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High-purity lithium hexafluorophosphate continuous dynamic crystallization process device and method

A technology of lithium hexafluorophosphate and a process method, which is applied in the field of high-purity lithium hexafluorophosphate continuous dynamic crystallization process devices, can solve problems such as inability to meet production processes, and achieve the effects of reducing frequent manual operations, ensuring product quality, and improving cooling rate.

Pending Publication Date: 2022-07-26
西安航天华威化工生物工程有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The original static batch crystallization process cannot meet the needs of the production process, and the company urgently needs a new crystallization production process to solve the problem of production expansion

Method used

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  • High-purity lithium hexafluorophosphate continuous dynamic crystallization process device and method

Examples

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Comparison scheme
Effect test

Embodiment 1

[0037] This example is used to illustrate the lithium hexafluorophosphate crystal provided by the present invention and its production method.

[0038]The lithium hexafluorophosphate raw material liquid with a concentration of 19% and a temperature of 15 °C is pumped into the primary crystallization circulation pipeline by the raw material pump for cooling and cooling, and the temperature difference between the primary circulating feed liquid and the cooling medium is kept at 2 °C, and the circulation amount is 2 °C of the feeding amount. 50 times, maintain the temperature of the lithium hexafluorophosphate liquid in the first-stage crystallizer at -21 °C, keep the solid content of the crystal slurry in the first-stage crystallizer at 5%, circulate and cool in the crystallizer for 2 hours, and pump it into the second-stage through the first-stage discharge pump. The crystallization system is further cooled and cooled, the temperature difference between the secondary circulating...

Embodiment 2

[0040] The lithium hexafluorophosphate raw material liquid with a concentration of 15% and a temperature of 10 °C is pumped into the primary crystallization circulation pipeline by the raw material pump for cooling and cooling, and the temperature difference between the primary circulating feed liquid and the cooling medium is kept at 1 °C, and the circulation amount is 1 °C of the feeding amount. 80 times, maintain the temperature of the lithium hexafluorophosphate liquid in the first-stage crystallizer at -18 °C, and keep the solid content of the crystal slurry in the first-stage crystallizer at 8%. The crystallization system was further cooled to keep the temperature difference between the secondary circulating feed liquid and the cooling medium at 3 °C, the circulation amount was 60 times the feed amount, the temperature of the lithium hexafluorophosphate feed liquid in the secondary crystallizer was maintained at -42 °C, and the secondary crystallizer was kept at a temperat...

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Abstract

The invention relates to a continuous dynamic crystallization process device and method for high-purity lithium hexafluorophosphate, and aims to solve the problems that the existing crystallization process for producing lithium hexafluorophosphate is generally intermittent static process equipment, the product quality is greatly influenced by batches, secondary crushing is needed, the crystallization time is as long as 30-60 hours, and the production investment and cost are very high. The method comprises the following steps: pumping a raw material solution into a primary crystallization circulation system, carrying out cooling crystallization under the action of a primary circulation pump, pumping the raw material solution into a secondary crystallization circulation system after crystal transformation is completed, and carrying out further cooling crystallization under the action of a secondary circulation pump to obtain lithium hexafluorophosphate slurry; and discharging the obtained lithium hexafluorophosphate slurry through a secondary discharging pump, feeding the lithium hexafluorophosphate slurry to a crystal slurry buffer tank for buffer storage, and then inputting the lithium hexafluorophosphate slurry into a filter for solid-liquid separation. The invention has the advantages of continuous feeding and discharging, stable and continuous product quality, high purity, uniform particle size distribution, greatly shortened crystallization time, and greatly reduced production investment and cost.

Description

technical field [0001] The invention belongs to the technical field of electrolyte lithium hexafluorophosphate crystallization in the lithium battery industry, and particularly relates to a high-purity lithium hexafluorophosphate continuous dynamic crystallization process device and method. Background technique [0002] Lithium-ion batteries are composed of four major materials: positive electrode, negative electrode, electrolyte, and diaphragm. The cost of electrolyte accounts for about 5%-10%, which is one of the main key raw materials for lithium-ion batteries. The lithium battery electrolyte is synthesized from lithium salts, solvents, etc., lithium hexafluorophosphate (LiPF 6 ) is the main raw material for the manufacture of lithium-ion battery electrolytes, and is currently the most commonly used electrolyte lithium salt due to its good ionic conductivity and electrochemical stability. [0003] At present, the main process for producing lithium hexafluorophosphate is ...

Claims

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Application Information

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IPC IPC(8): B01D9/02
CPCB01D9/0013B01D9/004B01D9/0059
Inventor 上官菲菲杨鹏刘胜王国磊成栋沈战胜鲁鹏涛蒲姣姣吴坚李然刘建锋邰向阳
Owner 西安航天华威化工生物工程有限公司
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