Method for improving yield of Li<+> in sodium sulfate subtype salt lake brine

A technology of salt lake brine and sodium sulfate, applied in water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc. The effect of improving the yield, reducing the hindering effect, and improving the separation effect

Active Publication Date: 2021-05-28
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The existing technology mainly improves the yield of lithium through multi-stage nanofiltration, and the more stages of nanofiltration, the greater the investment in membrane equipment and the larger the floor area. With the corresponding increase in energy unit consumption, it is affected by the nanofiltration process. effect, when the number of nanofiltration stages reaches a certain value, the effect of improving the yield is not obvious
In addition, SO in the sodium sulfate subtype salt lake brine system 4 2- The content is very high, affected by the Taonan effect, when lithium is extracted by nanofiltration method, Li + low yield

Method used

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  • Method for improving yield of Li&lt;+&gt; in sodium sulfate subtype salt lake brine

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Effect test

Embodiment 1

[0038] The sodium sulfate subtype salt lake brine in Tibet was used as raw material to extract lithium by nanofiltration. The main components are as follows: Li + : 0.239g / L, Mg 2+ : 0.786g / L, Na + : 15.066g / L, Cl - : 12.27g / L, SO 4 2- : 18.8g / L. Take 20L of the above-mentioned brine as a raw material, adopt 1812 nanofiltration separation equipment produced by Xiamen Fumei Technology Co., Ltd., the nanofiltration membrane is Dow DK2540F30, the nanofiltration pressure is 40bar, and the volume ratio of nanofiltration permeate and concentrate at all levels is 3 : 1, after the end of the primary nanofiltration process, MgCl 2 as Cl - Introduce the source, introduce Cl in the concentrate - , dilute the concentrate twice with RO water, introduce Cl - And the Cl in the diluted concentrate - The concentration is 10g / L (you can also introduce Cl after dilution - ; The effect of dilution is mainly to reduce the concentration of the total salt content in the solution, and the c...

Embodiment 2

[0040] The sodium sulfate subtype salt lake brine in Tibet was used as raw material to extract lithium by nanofiltration. The main components are as follows: Li + : 0.239g / L, Mg 2+ : 0.786g / L, Na + : 15.066g / L, Cl - : 12.27g / L, SO 4 2- : 18.8g / L. Take 20L of the above-mentioned brine as a raw material, adopt 1812 nanofiltration separation equipment produced by Xiamen Fumei Technology Co., Ltd., the nanofiltration membrane is Dow DK2540F30, the nanofiltration pressure is 40bar, and the volume ratio of nanofiltration permeate and concentrate at all levels is 3 : 1, NaCl is used as Cl after the end of the primary nanofiltration process - Introduce the source,, introduce Cl in the concentrate - , dilute the concentrate twice with RO water, introduce Cl - And the Cl in the diluted concentrate - Concentration is 10g / L, above-mentioned introduced Cl - And the diluted concentrated solution is subjected to secondary nanofiltration. After the secondary nanofiltration, the prima...

Embodiment 3

[0042] The sodium sulfate subtype salt lake brine in Tibet was used as raw material to extract lithium by nanofiltration. The main components are as follows: Li + : 0.239g / L; Mg 2+ : 0.786g / L, Na + : 15.066g / L, Cl - : 12.27g / L, SO 4 2- : 18.8g / L. Take 20L of the above-mentioned brine as a raw material, adopt 1812 nanofiltration separation equipment produced by Xiamen Fumei Technology Co., Ltd., the nanofiltration membrane is Dow DK2540F30, the nanofiltration pressure is 40bar, and the volume ratio of nanofiltration permeate and concentrate at all levels is 3 : 1, with MgCl 2 as Cl - Introduce the source, and introduce the concentration of Cl in the raw brine as 5g / L - , introducing Cl - The final raw material brine is subjected to primary nanofiltration, and Cl is continuously introduced into the primary concentrate obtained in the primary nanofiltration process. - , dilute the primary concentrated solution by 2 times with RO water, and introduce Cl - And dilute Cl i...

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Abstract

The invention discloses a method for increasing the yield of Li<+> in sodium sulfate subtype salt lake brine, which comprises the following steps: adding Cl<-> into the sodium sulfate subtype salt lake brine to obtain pretreated brine; and subjecting the pretreated brine to nanofiltration, so as to obtain permeate liquid which is lithium-rich permeate liquid. In the sodium sulfate subtype salt lake brine, the Li<+> content is 0.15-3g / L, the pH value is 7.5-11, the SO4<2-> ion content is greater than or equal to 10g / L, and the magnesium-lithium ratio is greater than or equal to 2:1. According to the method, after Cl<-> is introduced, the yield of two-stage nanofiltration Li<+> can reach 70% or above, the number of nanofiltration stages needed for achieving the same yield is small, and corresponding investment is small; and in order to further improve the yield of lithium in the nanofiltration process, the nanofiltration stage number can be increased, and the yield is higher than that in the prior art under the same nanofiltration stage number.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemistry, and in particular relates to a method for increasing Li in sodium sulfate subtype salt lake brine. + yield method. Background technique [0002] Lithium, as an important energy metal, is widely used in new energy, medicine, aerospace, refrigerants and other fields. High-tech products prepared with lithium as raw materials have penetrated into people's daily life. With the increasing demand for lithium salt products in countries around the world, especially for LiOH and Li 2 CO 3 The demand for raw materials such as lithium salt continues to rise. [0003] my country's lithium resources are mainly distributed in the salt lakes of Qinghai and Tibet. With the breakthrough of the technical bottleneck of lithium extraction from salt lakes, lithium resources in salt lake brines have been effectively developed. The current methods for extracting lithium from salt lake brines mainly includ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44C01D15/00
CPCC02F1/442C01D15/00
Inventor 张世春张志宏王婧俞学山李成宝马艳芳
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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