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Method for enriching lithium in carbonate type salt lake brine

A salt lake brine, carbonate type technology, applied in the directions of alkali metal sulfite/sulfite, chemical instruments and methods, lithium compounds, etc., to achieve the effect of low energy consumption

Active Publication Date: 2013-11-13
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In addition, the current method of enriching lithium from salt lake brine is mainly for sulfate-type salt lake brine, and the enrichment of lithium ions for carbonate-type salt lake brine is still an urgent problem to be solved

Method used

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  • Method for enriching lithium in carbonate type salt lake brine
  • Method for enriching lithium in carbonate type salt lake brine
  • Method for enriching lithium in carbonate type salt lake brine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] S101 The first high-temperature evaporation: After mixing the brine of a salt lake in Tibet evenly, place it in an evaporation pool for high-temperature evaporation (under the condition that the temperature of the brine in the salt lake is about 25°C), and obtain the first liquid-phase brine.

[0050] S102 The first low-temperature evaporation: Take 400kg of the first liquid-phase brine and place it in the environmental simulation room. Adjust the temperature of the simulation room to control the temperature of the brine at 4.0°C. The electric fan is intermittently exhausted at a wind speed of 2.80m / s. Monitoring Li in brine during evaporation + Concentration, when Li + When the mass concentration is 0.4000%, the brine and the evaporated salt mine are subjected to solid-liquid separation to obtain 26 kg of the second solid phase salt mine in the solid phase and 13.58 kg of the second liquid phase brine.

[0051] S103 Cooling for the first time: place the second liquid-...

Embodiment 2

[0061] S201 The first high-temperature evaporation: After mixing the brine of a salt lake in Tibet evenly, place it in an evaporation pool for high-temperature evaporation (under the condition that the temperature of the brine in the salt lake is about 10°C), and obtain the first liquid-phase brine.

[0062] S202 The first low-temperature evaporation: Take 400kg of the first liquid-phase brine and place it in the environmental simulation room. Adjust the temperature of the simulation room to control the temperature of the brine at 5.5°C. The electric fan is intermittently exhausted, and the wind speed is controlled at 3.50m / s. Monitoring Li in brine during evaporation + Concentration, when Li + When the mass concentration is 0.4500%, the brine and the evaporated salt mine are subjected to solid-liquid separation to obtain 30.0 kg of the second solid phase salt mine in the solid phase and 13.28 kg of the second liquid phase brine.

[0063] S203 Cooling for the first time: plac...

Embodiment 3

[0073] S301 The first high-temperature evaporation: After mixing the brine of a salt lake in Tibet evenly, place it in an evaporation pool for high-temperature evaporation (under the condition that the temperature of the brine in the salt lake is about 30°C), and obtain the first liquid-phase brine.

[0074] S302 The first low-temperature evaporation: Take 400kg of the first liquid-phase brine and place it in the environmental simulation room. Adjust the temperature of the simulation room to control the temperature of the brine at 6.0°C. The electric fan is intermittently exhausted, and the wind speed is controlled at 3.80m / s. Monitoring Li in brine during evaporation + Concentration, when Li + When the mass concentration is 0.5000%, the brine and the evaporated salt ore are subjected to solid-liquid separation to obtain 27.5kg of second solid-phase salt ore and 13.4kg of second liquid-phase brine.

[0075] S303 Cooling for the first time: place the second liquid-phase brine ...

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Abstract

The invention relates to a method for enriching lithium in carbonate type salt lake brine, which comprises the following steps of: alternately performing low-temperature evaporation and freezing placing treatment on the salt lake brine; and after each evaporation or placing treatment, performing solid-liquid separation to remove solid-phase salt mine to obtain Li<+>-enriched liquid-phase brine. According to the method provided by the invention, lithium ions are enriched in the liquid-phase brine by a variable-temperature evaporation method; the method can make use of natural energy and has the advantages of environmental friendliness and low energy consumption; and the concentration of the enriched lithium ions can exceed 30g / L.

Description

【Technical field】 [0001] The invention relates to the field of salt lake brine utilization, in particular to a method for enriching lithium from carbonate-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, mainly concentrated in Zabuye Salt Lake in the west of northern Tibet and Bangor-Dujia Lithium Lake in the east. The lithium resources are respectively Accounting for 8.37 million tons and 500,000 tons. The salt lake resources in Tibet mainly exist in liquid brine, and lithium ions are mainly converted to KLiSO after evaporation by natural sunlight. 4 , NaLiSO 4 、3Li 2 SO 4 ·H 2 The O form exists. [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 evapo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/00C01D3/06C01D5/00
Inventor 张志宏马艳芳董生发付振海赵景顺王国富
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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