Method for extracting lithium ions
A technology for extracting lithium and ions, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve problems such as inability to achieve selective adsorption, and achieve good application prospects, cost reduction, and good cycle stability.
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Embodiment 1
[0042] A method for extracting lithium ions, comprising the steps of:
[0043] (1) Preparation of MCDI electrodes
[0044] Activated carbon is used as the electrode active material, conductive carbon black is used as the conductive agent, and polyvinylidene fluoride (PVDF) is used as the binder. After the three are mixed at a mass ratio of 8:1:1, N-methylpyrrolidone ( NMP) solution was repeatedly ground into a homogeneous slurry. Spread it evenly over 5×5 cm 2 On the graphite sheet, the electrode was vacuum-dried at 60°C for 12 hours to remove the solvent, and the mass of the obtained activated carbon electrode was loaded about 60 mg;
[0045] (2) MCDI test
[0046] the instrument as figure 1 Assembly, the electrode made of activated carbon is assembled as shown in the figure, the ordinary anion membrane is close to the surface of the positive electrode, and the monovalent selective cation membrane (CIMS) is close to the surface of the negative electrode, and another 50ml ...
Embodiment 2
[0051] A method for extracting lithium ions, comprising the steps of:
[0052] The operation steps in the above-mentioned Example 1 were unchanged, and the CDI negative electrode was covered with CIMS, CSO, polyethylene heterogeneous ion exchange membrane type 1 (ordinary cation exchange membrane), and experiments were carried out respectively. CIMS thickness is 150µm, sheet resistance is 1.8Ωcm 2 , use pH 0-10; CSO thickness is 100µm, surface resistance is 2.3Ωcm 2 , The migration number is greater than 97%. Because the body of this type of membrane is charged, the rejection rate of monovalent ions is low, and the rejection rate of divalent ions is high, which can realize the separation of monovalent ions and divalent ions. Polyethylene heterogeneous ion exchange membrane type 1 has a thickness of 0.42mm and a surface resistance of 11Ωcm 2 , with a strongly acidic group R - SO 3- A negative electric field is formed, and positively charged ions are easily absorbed and pass...
Embodiment 3
[0054] A method for extracting lithium ions, comprising the steps of:
[0055] The operating steps in the above-mentioned embodiment 1 are unchanged, and the feed liquid components are changed to LiCl, MgCl 2 , LiCl / MgCl 2 , where LiCl, MgCl 2 The concentration in each solution is 250mg / L, and two monovalent selective cation exchange membranes, CIMS and CSO, are tested respectively.
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