A kind of pre-enrichment extraction system and pre-enrichment method of potassium and lithium in brine
A pre-concentration and brine technology, applied in the field of potassium and lithium pre-concentration, potassium and lithium pre-concentration extraction system in salt lake brine, can solve problems such as potassium and lithium loss, and achieve low energy consumption and good economy. Benefit and social benefit, the effect of low production cost
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Embodiment 1
[0041] A kind of pre-enrichment method of potassium and lithium in salt lake brine, first press C 2 h 4 Cl 2 The volume ratio of ILs and ILs is 9:1 to prepare the solvent, and then add an appropriate amount of DB18C6 to the above solvent, so that the molar concentration of DB18C6 extractant is 0.2mol / L. Then, 0.2 mol / L DB18C6 organic extractant was extracted and reacted with brine, and the extracted oil phase was collected; the raffinate was extracted 1-2 times according to the above steps, and the raffinate was collected. All the oily phases were collected, mixed with 2mol / L ammonium nitrate solution, and stripped to obtain stripped raffinate and oily phase. Table 1 is the result of DB18C6 extracting the simulated brine of the salt lake, and Table 2 is the result of DB18C6 extracting the real brine of the salt lake.
[0042] Table 1. DB18C6 extraction results of salt lake simulated brine
[0043]
[0044]Table 2. Results of DB18C6 extraction of real brine from salt lak...
Embodiment 2
[0049] A kind of pre-enrichment method of potassium and lithium in salt lake brine, first press C 2 h 4 Cl 2 Prepare the solvent with a volume ratio of 5:1 to ILs, and then add an appropriate amount of DB18C6 to the above solvent to make the molar concentration of DB18C6 extractant 0.5mol / L. Then, 0.5 mol / L DB18C6 organic extractant was extracted and reacted with brine, and the extracted oil phase was collected; the raffinate was extracted 1-2 times according to the above steps, and the raffinate was collected. All the oily phases were collected, mixed with 3mol / L ammonium nitrate solution, and stripped to obtain stripped raffinate and oily phase.
Embodiment 3
[0051] A kind of pre-enrichment method of potassium and lithium in salt lake brine, first press C 2 h 4 Cl 2 Prepare the solvent with a volume ratio of 2:1 to ILs, and then add an appropriate amount of DB18C6 to the above solvent to make the molar concentration of DB18C6 extractant 0.05mol / L. Then, 0.05 mol / L DB18C6 organic extractant was extracted and reacted with brine, and the extracted oil phase was collected; the raffinate was extracted 1-2 times according to the above steps, and the raffinate was collected. All the oily phases were collected, mixed with 2.5mol / L ammonium nitrate solution, and stripped to obtain stripped raffinate and oily phase.
[0052] In addition, the inventors of this case also used the other process conditions listed above to replace the corresponding process conditions in Examples 1-3 and carried out corresponding tests, and the content to be verified was similar to that of the products in Examples 1-3. Therefore, the verification content of eac...
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