Method for deeply removing fluorine from LiHCO3 solution recycled and leached from waste lithium batteries
A technology for used lithium batteries and used batteries, applied in battery recycling, waste collector recycling, recycling technology and other directions, can solve problems such as poor defluorination effect, affecting the quality of battery-grade lithium carbonate, and inability to achieve deep defluorination. Avoid the effect of decomposition
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Embodiment 1
[0019] A. Raw material preparation: LiHCO obtained by carbonizing and pre-impregnating 1L waste battery material 3 Solution, the measured fluoride ion content is 110ppm, according to LiHCO 3 Add 15% defluoridation agent to the solution volume, that is, 1000mLLiHCO 3 Add 150g of fluoride removal agent to the solution. The defluoride agent is CF-2000 defluoride agent produced by Changsha Huasheng New Material Technology Co., Ltd.
[0020] B. Alkaline washing with fluoride removal agent: add 2% NaOH solution to the fluoride removal agent according to the solid-to-liquid ratio of 1:2, mix and stir for 0.5h, then filter to obtain the fluoride removal agent for eluted sulfate or chloride ions.
[0021] C. Adjust the pH of the system: add the washed defluorinating agent to LiHCO 3 solution, through CO 2 Adjust the pH of the system to 7.25.
[0022] D. LiHCO 3 Solution defluorination: Stir for 1 hour while blowing air, vacuum filter to obtain fluorine-containing residue and LiHC...
Embodiment 2
[0026] A. Raw material preparation: LiHCO obtained by carbonizing and pre-impregnating 1L waste battery material 3 Solution, the measured fluoride ion content is 88.5ppm, according to LiHCO 3 Add 10% defluoridation agent to the solution volume, that is, 1000mLLiHCO 3 Add 100g of fluoride removal agent to the solution. The defluoride agent is CF-2000 defluoride agent produced by Changsha Huasheng New Material Technology Co., Ltd.
[0027] B. Alkaline washing with fluoride removal agent: add 2% NaOH solution to the fluoride removal agent according to the solid-to-liquid ratio of 1:3, mix and stir for 0.5h, and then filter to obtain the fluoride elution sulfate or chloride ion defluorination agent.
[0028] C. Adjust the pH of the system: add the washed defluorinating agent to LiHCO 3 solution, through CO 2 Adjust the pH of the system to 7.32.
[0029] D. LiHCO 3 Solution defluorination: Stir for 1 hour while blowing air, vacuum filter to obtain fluorine-containing residue ...
Embodiment 3
[0033] A. Raw material preparation: LiHCO obtained by carbonizing and pre-impregnating 1L waste battery material 3 Solution, the measured fluoride ion content is 88.5ppm, according to LiHCO 3 Add 5% defluoridation agent to the volume of the solution, that is, 1000mLLiHCO 3 Add 50g of fluoride removal agent to the solution. The defluoride agent is CF-2000 defluoride agent produced by Changsha Huasheng New Material Technology Co., Ltd.
[0034] B. Alkaline washing with fluoride removal agent: add 2% NaOH solution to the fluoride removal agent according to the solid-to-liquid ratio of 1:4, mix and stir for 0.5h, then filter to obtain the fluoride removal agent for eluted sulfate or chloride ions.
[0035]C. Adjust the pH of the system: add the washed defluorinating agent to LiHCO 3 solution, through CO 2 Adjust the pH of the system to 7.62.
[0036] D. LiHCO 3 Solution defluorination: Stir for 1 hour while blowing air, vacuum filter to obtain fluorine-containing residue and...
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