittently exhausted;

[0028] The composition of brine in the described (2) refers to K + 、Na + , Cl - , SO 4 2- The main solution, where K + The mass content is 0.16%, Na + The mass content is 1.98%, the Cl-mass content is 1.25%, SO 4 2- The mass content is 1.68%, Li + The mass content is 0.018%, Mg 2+ The mass content is 0.07%;

[0029] (3) Monitoring Mg in brine during evaporation 2+ , Li + Concentration, when Li + Mass concentration 0.12%, Mg 2+ The mass concentration is 0.15%, and the br...

Embodiment 2

[0036] Embodiment 2 A method for enriching lithium from sodium sulfate subtype salt lake brine, comprising the following steps:

[0037] (1) After mixing the brine of a salt lake in Tibet evenly, place it in an evaporation pool as a raw material for enriching lithium;

[0038] (2) Get 100kg of brine, place it in the evaporation chamber, adjust the temperature of the simulation chamber, make the temperature of the brine be controlled at 15°C, and discharge the air intermittently with an electric fan; the composition of the brine in (2) refers to K + 、Na + , Cl- , SO 4 2- The main solution, where K + The mass content is 0.23%, Na + The mass content is 0.85%, the Cl- mass content is 1.29%, the SO 4 2- The mass content is 2.00%, Li + The mass content is 0.0016%, Mg 2+ The mass content is 0.08%;

[0039] (3) Monitoring Mg in brine during evaporation 2+ , Li + Concentration, when Li + Mass concentration 0.19%, Mg 2+ The mass concentration is 0.25%, and the brine and the...

Embodiment 3

[0046] Embodiment 3 A method for enriching lithium from sodium sulfate subtype salt lake brine, comprising the following steps:

[0047] (1) After mixing the brine of a salt lake in Tibet evenly, place it in an evaporation pool as a raw material for enriching lithium;

[0048] (2) Take 100kg of brine, place it in the evaporation chamber, adjust the temperature of the simulation chamber, so that the temperature of the brine is controlled at 15°C, and the electric fan is intermittently exhausted;

[0049] The composition of brine in the described (2) refers to K + 、Na + , Cl - , SO 4 2- The main solution, where K + The mass content is 0.20%, Na + The mass content is 1.00%, Cl - The mass content is 0.89%, SO 4 2- The mass content is 2.04%, Li + The mass content is 0.019%, Mg 2+ The mass content is 0.05%;

[0050] (3) Monitoring Mg in brine during evaporation 2+ , Li + Concentration, when Li + Mass concentration 0.17%, Mg 2+ The mass concentration is 0.20%, and the...

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Abstract

The invention discloses a method for gathering lithium from sodium sulfite salt type salt lake brine. The method comprises the following steps of: (1) naturally evaporating to concentrate salt lake brine till the mass content of Li<+> is 0.12%-0.17%, the mass content of Mg<2+> is 0.15%-0.20% and the mass ratio of magnesium to lithium is (1.18-1.32):1 in the salt lake brine, wherein the mass content of the Li<+> is 0.016%-0.019% and the mass content of the Mg<2+> is 0.05%-0.08% in the salt lake brine, and the mass ratio of magnesium to lithium is (2.6-5):1 in the salt lake brine; (2) circularly adsorbing the concentrated salt lake brine by using a bauxite adsorption column till the potassium content of the circulating salt lake brine is lower, eluting the bauxite adsorption column by using water to obtain a lithium-containing eluent, and returning the circulating salt lake brine to a salt pan for natural evaporation to serve as a raw material used for extracting potassium salt; (3) carrying out freeze concentration on the lithium-containing eluent to obtain a solid-liquid mixture, and carrying out solid-liquid separation; (4) naturally evaporating a frozen liquid phase for concentration.

Description

technical field [0001] The invention belongs to the field of salt lake chemistry, and in particular relates to a method for enriching lithium in sodium sulfate sub-salt type salt lake brine. Background technique [0002] Lithium resources in my country are mainly distributed in the salt lakes of the Qinghai-Tibet Plateau. Lithium resources in Tibet are mainly carbonate-type and sodium sulfate sub-type salts. Tibet’s salt lake resources mainly exist in liquid brine. Lithium ions mainly exist after natural sunlight evaporation. With KLiSO 4 , NaLiSO 4 、3Li 2 SO 4 ·H 2 O. Li 2 CO 3 Lithium ions in brine are saturated with evaporation and crystallize out, and the amount of precipitation is dispersed, which is very unfavorable to the extraction of lithium. [0003] In the prior art, the isothermal evaporation method is usually used to evaporate and concentrate brine for the enrichment of lithium. After the lithium ions are saturated in the liquid phase during the evaporati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D15/00
Inventor 马艳芳董生发张志宏张永明赵冬梅付振海王婧
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI