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
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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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