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Aluminium fluoride trihydrate (AlF3; CAS 7782-41-4) is a colorless, white crystalline compound. It is slightly soluble in water, acids and alkalis. It is insoluble in alcohols and acetone. It can be reacted under heat to form hydrofluoric acid and ammonia.

Uses and Properties

aluminum fluoride trihydrate has a variety of uses in various industries, including ceramics and glass. It is commonly used as a flux for smelting non-ferrous metals, as well as for the production of fluoroaluminate glass. It also inhibits secondary fermentation in alcohol manufacturing, and is a flux for the refining of aluminum scrap.

In the gas phase, it adopts a trigonal molecular structure, which resembles that of zirconium fluoride. Its alpha-carbon atoms have 163 pm bond lengths and are joined to an Al center with distorted octahedra.

It is widely used in the manufacture of fluoroaluminate glass, for example, as a low-index optical thin film. It is also a flux ingredient for the removal of magnesium from aluminum scrap. It can be prepared in a number of ways, including thermal decomposition of ammonium hexafluoroaluminate or by heating aluminium hydroxide and hydrogen fluoride.

The hexafluosilicic acid that this technique utilizes is a by-product of phosphate fertilizer production, and has the advantage of being inexpensive to produce. It is a very useful and adaptable raw material, and it is the primary raw material for this phosphoric acid plant technology. The fluorine that it produces is very high quality, and it also has good market competitiveness.