Process for preparing lithium silicate from lithium fluoride waste

A lithium fluoride, lithium silicate technology, applied in silicate, alkali metal silicate, calcium/strontium/barium fluoride, etc., can solve the problems of low modulus, poor adhesion, and high raw material prices

Pending Publication Date: 2021-02-09
河南省氟基新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The wet process uses silica sol and lithium hydroxide monohydrate to synthesize or use lithium sulfate ion exchange to prepare lithium silicate aqueous solution. The main problem is that the modulus is low, and there are disadvantages such as poor adhesion and poor water resistance. Active silicic acid- Lithium hydroxide uses water glass solution as a raw material, prepares active silicic acid solution by cation exchange method, and then reacts with lithium hydroxide to obtain lithium silicate solution. This method overcomes the shortcomings of the above two processes and prepares a transparent, Lithium silicate aqueous solution with strong cohesive force, but this aqueous solution is not suitable for long-distance transportation, and the price of raw materials is high, resulting in high product cost

Method used

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  • Process for preparing lithium silicate from lithium fluoride waste
  • Process for preparing lithium silicate from lithium fluoride waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A kind of technology that utilizes lithium fluoride waste material to prepare lithium silicate, specifically comprises the following steps:

[0036] 1) Take 10kg of lithium fluoride waste, wash with water and dry to remove attached organic matter, drying at 95°C for 3 hours;

[0037] 2) Add hydrofluoric acid into the reactor, and slowly add the lithium fluoride waste after step 1) into the reactor, the mass volume ratio of lithium fluoride waste to hydrofluoric acid is 1:2; the temperature is 30°C, and the reaction is stirred for 30 minutes , until lithium fluoride is completely dissolved;

[0038] 3) Slowly add 106.7kg of calcium chloride solution with a mass concentration of 40% to the solution obtained in step 2), control the reaction temperature at 100°C, and stir for 2 hours; after the reaction is complete, add sodium carbonate to adjust the pH value of the solution to 6; filter and filter cake Calcium fluoride is obtained after washing and drying;

[0039] 4) Co...

Embodiment 2

[0051] A kind of technology that utilizes lithium fluoride waste material to prepare lithium silicate, specifically comprises the following steps:

[0052] 1) Take 10kg of lithium fluoride waste, wash with water and dry to remove attached organic matter, the drying temperature is 100°C, and the drying time is 2h;

[0053] 2) Add hydrofluoric acid into the reactor, and slowly add lithium fluoride waste after the treatment in step 1) into the reactor, the mass volume ratio of lithium fluoride waste to hydrofluoric acid is 1:4; the temperature is 45°C, and the reaction is stirred for 60 minutes , until lithium fluoride is completely dissolved;

[0054] 3) Slowly add 106.7kg of calcium chloride solution with a mass concentration of 40% to the solution obtained in step 2), control the reaction temperature at 110°C, and stir for 1.5 hours; after the reaction is complete, add sodium carbonate to adjust the pH value of the solution to 6.5; filter, filter The cake is washed and dried ...

Embodiment 3

[0063] A kind of technology that utilizes lithium fluoride waste material to prepare lithium silicate, specifically comprises the following steps:

[0064] 1) Take 10kg of lithium fluoride waste, wash with water and dry to remove the attached organic matter, the drying temperature is 90°C, and the drying time is 4h;

[0065] 2) Add hydrofluoric acid into the reactor, and slowly add lithium fluoride waste after step 1) into the reactor, the mass volume ratio of lithium fluoride waste to hydrofluoric acid is 1:5; the temperature is 50°C, and the reaction is stirred for 90 minutes , until lithium fluoride is completely dissolved;

[0066] 3) Slowly add 106.7kg of calcium chloride solution with a mass concentration of 40% to the solution obtained in step 2), control the reaction temperature at 120°C, and stir for 1 hour; after the reaction is complete, add sodium carbonate to adjust the pH value of the solution to 7; filter and filter cake Calcium fluoride is obtained after washi...

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Abstract

The invention belongs to the technical field of inorganic material synthesis, and particularly relates to a process for preparing lithium silicate from lithium fluoride waste. Through a series of reactions, the low-added-value lithium fluoride waste is converted into high-added-value lithium silicate, and the recovery rate of lithium in the lithium fluoride waste reaches 89% or above. It is determined that the aqueous solution obtained by the method is in the modulus 3-5 of the lithium silicate , the prepared lithium silicate has a particle size of about 1 [mu] m and is uniformly dispersed, and the aqueous solution is colorless and transparent in appearance and high in light transmittance. The purity of the dried solid lithium silicate is 99.5%, the purity requirement of a lithium silicateproduct is completely met, and a feasible way is provided for resource utilization of the lithium fluoride waste.

Description

technical field [0001] The invention belongs to the technical field of inorganic material synthesis, and in particular relates to a process for preparing lithium silicate from lithium fluoride waste. Background technique [0002] With the rapid expansion of the global demand for lithium-ion batteries, the production and sales of electrolytes have accelerated growth, and the types and quantities of new lithium salt additives as their main components have also shown rapid growth. With the production and use of new lithium salts, The process produces a large amount of lithium fluoride waste. Due to the difficulty in recycling lithium fluoride waste and the high cost of recycling, general industrial production can only be piled or buried, which not only wastes limited lithium resources, but also causes environmental pollution. [0003] Compared with other alkali metal silicates, lithium silicate has the advantages of low viscosity, good permeability, excellent water resistance,...

Claims

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Application Information

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IPC IPC(8): C01B33/32C01F11/22C01D3/04
CPCC01B33/32C01B33/325C01F11/22C01D3/04C01P2004/61C01P2006/80
Inventor李云峰薛旭金李霞李凌云李亚楠薛峰峰孙永明温丰源
Owner河南省氟基新材料科技有限公司