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Preparation method of lithium silicate material with high purity

A lithium silicate, high-purity technology, applied in silicate, alkali metal silicate and other directions, can solve the problems of high synthesis temperature, complex preparation process, expensive equipment, etc., achieve high purity, simple synthesis process, easy The effect of mass production

Inactive Publication Date: 2010-12-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods either have complex preparation processes or expensive equipment, and generally require high synthesis temperatures (>700°C), and the synthesized materials often contain impurity phase Li 2 Si 2 o 5 , Li 4 SiO 4 Wait

Method used

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  • Preparation method of lithium silicate material with high purity
  • Preparation method of lithium silicate material with high purity
  • Preparation method of lithium silicate material with high purity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Ethyl orthosilicate and lithium hydroxide are used as initial raw materials, absolute ethanol is used as a solvent, and 25% ammonia water is used to adjust the pH value of the solution. Add 8 milliliters of ammonia water to 240 milliliters of absolute ethanol, adjust the pH value of the solution to be approximately equal to 8, add 4 milliliters of tetraethyl orthosilicate to the above solution in 4 times and react for 22 hours to prepare suspension A. The lithium source is Li Weigh and Si molar ratio 2:1, dissolve in absolute ethanol, prepare a lithium salt mixture with a concentration of 1.0 mol / L, add the lithium salt mixture dropwise to suspension A, and react for 3 hours to form suspension B. The suspension was dried in an oven at 90°C in an air atmosphere. figure 1 For the high-purity Li synthesized by the improved solution method of the present invention 2 SiO 3 The XRD pattern of the precursor material (without heat treatment, only the material dried after liqu...

Embodiment 2

[0025] Ethyl orthosilicate and lithium carbonate are used as initial raw materials, absolute ethanol is used as a solvent, and 25% ammonia water is used to adjust the pH value of the solution. Add 10 milliliters of ammonia water to 80 milliliters of absolute ethanol, adjust the pH value of the solution to approximately 11, add 4 milliliters of tetraethyl orthosilicate to the above solution in 7 times and react for 4 hours. : 1 weighed, dissolved in absolute ethanol to prepare a lithium salt mixed solution with a concentration of 0.5mol / L, the lithium salt mixed solution was added dropwise into suspension A, and reacted for 1 hour to generate suspension B. The suspension was placed in an oven, dried under vacuum at 120°C. After the obtained solid powder was ground uniformly, it was placed in a muffle furnace, and the temperature was raised to 700°C at a rate of 5°C / min, kept for 0.5 hours, and then naturally cooled to room temperature. Such as image 3 Shown: image 3 It is ...

Embodiment 3

[0027] Ethyl orthosilicate and lithium acetate are used as initial raw materials, absolute ethanol is used as a solvent, and 25% ammonia water is used to adjust the pH value of the solution. Add 8 milliliters of ammonia water to 200 milliliters of absolute ethanol, adjust the pH value of the solution to approximately 9, add 4 milliliters of tetraethyl orthosilicate to the above solution in 5 times and react for 10 hours to prepare suspension A. The lithium source is Li Weigh and Si molar ratio 2:1, dissolve in absolute ethanol, prepare a lithium salt mixture with a concentration of 2.0mol / L, add the lithium salt mixture dropwise to suspension A, and react for 2 hours to form suspension B. The suspension was dried in an oven at 100°C in an air atmosphere. After the obtained solid powder was ground evenly, it was placed in an argon atmosphere furnace, and the temperature was raised to 250° C. at a rate of 20° C. / min, kept for 3 hours, and then naturally cooled to room temperatur...

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Abstract

The invention provides a preparation method of a lithium silicate material with high purity, which comprises the steps of: firstly, mixing absolute ethyl alcohol and ammonia water into a mixed solution with pH of 8-11, adding tetraethoxysilane into the mixed solution of the ammonia water and the absolute ethyl alcohol step by step according to the proportion of the tetraethoxysilane to the absolute ethyl alcohol of 1:15-1:60 in volume ratio, and stirring to obtain liquid A; then weighing a lithium source according to the mol ratio of Li:Si of 2:1, dissolving into the absolute ethyl alcohol, adding a prepared lithium salt mixed solution into the mixed solution A to generate a suspension solution B; and drying the suspension solution B and then placing into a high temperature furnace for heat treatment, and cooling the dried suspension solution B to the room temperature with the furnace to obtain the lithium silicate material with high purity. The method has the advantages of simple process, low synthesis temperature and low cost; and the synthesized lithium silicate powder has uniform and thin powder particle, better crystallinity and no impurity phase and is a higher-purity lithium silicate material. The lithium silicate (LiSiO3) material can be used for the fields of a coating material, a lithium battery raw material, a breeder reactor material, and the like.

Description

technical field [0001] The invention relates to a method for preparing high-purity lithium silicate materials used in coating materials, breeder reactor materials, etc., and provides a method for preparing Li 2 SiO 3 new approach to materials. technical background [0002] Lithium silicate (Li 2 SiO 3 ) has been intensively studied as an important inorganic compound with a wide range of applications. As a coating base material, lithium silicate can be used in inorganic architectural coatings due to its good heat resistance, non-combustibility, radiation resistance, abrasion resistance, moisture resistance, water resistance, weather resistance, light resistance, pollution resistance and environmental friendliness. Layer materials, such as: offshore engineering, oil pipelines, ships, bridges and architectural coatings (Wu Bo. Research on Lithium Silicate Inorganic Zinc-rich Coating Curing Agent, Applied Science and Technology, 2009, 36(8): 1-3) is especially suitable for u...

Claims

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Application Information

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IPC IPC(8): C01B33/32
Inventor 赵海雷王静王春梅王捷
Owner UNIV OF SCI & TECH BEIJING
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