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Battery-grade high-purity lithium fluoride and preparation method thereof

A high-purity lithium fluoride, battery-grade technology, applied in lithium halide and other directions, can solve the problem that the preparation method cannot meet production requirements, and achieve the effect of reducing production costs and ensuring purity

Active Publication Date: 2013-12-18
XINJIANG RES INST OF NON FERROUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a battery-grade high-purity lithium fluoride and its preparation method, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problem of existing battery-grade lithium fluoride. The commonly used preparation methods of high-purity lithium fluoride can no longer meet the existing production needs

Method used

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  • Battery-grade high-purity lithium fluoride and preparation method thereof

Examples

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Embodiment 1

[0013] Example 1, the battery-grade high-purity lithium fluoride is obtained by the following method: adding battery-grade lithium hydroxide monohydrate to deionized water to form a lithium hydroxide solution containing 25 g / L to 30 g / L of lithium , add hydrofluoric acid to the lithium hydroxide solution to react and adjust the pH value of the solution to 6 to 7.5, and then carry out solid-liquid separation after standing for 10 to 30 minutes, and add 2 times the volume of the solid phase to the separated solid phase Wash with 4 times deionized water for 3 times, and dry the washed solid phase until the water content in the solid phase is less than 0.03% by mass to obtain battery-grade high-purity lithium fluoride.

Embodiment 2

[0014] Example 2, the battery-grade high-purity lithium fluoride is obtained by the following method: adding battery-grade lithium hydroxide monohydrate to deionized water to form a lithium hydroxide solution containing 25 g / L or 30 g / L of lithium , add hydrofluoric acid to the lithium hydroxide solution to react and adjust the pH value of the solution to 6 or 7.5, and then carry out solid-liquid separation after standing for 10 minutes or 30 minutes, and add 2 times the volume of the solid phase to the separated solid phase Or wash with 4 times deionized water for 3 times, and dry the washed solid phase until the mass percent water content in the solid phase is less than 0.03%, to obtain battery-grade high-purity lithium fluoride.

Embodiment 3

[0015] Embodiment 3, as the optimization of the above-mentioned embodiment, battery-grade lithium hydroxide monohydrate in embodiment 3 is carried out according to the following method: add industrial-grade lithium hydroxide monohydrate to deionized water and be made into containing lithium 25 grams / liter to 30 gram / liter lithium hydroxide solution, add impurity remover in lithium hydroxide solution and stir evenly, the add-on of impurity remover is to add 14 grams to 120 gram impurity remover in every 100 liters of lithium hydroxide solution, then carry out Solid-liquid separation, the separated filtered liquid is heated, evaporated, concentrated and crystallized until the volume ratio of crystal phase and liquid phase is 2:1 to 3:1; then solid-liquid separation is carried out, and the solid phase is battery-grade lithium hydroxide monohydrate.

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Abstract

The invention relates to the technical field of lithium fluoride and discloses battery-grade high-purity lithium fluoride and a preparation method thereof. The preparation method of the battery-grade high-purity lithium fluoride comprise the following steps: adding battery-grade lithium hydorxide monohydrate into deionized water to prepare into a lithium hydroxide solution with lithium content of 25g / L-30g / L, adding hydrofluoric acid into the lithium hydroxide solution and reacting, adjusting the pH value of the solution to be 6-7.5, standing for 10-30 minutes and then performing solid-liquid separation, adding the deionized water accounting for 2-4 times of the solid phase volume into the separated solid phase, washing for 3 times, and drying the washed solid phase till the water content of the solid phase in mass percentage is less than 0.03% to obtain battery-grade high-purity lithium fluoride. By taking industrial-grade lithium hydroxide monohydrate as the raw material, the battery-grade lithium hydroxide monohydrate is obtained by purifying, so that the purity of a battery-grade high-purity lithium fluoride product is ensured; mother liquor and washing liquor in a preparation process are recyclable, so that the production cost is greatly lowered.

Description

technical field [0001] The invention relates to the technical field of lithium fluoride, and relates to battery-grade high-purity lithium fluoride and a preparation method thereof. Background technique [0002] Lithium fluoride is an important chemical reagent that can be used in enamel, glass, ceramics and other industrial fields. With the development of lithium battery technology in recent years, it has become a necessary raw material for the preparation of lithium hexafluorophosphate, a commonly used electrolyte for lithium ion batteries. Therefore, the preparation of lithium hexafluorophosphate needs to meet the high-purity lithium fluoride that meets the requirements of the battery. Not only does it have relatively strict requirements for impurities, but the main content also needs to reach 99.95%. The commonly used preparation methods of battery-grade high-purity lithium fluoride include ion exchange method, extraction method, direct reaction method of high-purity lith...

Claims

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Application Information

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IPC IPC(8): C01D15/04
Inventor 支红军唐向阳刘力宋磊刘慧舟
Owner XINJIANG RES INST OF NON FERROUS METALS