A method of recovering and utilizing salt lake lithium extraction mother liquor and producing a by-product basic magnesium carbonate
A technology for extracting lithium mother liquor and lithium mother liquor from salt lakes, which is applied in the direction of lithium carbonate; Benefits and economic benefits, the effect of improving recycling rate and reducing production cost
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Embodiment 1
[0028] (1) Lithium Extraction Mother Liquor 1 is the tail liquid produced in the separation process of magnesium and lithium in brine with a high magnesium-lithium ratio raw material. The contents of lithium and magnesium in the tail liquid are respectively: Li + The content is 0.6g / L, Mg 2+ The content is 38g / L, and the mother liquor 2 is the tail liquid produced in the conversion lithium precipitation process, which contains 2.2g / L Li + In addition to ions, it also contains 15g / L of CO 3 2- ions and 80g / L NaCl, the temperature of mother liquor 1 is between 25°C and the temperature of mother liquor 2 is between 85°C, mix mother liquor 2 and mother liquor 1 at a ratio of 6:1, and the temperature of the solution after mixing is between 50°C , after mixing, stir the reaction for 25 minutes, CO in the mother liquor 1 3 2- Ions and Mg in Mother Liquor II 2+ Basic magnesium carbonate is formed, and crude basic magnesium carbonate is obtained after pressure filtration and separ...
Embodiment 2
[0033] (1) Lithium Extraction Mother Liquor 1 is the tail liquid produced in the separation process of magnesium and lithium in brine with a high magnesium-lithium ratio raw material. The contents of lithium and magnesium in the tail liquid are respectively: Li + The content is 0.7g / L, Mg 2+ The content is 43g / L, and the mother liquor 2 is the tail liquid produced in the conversion lithium precipitation process, which contains 2.0g / L Li + In addition to ions, it also contains 17g / L of CO 3 2- ions and 90g / L NaCl, the temperature of mother liquor 1 is 30°C, the temperature of mother liquor 2 is 90°C, mix mother liquor 2 and mother liquor 1 at a ratio of 5:1, the temperature of the solution after mixing is 55°C, stir and react for 25 minutes, CO in mother liquor 3 2- Ions and Mg in Mother Liquor II 2+ Basic magnesium carbonate is formed, and crude basic magnesium carbonate is obtained after pressure filtration and separation, and the mother liquor needs to be further proces...
Embodiment 3
[0038] (1) Lithium Extraction Mother Liquor 1 is the tail liquid produced in the separation process of magnesium and lithium in brine with a high magnesium-lithium ratio raw material. The contents of lithium and magnesium in the tail liquid are respectively: Li + The content is 0.8g / L, Mg 2+ The content is 48g / L, and the mother liquor 2 is the tail liquid produced in the conversion lithium precipitation process, which contains 1.8g / L Li + In addition to ions, it also contains 20g / L CO 3 2- ions and 100g / L NaCl, the temperature of mother liquor 1 is 35°C, the temperature of mother liquor 2 is 95°C, mix mother liquor 2 and mother liquor 1 at a ratio of 4:1, the temperature of the solution after mixing is 60°C, stir and react for 25 minutes, CO in mother liquor 3 2- Ions and Mg in Mother Liquor II 2+ Basic magnesium carbonate is formed, and crude basic magnesium carbonate is obtained after pressure filtration and separation, and the mother liquor needs to be further processe...
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