Synthetic cryolite is a water insoluble Sodium source for use in oxygen-sensitive applications, such as metal production. In extremely low concentrations (ppm), fluoride compounds are used in health applications. Fluoride compounds also have significant uses in synthetic organic chemistry. They are commonly also used to alloy metal and for optical deposition. Certain fluoride compounds can be produced at nanoscale and in ultra high purity forms. Synthetic cryolite is generally immediately available in most volumes. Ultra high purity and high purity compositions improve both optical quality and usefulness as scientific standards. Nanoscale elemental powders and suspensions, as alternative high surface area forms, may be considered. OFC group produces to many standard grades when applicable, including Mil Spec (military grade); ACS, Reagent and Technical Grade; Food, Agricultural and Pharmaceutical Grade; Optical Grade, USP and EP/BP (European Pharmacopoeia/British Pharmacopoeia) and follows applicable ASTM testing standards. Typical and custom packaging is available. Additional technical, research and safety (MSDS) information is available as is a Reference Calculator for converting relevant units of measurement. Technical guidance for using Synthetic cryolite in agriculture is also available.
The production of cryolite at home and abroad mainly has the following processes:
Hydrofluoric acid method: separable dry method and wet method The dry method is to react gaseous hydrofluoric acid at 400-700 ° C with aluminum hydroxide to form fluoroaluminate (H3AlF6), which is then reacted with soda ash at a high temperature. The wet method is prepared by reacting 40 to 60% of hydrofluoric acid with aluminum hydroxide and then adding soda ash.
Fluorosilicic acid method: The ammonium fluoride intermediate product method and the sodium fluorosilicate intermediate product method, and the former is formed by reacting fluorosilicic acid with ammonia water and then reacting with sodium aluminate. The latter is obtained by recovering fluorine-containing waste gas in the production of phosphate fertilizer by recovering sodium fluorosilicate and then performing ammoniacal synthesis.
Carbonation method: cryolite can also be obtained by using carbon dioxide in sodium aluminate and sodium fluoride solution.
Aluminum industry recycling method: Dilute hydrofluoric acid recovered from the waste gas produced by aluminum production can react with sodium aluminate to recover cryolite.
Alkali method: Soda ash, fluorite, silica sand are calcined, pulverized, leached and reacted with aluminum sulfate, which is rarely used in industry.
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