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A kind of recovery method of monohydrate lithium hydroxide metal impurity exceeding standard

A technology of monohydrate lithium hydroxide and metal impurities, applied in the directions of lithium oxide;/hydroxide, chemical instruments and methods, solid separation, etc. The effect of recycling rate and cost reduction

Active Publication Date: 2022-05-06
JIANGSU BAOZONG & BAODA PHARMACHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the process of producing lithium hydroxide monohydrate, the magnetic foreign matter must pass through the metal iron remover. However, there will be a lot of powder with excessive metal impurities (containing about 2500ppb magnetic foreign matter) in the iron remover. Many manufacturers will treat these The materials are processed in barrels, but through this processing method, the materials can only be collected and processed, and cannot be used as resources

Method used

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  • A kind of recovery method of monohydrate lithium hydroxide metal impurity exceeding standard
  • A kind of recovery method of monohydrate lithium hydroxide metal impurity exceeding standard

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Dissolve 100g of powder in 500g of purified water, raise the temperature to 90°C-95°C, keep it warm for 2 hours, and then filter through the first filter 7 with a pressure of 100-300KPa. After one filtration, the foreign matter in the solution is reduced to 1200ppb. Then pass through the first fluid iron remover 8 at a flow rate of 0.5-0.7m / s, and reduce it to 410ppb, and then filter through the second filter 10 with a filter pressure of 20-30KPa, and then filter at a flow rate of 0.6-0.7m / s Sent to the second fluid iron remover 11, the foreign matter in the solution can be reduced to 150ppb, and the solution is cooled and crystallized to obtain 64g of lithium hydroxide monohydrate.

Embodiment 2

[0047] Dissolve 100g of powder in 500g of purified water, heat up to 95°C-100°C, keep warm and reflux for 2 hours, then filter through the first filter 7 with a pressure of 100-300KPa. After one filtration, the foreign matter in the solution is reduced to 1000ppb , and then pass through the first fluid iron remover 8 at a flow rate of 0.5-0.7m / s, down to 300ppb, and then filter through the second filter 10 with a filter pressure of 20-30KPa, and then filter with a flow rate of 0.6-0.7m / s The flow rate is sent to the second fluid iron remover 11, the foreign matter in the solution can be reduced to 70ppb, and the solution is cooled and crystallized to obtain 56g of lithium hydroxide monohydrate.

Embodiment 3

[0049] Dissolve 100g of powder in 600g of purified water, heat up to 95°C-100°C, keep warm and reflux for 2 hours, then filter through the first filter 7 with a pressure of 100-300KPa. After one filtration, the foreign matter in the solution is reduced to 960ppb , and then pass through the first fluid iron remover 8 at a flow rate of 0.5-0.7m / s to reduce to 280ppb, and then filter through the second filter 10 with a filter pressure of 20-30KPa, and then filter with a flow rate of 0.6-0.7m / s The flow rate is sent to the second fluid iron remover 11, the foreign matter in the solution can be reduced to 50ppb, and the solution is cooled and crystallized to obtain 55g of lithium hydroxide monohydrate.

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Abstract

The invention relates to a recovery system and a recovery method for lithium hydroxide monohydrate metal impurities exceeding the standard, including an electromagnetic separator, a material gas separator, a storage bin, a dissolution kettle, a first intermediate tank, a clarification tank, a first filter device, the first fluid iron remover, the second intermediate tank, the second filter and the second fluid iron remover. The advantage of the present invention is that: the present invention removes iron through the electromagnetic iron remover first, then dissolves with water to form a solution, and then passes through the first filter, the first fluid iron remover, the second filter and the second fluid iron remover in sequence Remove iron to reduce the magnetic foreign matter in the solution to 45ppb-150ppb, and then obtain lithium hydroxide monohydrate through cooling and crystallization, without adding any other auxiliary agents, safe and non-toxic, simple to operate, safe and environmentally friendly, and effectively improve the recovery of lithium The utilization rate reduces the cost while solving the problem of magnetic foreign matter stacking, and can effectively utilize resources reasonably.

Description

technical field [0001] The invention belongs to the technical field of lithium hydroxide preparation, in particular to a method for recovering lithium hydroxide monohydrate metal impurities exceeding the standard. Background technique [0002] Lithium hydroxide monohydrate is mainly used in the preparation of lithium-based lubricating grease and electrolyte additives for alkaline batteries, and it is also used in petrochemical and glass ceramic industries. Lithium battery companies have set off a wave of expansion of ternary batteries, which has led to a sharp rise in ternary materials. Changes in terminal demand have forced the development of the lithium battery industry chain. Lithium battery companies have set off a wave of expansion of ternary batteries, which has driven price changes in the four major upstream materials. International mainstream lithium battery manufacturers are gradually transforming to ternary materials. In order to improve the energy density, terna...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D15/02B03C1/30B03C1/02
CPCC01D15/02B03C1/02B03C1/30
Inventor 陈荣姚胜宇李丰
Owner JIANGSU BAOZONG & BAODA PHARMACHEM