High-purity calcium fluoride, and preparation method and application thereof
By strictly controlling the reaction conditions and purification process under an inert atmosphere, high-purity calcium fluoride was prepared, solving the problems of insufficient purity and transmittance in existing technologies, and realizing the preparation of high-purity calcium fluoride suitable for optical devices.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HENAN FLUORINE BASED NEW MATERIAL TECH CO LTD
- Filing Date
- 2026-05-12
- Publication Date
- 2026-07-17
AI Technical Summary
Existing technologies make it difficult to prepare high-purity, high-transmittance calcium fluoride crystals, especially optical-grade CaF2 single crystals/powders. Impurity elements such as oxygen and metal ions affect their optical properties, and existing methods cannot meet the 4-5N level requirements in terms of purity and transmittance.
High-purity calcium chloride and potassium fluoride are used as raw materials. The reaction is carried out in an inert atmosphere through dissolution, recrystallization and dropwise addition. The reaction conditions, including temperature, concentration and atmosphere, are strictly controlled. Impurities are removed by multiple filtrations and drying to prepare high-purity calcium fluoride.
The high-purity calcium fluoride prepared has a purity of over 99.99%, an oxygen content of less than 200 ppm, and a uniform particle size distribution, meeting the requirements of optical devices. It is also safe to operate and easy to industrialize.
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Abstract
Citation Information
Patent Citations
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