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Method for extracting lithium from salt lake and brine

A technology of brine and lithium precipitation mother liquor, applied in the direction of improving process efficiency, etc., to achieve the effect of reducing investment cost, reducing the use of chemicals, and simple operation

Pending Publication Date: 2022-04-22
HENGXINGRUNFENG TECH DEV BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for extracting lithium from salt lakes and brines, which realizes efficient and energy-saving removal of high-valent ion impurities such as magnesium, calcium, boron, iron, silicon oxide and other impurities in salt lakes and brines, and solves the problem of traditional methods. The technical problems of complicated steps, high cost and high energy consumption, high efficiency and energy saving, greatly improve the efficiency of lithium extraction in salt lakes of enterprises, and reduce unit production costs at the same time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1 removes impurity Mg 2+ ion

[0041] 11): Before entering the front reaction tank, add excess sodium hydroxide solution (or other alkaline substances, such as lime, etc.) actual situation adjustment), fully stirred the reaction to make the Mg in the stock solution 2+ Ions form Mg(OH) 2 precipitation;

[0042] 12): The produced water is pressurized by the booster pump and then sent to the membrane filter. The filter system is automatically controlled by PLC, and the normal operating pressure is <0.04MPa. The separation membrane can effectively intercept magnesium hydroxide colloidal flocs, and the sediment is blocked on the surface of the filter membrane. When the filter cake thickens and the filtration pressure difference increases to the set value, backwashing is performed to push the precipitated impurities away from the membrane surface and sink to the bottom of the filter, and then discharged to the downstream process.

[0043] The high valence ions...

Embodiment 2

[0044] Embodiment 2 removes boron ions after removing high-valent ions

[0045] 11): Before entering the front reaction tank, add excess sodium hydroxide solution (or other alkaline substances, such as lime, etc.) actual situation adjustment), fully stirred the reaction to make the Mg in the stock solution 2+ Ions form Mg(OH) 2 precipitation;

[0046] 12): The produced water is pressurized by the booster pump and then sent to the membrane filter. The filter system is automatically controlled by PLC, and the normal operating pressure is <0.04MPa. The separation membrane can effectively intercept magnesium hydroxide colloidal flocs, and the sediment is blocked on the surface of the filter membrane. When the filter cake thickens and the filtration pressure difference increases to the set value, backwashing is performed to push the precipitated impurities away from the membrane surface and sink to the bottom of the filter, and then discharged to the downstream process.

[0047...

Embodiment 3

[0051] The membrane recovery method of embodiment 3 heavy lithium mother liquor

[0052] 1) In the high-lithium solution after the impurity removal process, add Na 2 CO 3 , so that it is fully overreacted, lithium precipitation reaction occurs, and lithium carbonate wet crystals and lithium precipitation mother liquor are generated.

[0053] 2) The lithium precipitation mother liquor obtained by the reaction is pressurized by a booster pump and then sent to a membrane filter. The filter system is automatically controlled by PLC, and the normal operating pressure is less than 0.04MPa. After filtration, high-purity lithium carbonate is obtained, SS<0.5mg / L. The filter residue is returned and merged into the high-lithium solution pipeline for cyclic lithium precipitation reaction and the next recovery process. The total amount of filter residue is not more than 5% of the total treated water, and the solid content is much higher than that of commonly used ultrafiltration membran...

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Abstract

The invention discloses a method for extracting lithium from a salt lake and brine, which comprises the following steps: 1) separation of high-valence ion impurities: adding strong base or acid into the salt lake and the brine according to the water quality condition of the salt lake and the brine to adjust the pH value so as to generate insoluble substances, separating through a separation membrane, and collecting filtrate, namely a high-lithium solution; 2) recovery of lithium precipitation mother liquor: adding fully excessive Na2CO3 into the high-lithium solution in the step 1) to carry out lithium precipitation reaction, and collecting filtrate, namely the lithium precipitation mother liquor; and separating and recycling the lithium precipitation mother liquor through a separation membrane. The method for extracting the lithium from the salt lake and the brine is simple in structure and feasible in function, the process is greatly simplified, and a control system adopts full-automatic control; energy is saved, the water content of filter residues is low, and zero emission can be achieved according to technological requirements; the investment cost is reduced after the process is simplified; the system is low in operation pressure and low in operation cost, and agent use is reduced; operation is simple, and the production period is short.

Description

technical field [0001] The invention relates to the technical field of separation and extraction, in particular to a method for extracting lithium from salt lakes and brines. Background technique [0002] The main raw material sources of lithium salt can be divided into lithium ore, high lithium salt lake and brine. In the early days, solid ore was mainly used to extract lithium in my country, but with the reduction of high-grade lithium ore and the continuous increase of production costs, lithium extraction from salt lakes and brines has gradually attracted people's attention. The use of salt lake and brine lithium extraction technology can make comprehensive utilization of salt lake and brine resources. Salt lakes and brines are the largest incremental sources of lithium supply in the future. In the face of limited reserves of lithium-rich ore resources and strong market demand, it is imperative to develop and extract lithium resources in salt lakes and brines with abunda...

Claims

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Application Information

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IPC IPC(8): C22B26/12C22B3/02C22B3/22C22B3/44
CPCC22B26/12C22B3/02C22B3/44C22B3/22Y02P10/20
Inventor 李晓明张天国施仲元侯媛媛
Owner HENGXINGRUNFENG TECH DEV BEIJING
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